Preparation and application of polar pentadiene-styrene copolymer resin with constant composition

Abstract

The invention relates to preparation and application of polar m-pentadiene-styrene copolymer resin with constant composition. The copolymer resin comprises a structural unit A and a structural unit B, the structural unit A has at least one of structures shown in a formula (1) and / or a formula (2); and the structural unit B has a structure as shown in a formula (3). The copolymer is prepared through an active anionic copolymerization method, constant regulation and control of components of the styrene monomer and the pentadiene monomer are achieved through the controllable regulation function of the in-situ functionalized monomer, and the copolymer has wide application in the fields of transparent anti-impact resin, resin flexibilizers and the like. And # imgabs0 #.

Description

Technical Field

[0001] The invention relates to the field of synthetic resins, and in particular to the preparation and application of a polar isoprene-styrene copolymer resin with a constant composition and a high-impact polymer material. Background Art

[0002] At present, the copolymer sequence of diene-styrene can be adjusted by solvent, regulator, monomer type, temperature and feeding method, and can be used to synthesize block (including strict block and quasi-block sequence), random (including gradient and highly random sequence) and alternating copolymers. Among them, the synthesis of (SmD)n (m>1) copolymers with constant composition is extremely difficult, mainly due to the following reasons: (1) The copolymerization activity of conventional diene monomers (such as butadiene and isoprene) is very high. r D Much higher than styrene monomers (such as styrene, methyl styrene and tert-butyl styrene) r S ; (2) Although sequential copolymers with constant composition can be obtained by randomizing reagents (such as potassium tert-butoxide and sodium dodecyl sulfate) or by continuous constant ratio monomer feeding method, they can only tend to synthesize (DmS)n (m>1) sequential copolymers; (3) Theoretically, the controllable preparation of (SmD)n (m>1) copolymers can be achieved through molecular scale microfluidic technology, but it is still difficult to industrialize industrial production.

[0003] Isopentylene (P) is a special type of conjugated diene. Its activity in anionic homopolymerization is much lower than that of styrene monomers, but it tends to form alternating copolymer sequences during copolymerization ( r S• r P ≈0), while styrene monomers are reacted with THF or a strong polar modifier r S >> r P .Using this special property and the role of weak polar regulators in anionic polymerization, the controllable preparation of (SmD)n (m>1) copolymers with constant composition can be achieved. Common tertiary amine regulators (such as triethylamine) have a weaker regulatory effect and can be used to prepare constant composition sequence copolymers with high styrene content. If tertiary amine functional groups are grafted into the polymer chain, the purpose of regulating the reactivity ratio of the comonomer can also be achieved in theory.

[0004] The research on polarization of diene-styrene copolymers synthesized by anionic polymerization methods mainly focuses on post-functionalization modification (such as epoxidation modification, hydrogenation and cyclization modification) and in-situ polymerization modification (end-capping modification and functional group monomer copolymerization). Among them, functional group monomer copolymerization has the characteristics of easy industrialization, simple operation and fixed-point and quantitative functionalization, but it also has the following problems: (1) The active controlled polymerization of most polar functional monomers requires ultra-low temperature conditions, which is difficult to achieve industrialization; (2) Most polar functional monomers are prone to side reactions during the copolymerization process, resulting in certain defects in the product structure design; (3) The introduction of most polar functional monomers will greatly reduce the linear structure of polydiene, thereby reducing the elasticity of the product; (4) Although DPE-type polar functional groups can achieve fixed-point and quantitative modification of diene-styrene copolymer sequences, the industrialization cost of this type of monomer is relatively high. Summary of the invention

[0005] In view of this, the purpose of the present invention is to overcome the problem that the prior art has a large difficulty in regulating the sequence of diene-styrene copolymerization and it is difficult to synthesize polar copolymers with a high styrene content and a constant composition, and to provide a type of preparation and application of polar isoprene-styrene copolymer resins with a constant composition. The copolymer resin provided by the present invention can be prepared by an active anion copolymerization method, and the controllable regulation function of the in-situ functionalized monomer itself is used to achieve constant regulation of the components of styrene monomers and isoprene monomers, and has a wide range of uses in the fields of transparent impact-resistant resins and resin toughening agents.

