A functionalized polyolefin
By introducing CON bonds and imide-structured polar functional groups into the polyolefin molecular chain, the problem of introducing diverse polar functional groups into polyolefins in the prior art has been solved, realizing functionalized polyolefins with reduced melting point and maintained molecular weight, thus expanding their application potential.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHAIN WALK NEW MATERIAL TECH (GUANGZHOU) CO LTD
- Filing Date
- 2026-04-24
- Publication Date
- 2026-06-23
AI Technical Summary
Existing technologies struggle to selectively introduce diverse polar functional groups into polyolefin molecular chains while maintaining the excellent bulk properties of polyolefins. Furthermore, existing modification methods suffer from problems such as difficulty in reaction control, low efficiency, and poor compatibility.
By introducing CON bonds into the polyolefin molecular chain and grafting polar functional groups containing imide structures, functionalized polyolefins are prepared by reacting high-valent iodine compounds and graft monomers on the polyolefin, achieving functionalization of polar functional groups while maintaining the original structure of the polyolefin.
The introduction of diverse polar functional groups has been achieved, which has lowered the melting point while maintaining the molecular weight and mechanical properties of polyolefins, thus providing a wider range of possibilities for functional applications.
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Figure CN122255332A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of polymer modification technology, and particularly relates to a functionalized polyolefin. Background Technology
[0002] Polyolefin materials, mainly including polyethylene (PE) and polypropylene (PP), are the most widely produced and used synthetic polymer materials globally. Their main chain consists of saturated carbon-carbon and carbon-hydrogen bonds. This non-polar chemical structure endows polyolefins with excellent chemical stability, low density, good processability, and recyclability, making them a cornerstone material in packaging, films, automobiles, electrical appliances, and daily necessities. However, this chemical inertness also becomes a major obstacle to further performance improvement and functional applications. Polyolefins have low surface energy and poor compatibility with polar materials (such as fillers, coatings, and adhesives), making it difficult to prepare high-performance composite materials. At the same time, the lack of active functional groups also limits the possibility of endowing materials with specific functions through chemical modification.
[0003] To overcome these limitations, traditional methods mainly include copolymerization modification, surface treatment, and additive modification. However, these technical approaches all have significant bottlenecks. Copolymerization modification often results in the poisoning and deactivation of highly efficient catalysts due to polar monomers, making the reaction process complex and costly. Surface treatment techniques (such as corona or plasma treatment) can improve surface properties, but the modified layer is shallow and the effect decays over time, failing to achieve bulk functionalization of the material. Simple physical blending modification faces the fundamental problem of poor compatibility between polar additives and non-polar LDPE matrix, often at the expense of the material's mechanical properties.
[0004] Against this backdrop, post-functionalization modification technology, which involves grafting functional groups onto synthesized polyolefin macromolecular chains through subsequent reactions, is considered a highly promising solution. However, existing technical solutions in this field are far from mature. For example, the widely studied free radical grafting method is difficult to control precisely during the reaction process, easily inducing cross-linking of polymer chains (leading to gel formation) or degradation (leading to a decrease in molecular weight), thus destroying the inherent excellent properties of LDPE. Other physical or chemical treatment methods are often limited by problems such as low reaction efficiency, limited functional group types, or poor modification uniformity, making it difficult to achieve large-scale, controllable modification in industrial production.
[0005] Therefore, how to selectively introduce diverse polar functional groups into polyolefin molecular chains while maximizing the preservation of their excellent bulk properties is a technical problem that urgently needs to be solved in this field. Summary of the Invention
[0006] Based on the defects and shortcomings of the existing technology, the present invention aims to provide a functionalized polyolefin. This functionalized polyolefin introduces polar functional groups containing imide structures into the main chain through CON bonds. The types of polar functional groups are diverse. Moreover, the functionalized polyolefin has a lower melting point and a molecular weight that is not significantly reduced compared to the unfunctionalized polyolefin. That is, the polar functional groups are functionalized while maintaining the original structure of the polyolefin to the maximum extent, and the effect of lowering the melting point is obtained.
[0007] In this invention, the functionalized polyolefin has the structural formula shown in formula (Ⅰ):
[0008] Equation (Ⅰ);
[0009] Wherein, R is selected from at least one of the following formulas (II) and (III);
[0010] Equation (II);
[0011] Formula (Ⅲ);
[0012] Furthermore, R1, R2, R3, R4, R5, and R6 in the formula are each independently at least one of hydrogen atom, methyl, ethyl, tert-butyl, carboxyl, methoxy, cyano, aldehyde, halogen, hydroxyl, and amino.
[0013] In actual production, R1, R2, R3, R4, R5, and R6 can be selected based on the performance requirements of the corresponding functionalized polyolefins. For example, based on further reaction requirements, at least one of R1, R2, R3, R4, R5, and R6 can be selected as carboxyl, amino, etc. It should be understood that these selections are not limited in any way in this invention.
[0014] In some embodiments of the present invention, the weight-average molecular weight of the functionalized polyolefin is 40~200 Kg / mol.
[0015] In some embodiments of the present invention, the weight-average molecular weight of the functionalized polyolefin is more than 20% of the weight-average molecular weight of the polyolefin used as the raw material for preparing the functionalized polyolefin, preferably 20% to 90%, more preferably 40% to 90%, even more preferably 70% to 90%, and most preferably 80% to 90%.
[0016] In some embodiments of the present invention, the percentage of repeating structural units containing the R group relative to the total number of repeating structural units of the functionalized polyolefin is 1 to 15 mol%, for example, it can be 1.5 mol%, 2 mol%, 3 mol%, 4 mol%, 5 mol%, 6 mol%, 7 mol%, 8 mol%, 9 mol%, 10 mol%, 11 mol%, 12 mol%, 13 mol%, or 14 mol%.
[0017] In some embodiments of the present invention, the raw materials for preparation include polyolefins, high-valent iodine compounds, and grafted monomers.
[0018] In some embodiments of the present invention, the monomers for preparing the polyolefin include at least one selected from ethylene, propylene, styrene, 1-butene, 1-hexene, 1-octene, and butadiene.
[0019] In some embodiments of the present invention, the grafting monomer is selected from at least one of N-hydroxyphthalimide and its