[0006] The first aspect of the present invention provides a type of polar isoprene-styrene copolymer resin with a constant composition, characterized in that the copolymer resin comprises a structural unit A and a structural unit B; the structural unit A has at least one of the structures shown in formula (1) and / or formula (2); the structural unit B has a structure shown in formula (3):

[0007] Wherein, R1 is H or a C1-C10 alkyl substituent, R2 is a C1-C16 straight chain alkyl or a C1-C16 branched chain alkyl or a C4-C10 cycloalkyl or a C6-C10 aromatic group, and m = 1-10. Further, R1 is H or a C1-C4 alkyl substituent, R2 is a C1-C8 straight chain alkyl or a C1-C10 branched chain alkyl or a C5-C8 cycloalkyl or a C6-C8 aromatic group, and m = 1-8.

[0008] The polar isoprene-styrene copolymer resin with constant composition provided by the present invention is characterized in that the structural units A and B are arranged in a random sequence, an alternating sequence or a gradual sequence. Further, the structural units A and B are arranged in a random sequence or an alternating sequence.

[0009] The polar isoprene-styrene copolymer resin with a constant composition provided by the present invention is characterized in that, based on the total molar number of the copolymer described, the molar content of the structural unit A is 65-99.9%, the molar content of the structural unit B is 0.1-35%, and the proportion of the formula (1) in the structural unit A is 80-95%. Further, based on the total molar number of the copolymer described, the molar content of the structural unit A is 75-99.5%, the molar content of the structural unit B is 0.5-25%, and the proportion of the formula (1) in the structural unit A is 85-92%.

[0010] The second aspect of the present invention provides a method for preparing a polar piperyl-styrene copolymer resin having a constant composition, characterized in that the preparation method comprises:

[0011] In an anhydrous and oxygen-free inert gas atmosphere, styrene monomers, isoprene monomers, and tertiary amine functional monomers are added to an inert aprotic solvent, and alkyl lithium is added at 0-100 ° C to initiate a polymerization reaction. After reacting for 0.5-6 hours, the reaction is terminated with methanol, and the solvent is removed to obtain an isoprene-styrene copolymer resin with a constant composition; preferably, the inert aprotic solvent is selected from one or more of cyclohexane, cyclopentane, benzene, toluene, hexane, and pentane; further, the inert aprotic solvent is selected from one or more of cyclohexane, cyclopentane, and hexane; preferably, the tertiary amine functional monomer is selected from at least one of SN-1 to SN-8 (including ortho, meta, and para isomers); further, the tertiary amine functional monomer is selected from at least one of SN-1, SN-2, SN-3, SN-6, and SN-7 (including ortho, meta, and para isomers):

[0012] Preferably, the alkyl lithium is selected from at least one of monolithium, dilithium and polylithium; further, the alkyl lithium is selected from at least one of n-butyl lithium, sec-butyl lithium, tert-butyl lithium, diisopropyl lithium amide and cycloheximide lithium.

[0013] The polar isopentadiene-styrene copolymer resin provided by the present invention is characterized in that the styrene monomer is selected from one or more of styrene, methyl styrene, ethyl styrene, isopropyl styrene, n-butyl styrene, isobutyl styrene, p-tert-butyl styrene, acryl styrene and allyl styrene (including o-, m- and p-isomers), and vinyl benzocyclobutene; further, preferably one or more of styrene, methyl styrene, p-tert-butyl styrene, allyl styrene and vinyl benzocyclobutene (including o-, m- and p-isomers).

[0014] The polar piperylene-styrene copolymer resin provided by the present invention is characterized in that the piperylene comprises one or more of cis-piperylene, trans-piperylene and a mixed isomer of cis-trans piperylene; further, a mixed isomer of cis-trans piperylene is preferred.

[0015] The polar isoprene-styrene copolymer resin provided by the present invention is characterized in that the number average molecular weight of the polymer is 10000-1000000 g / mol and the molecular weight distribution is 1.02-1.30. Furthermore, preferably, the number average molecular weight of the polymer is 20000-500000 g / mol and the molecular weight distribution is 1.05-1.25.

[0016] The third aspect of the present invention provides the use of the polar isoprene-styrene copolymer resin as a toughening agent.

[0017] The fourth aspect of the present invention provides the polar isoprene-styrene copolymer resin for toughening at least one of general-purpose PS, ABS, and PVC.

[0018] The fifth aspect of the present invention provides a high-impact polymer material, characterized in that the high-impact polymer material comprises the above-mentioned polar isoprene-styrene copolymer resin and a polymer material. Preferably, relative to 100 parts of the polymer material as a benchmark, the amount of the polar isoprene-styrene copolymer resin is 1-20 parts; preferably, the polymer material is selected from at least one of PS, ABS, and PVC.

[0019] Through the above technical scheme, the preparation and application of the polar isoprene-styrene copolymer resin with a constant composition provided by the present invention, the high-impact polymer material obtains the following beneficial effects:

[0020] The polar isoprene-styrene copolymer resin provided by the present invention comprises isoprene monomer and styrene monomer to form a polymer main frame, and realizes quantitative and positional introduction of tertiary amine side functional groups by an in-situ copolymerization method of tertiary amine monomers. Meanwhile, the introduced in-situ functionalized monomers themselves have a regulator function, which is conducive to realizing constant regulation of the components of styrene monomers and isoprene monomers. The polar isoprene-styrene copolymer resin has a wide range of uses in the fields of transparent impact-resistant resins and resin toughening agents, and is used as a toughening agent for PS / ABS / PVC general plastics.

[0021] The present invention will be described in detail below through examples.

[0022] The diene microstructure, styrene monomer and isoprene monomer composition, and functionalized monomer content in the sample were determined by NMR; the sample molecular weight and its distribution were determined by GPC. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The H-NMR spectra (A) and copolymer composition distribution diagram (B) of copolymers with different conversion rates at a feed ratio of styrene / isopentadiene = 80 / 20.

[0024] Figure 2 These are the 1H NMR spectra (A, C, E) of the styrene / isopentadiene / vinylbenzyldimethylamine styrene ternary copolymerization system at different conversion rates and the corresponding component content-conversion rate relationship diagrams (B, D, F). DETAILED DESCRIPTION

[0025] Embodiment 1:

[0026] A 5 L anhydrous and oxygen-free reactor was filled with high-purity nitrogen, and 2500 mL of cyclohexane, 10 mL of 0.3 M THF regulator and 10 mL of 0.3 M n-butyl lithium initiator were added in sequence. The mixed solution was stirred at 50 °C for 1 min, and then 60 g of isomers of isoprene and 240 g of styrene were added. The polymerization reaction was carried out at 60-70 °C for 0.5 h, and 1 mL of methanol solution was added to terminate the reaction. A 0.1% antioxidant (ethanol solution of 2,6-di-tert-butyl-4-methylphenol) solution was added to the above styrene-isopentadiene copolymer solution, and the gel was boiled with high-temperature steam to wash out the polymer. The obtained polymer was dried in a vacuum drying oven to obtain a polymer with a yield of 100%. The content of polyisopentadiene in the polymer was 19.8%, 1,4-structure was 92%, the molecular weight was 99500 g / mol, and the molecular weight distribution was 1.03. Online NMR sequencing showed that styrene and isoprene exhibited a gradual random copolymerization sequence.

[0027] Embodiment 2:

[0028] A 5 L anhydrous and oxygen-free reactor was filled with high-purity nitrogen, and 2500 mL of cyclohexane and 10 mL of 0.3 M n-butyl lithium initiator were added in sequence. The mixed solution was stirred at 50 °C for 2 min, and then 57 g of cis-isopentadiene, 228 g of styrene and 15 g of SN-1 monomer were added. The polymerization reaction was carried out at 60-70 °C for 1 h, and 1 mL of methanol solution was added to terminate the reaction. A 0.1% antioxidant (ethanol solution of 2,6-di-tert-butyl-4-methylphenol) solution was added to the above styrene-isopentadiene-SN-1 copolymer solution, and the gel was boiled with high-temperature steam to wash out the polymer. The obtained polymer was dried in a vacuum drying oven to obtain a polymer with a yield of 100%. The polystyrene content of the polymer was 76.2%, the polyisopentadiene content was 18.8%, the 1,4-structure was 89%, the SN-1 content was 5%, the molecular weight was 102500 g / mol, and the molecular weight distribution was 1.05. Online NMR sequencing showed that the ternary copolymer system presented a constant composition sequence pattern.

[0029] Embodiment 3:

[0030] A 5 L anhydrous and oxygen-free reactor was filled with high-purity nitrogen, and 2500 mL of cyclohexane and 10 mL of 0.3 M n-butyl lithium initiator were added in sequence. The mixed solution was stirred at 50 °C for 2 min, and then 54 g of isomers of isobutylene, 216 g of styrene and 30 g of SN-1 monomer were added. The polymerization reaction was carried out at 60-70 °C for 1 h, and 1 mL of methanol solution was added to terminate the reaction. A 0.1% antioxidant (ethanol solution of 2,6-di-tert-butyl-4-methylphenol) solution was added to the above styrene-isobutylene-SN-1 copolymer solution, and the gel was boiled with high-temperature steam to wash out the polymer. The obtained polymer was dried in a vacuum drying oven to obtain a polymer with a yield of 100%. The polystyrene content of the polymer was 71.5%, the polyisobutylene content was 18.2%, the 1,4-structure was 89%, the SN-1 content was 10.3%, the molecular weight was 112300 g / mol, and the molecular weight distribution was 1.09. Online NMR sequencing showed that the ternary copolymer system presented a constant composition sequence pattern.

[0031] Embodiment 4:

[0032] A 5 L anhydrous and oxygen-free reactor was filled with high-purity nitrogen, and 2500 mL of cyclohexane and 10 mL of 0.3 M n-butyl lithium initiator were added in sequence. The mixed solution was stirred at 50 °C for 2 min, and then 48 g of isomers of isobutylene, 192 g of styrene and 60 g of SN-1 monomer were added. The polymerization reaction was carried out at 60-70 °C for 1 h, and 1 mL of methanol solution was added to terminate the reaction. A 0.1% antioxidant (ethanol solution of 2,6-di-tert-butyl-4-methylphenol) solution was added to the above styrene-isobutylene-SN-1 copolymer solution, and the gel was boiled with high-temperature steam to wash out the polymer. The obtained polymer was dried in a vacuum drying oven to obtain a polymer with a yield of 100%. The polystyrene content of the polymer was 63.7%, the polyisobutylene content was 16.2%, the 1,4-structure was 88%, the SN-1 content was 20.1%, the molecular weight was 132800 g / mol, and the molecular weight distribution was 1.19. Online NMR sequencing showed that the ternary copolymer system presented a constant composition sequence pattern.

[0033] Embodiment 5:

[0034] A 5 L anhydrous and oxygen-free reactor was filled with high-purity nitrogen, and 2500 mL of cyclohexane and 10 mL of 0.3 M n-butyl lithium initiator were added in sequence. The mixed solution was stirred at 50 °C for 2 min, and then 57 g of isomers of isobutylene, 228 g of p-methylstyrene and 15 g of SN-2 monomer were added. The polymerization reaction was carried out at 60-70 °C for 1 h, and 1 mL of methanol solution was added to terminate the reaction. A 0.1% antioxidant (ethanol solution of 2,6-di-tert-butyl-4-methylphenol) solution was added to the p-methylstyrene-isobutylene-SN-2 copolymer solution, and the gel was boiled with high-temperature steam to wash out the polymer. The obtained polymer was dried in a vacuum drying oven to obtain a polymer with a yield of 100%. The content of polymethylstyrene, polyisobutylene, 18.7%, 1,4-structure, SN-2, molecular weight, molecular weight distribution, was 111400 g / mol, and molecular weight distribution was 1.06. Online NMR sequencing showed that the ternary copolymer system presented a constant composition sequence pattern.

[0035] Embodiment 6:

[0036] A 5 L anhydrous and oxygen-free reactor was filled with high-purity nitrogen, and 2500 mL of cyclohexane and 10 mL of 0.3 M n-butyl lithium initiator were added in sequence. The mixed solution was stirred at 50 °C for 2 min, and then 57 g of isomers of isobutylene, 228 g of p-tert-butylstyrene and 15 g of SN-3 monomer were added. The polymerization reaction was carried out at 60-70 °C for 1 h, and 1 mL of methanol solution was added to terminate the reaction. A 0.1% antioxidant (ethanol solution of 2,6-di-tert-butyl-4-methylphenol) solution was added to the above p-tert-butylstyrene-isobutylene-SN-3 copolymer solution, and the gel was boiled with high-temperature steam to wash out the polymer. The obtained polymer was dried in a vacuum drying oven to obtain a polymer with a yield of 100%. The polymer contained 76.5% poly-tert-butylstyrene, 18.7% polyisoprene, 91% 1,4-structure, 4.8% SN-3, 109500 g / mol, and a molecular weight distribution of 1.05. Online NMR sequencing showed that the ternary copolymer system presented a constant composition sequence pattern.

[0037] Embodiment 7:

[0038] A 5 L anhydrous and oxygen-free reactor was filled with high-purity nitrogen, and 2500 mL of cyclohexane and 10 mL of 0.3 M n-butyl lithium initiator were added in sequence. The mixed solution was stirred at 50 °C for 2 min, and then 57 g of isomers of isopentylene, 228 g of vinyl benzocyclobutene and 15 g of SN-4 monomer were added. The polymerization reaction was carried out at 60-70 °C for 1 h, and 1 mL of methanol solution was added to terminate the reaction. A 0.1% antioxidant (ethanol solution of 2,6-di-tert-butyl-4-methylphenol) solution was added to the above-mentioned vinyl benzocyclobutene-isopentylene-SN-4 copolymer solution, and the gel was boiled with high-temperature steam to wash out the polymer. The obtained polymer was dried in a vacuum drying oven to obtain a polymer with a yield of 100%. The content of polyvinylbenzocyclobutene in the polymer is 76.4%, the content of polyisoprene is 18.9%, the 1,4-structure is 90%, the content of SN-4 is 4.7%, the molecular weight is 123400 g / mol, and the molecular weight distribution is 1.09. Online nuclear magnetic resonance sequencing shows that the ternary copolymer system presents a constant composition sequence pattern.

[0039] Embodiment 8:

[0040] A 5 L anhydrous and oxygen-free reactor was filled with high-purity nitrogen, and 2500 mL of cyclopentane and 10 mL of 0.3 M tert-butyl lithium initiator were added in sequence. The mixed solution was stirred at 50 °C for 2 min, and then 54 g of trans-isopentadiene, 216 g of p-tert-butylstyrene and 30 g of SN-3 monomer were added. The polymerization reaction was carried out at 60-70 °C for 1 h, and 1 mL of methanol solution was added to terminate the reaction. A 0.1% antioxidant (ethanol solution of 2,6-di-tert-butyl-4-methylphenol) solution was added to the above p-tert-butylstyrene-isopentadiene-SN-5 copolymer solution, and the gel was boiled with high-temperature steam to wash out the polymer. The obtained polymer was dried in a vacuum drying oven to obtain a polymer with a yield of 100%. The polymer contained 72.3% poly-tert-butylstyrene, 18.0% polyisoprene, 91% 1,4-structure, 4.7% SN-5, 123500 g / mol, and a molecular weight distribution of 1.05. Online NMR sequencing showed that the ternary copolymer system presented a constant composition sequence pattern.

[0041] Embodiment 9:

[0042] A 5 L anhydrous and oxygen-free reactor was filled with high-purity nitrogen, and 2500 mL of cyclopentane and 10 mL of 0.3 M sec-butyl lithium initiator were added in sequence. The mixed solution was stirred at 50 °C for 2 min, and then 48 g of isomers of isobutylene, 192 g of p-methylstyrene and 60 g of SN-6 monomer were added. The polymerization reaction was carried out at 60-70 °C for 1 h, and 1 mL of methanol solution was added to terminate the reaction. A 0.1% antioxidant (ethanol solution of 2,6-di-tert-butyl-4-methylphenol) solution was added to the p-methylstyrene-isobutylene-SN-6 copolymer solution, and the gel was boiled with high-temperature steam to wash out the polymer. The obtained polymer was dried in a vacuum drying oven to obtain a polymer with a yield of 100%. The content of polymethylstyrene, polyisobutylene, 15.9%, 1,4-structure, SN-6, molecular weight, molecular weight, and molecular weight distribution were 103600 g / mol, respectively. Online NMR sequencing showed that the ternary copolymer system presented a constant composition sequence pattern.

[0043] Embodiment 10:

[0044] A 5 L anhydrous and oxygen-free reactor was filled with high-purity nitrogen, and 2500 mL of cyclopentane and 10 mL of 0.3 M sec-butyl lithium initiator were added in sequence. The mixed solution was stirred at 50 °C for 2 min, and then 45 g of isomers of isobutylene, 180 g of styrene and 75 g of SN-6 monomer were added. The polymerization reaction was carried out at 60-70 °C for 1 h, and 1 mL of methanol solution was added to terminate the reaction. A 0.1% antioxidant (ethanol solution of 2,6-di-tert-butyl-4-methylphenol) solution was added to the above styrene-isobutylene-SN-7 copolymer solution, and the gel was boiled with high-temperature steam to wash out the polymer. The obtained polymer was dried in a vacuum drying oven to obtain a polymer with a yield of 100%. The polystyrene content of the polymer was 60.0%, the polyisobutylene content was 15.2%, the 1,4-structure was 92%, the SN-7 content was 24.8%, the molecular weight was 111600 g / mol, and the molecular weight distribution was 1.08. Online NMR sequencing showed that the ternary copolymer system presented a constant composition sequence pattern.

[0045] Embodiment 11:

[0046] A 5 L anhydrous and oxygen-free reactor was filled with high-purity nitrogen, and 2500 mL of cyclohexane and 10 mL of 0.3 M tert-butyl lithium initiator were added thereto in sequence. The mixed solution was stirred at 50 °C for 2 min, and then 45 g of isomers of isobutylene, 180 g of p-tert-butylstyrene and 75 g of SN-8 monomer were added. The polymerization reaction was carried out at 60-70 °C for 1 h, and 1 mL of methanol solution was added to terminate the reaction. A 0.1% antioxidant (ethanol solution of 2,6-di-tert-butyl-4-methylphenol) solution was added to the p-tert-butylstyrene-p-butylene-SN-8 copolymer solution, and the gel was boiled with high-temperature steam to wash out the polymer. The obtained polymer was dried in a vacuum drying oven to obtain a polymer with a yield of 100%. The polymer contains 60.4% poly(p-tert-butylstyrene), 14.5% poly(isoprene), 90% 1,4-structure, 25.1% SN-8, 115900 g / mol, and a molecular weight distribution of 1.19. Online NMR sequencing shows that the ternary copolymer system presents a constant composition sequence pattern.

[0047] Impact performance test method:

[0048] (1) Using a laboratory small twin-screw extruder, the terpolymer and PS resin were mixed at a ratio of 30:70 and extruded into granules to prepare a 10% mass fraction standard product.

[0049] (2) The required standard sheet was obtained by extrusion molding at 200 °C and 20 MPa, and used as an 80 mm × 10 mm × 4 mm long strip sample for analysis and testing.

[0050] (3) Test the impact strength of the above samples on an XCJ-50 impact testing machine (J / cm) 2 .

[0051] (4) Measure five times and take the average value. The experimental data is recorded in the table below.

[0052] sample <![CDATA[Impact strength J / cm 2 > Blank-PS 7 Example 1-30%-PS 25 Example 2-30%-PS 35 Example 3-30%-PS 45 Example 4-30%-PS 37 Example 5-30%-PS 50 Example 6-30%-PS 46 Example 7-30%-PS 49 Example 8-30%-PS 40 Example 9-30%-PS 59 Example 10-30%-PS 44 Example 11-30%-PS 60

[0053] It can be seen from the data in the table that by blending the styrene-isopentadiene multipolymer of the present invention with PS to prepare the new impact-resistant polystyrene material, a highly efficient impact-resistant effect can be obtained after adding it.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the implementation process and features of the present invention, rather than to limit the technical methods of the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field should understand that the present invention can still be modified or replaced by equivalents, and any modification or partial replacement that does not depart from the spirit and scope of the present invention should be covered by the protection scope of the present invention.

Claims

1. A polar piperyl-styrene copolymer resin having a constant composition, characterized in that: The copolymer resin comprises a structural unit A and a structural unit B; the structural unit A has at least one of the structures shown in formula (1) and / or formula (2); and the structural unit B has the structure shown in formula (3): Wherein, R1 is H or a C1-C10 alkyl substituent, R2 is a C1-C16 straight chain alkyl or a C1-C16 branched chain alkyl or a C4-C10 cycloalkyl or a C6-C10 aromatic group, and m=1-10.

2. The polar isoprene-styrene copolymer resin with a constant composition according to claim 1, characterized in that: The structural units A and B are arranged in a random sequence, an alternating sequence or a gradient sequence.

3. The polar piperyl-styrene copolymer resin with a constant composition according to claim 1 or 2, wherein: Based on the total molar number of the copolymer described, the molar content of the structural unit A is 65-99.9%, and the molar content of the structural unit B is 0.1-35%, wherein the proportion of the formula (1) in the structural unit A is 80-95%.

4. A method for preparing a polar piperyl-styrene copolymer resin having a constant composition, characterized in that: The preparation method comprises: In an anhydrous and oxygen-free inert gas atmosphere, styrene monomers, isoprene monomers, and tertiary amine functional monomers are added to an inert aprotic solvent, alkyl lithium is added at 0-100 ° C to initiate polymerization, the reaction is terminated with methanol after 0.5-6 hours, and the solvent is removed to obtain an isoprene-styrene copolymer resin with a constant composition; preferably, the inert aprotic solvent is selected from one or more of cyclohexane, cyclopentane, benzene, toluene, hexane, and pentane; preferably, the tertiary amine functional monomer is selected from at least one of SN-1 to SN-8 (including ortho, meta, and para isomers); Preferably, the alkyl lithium is selected from at least one of monolithium, dilithium and polylithium.

5. The polar piperyl-styrene copolymer resin according to any one of claims 1 to 4, characterized in that: The styrene monomer is selected from one or more of styrene, methyl styrene, ethyl styrene, isopropyl styrene, n-butyl styrene, isobutyl styrene, p-tert-butyl styrene, acryl styrene and allyl styrene (including ortho-, meta- and para-isomers).

6. The polar piperyl-styrene copolymer resin according to any one of claims 1 to 5, characterized in that: The piperylene includes one or more of cis-piperylene, trans-piperylene and mixed isomers of cis-trans-piperylene.

7. The polar piperyl-styrene copolymer resin according to any one of claims 1 to 6, characterized in that: The number average molecular weight of the polymer is 10000-1000000 g / mol; and the molecular weight distribution is 1.02-1.

30.

8. Use of the polar piperyl-styrene copolymer resin according to any one of claims 1 to 7 as a toughening agent.

9. The polar isopentadiene-styrene copolymer resin according to any one of claims 1 to 7 is used to toughen at least one of general-purpose PS, ABS, and PVC.

10. A high impact polymer material, characterized in that: The high impact polymer material comprises the polar isoprene-styrene copolymer resin and polymer material as described in any one of claims 1 to 7. Preferably, the polar isoprene-styrene copolymer resin is used in an amount of 1 to 20 parts relative to 100 parts of the polymer material; preferably, the polymer material is selected from at least one of PS, ABS, and PVC.

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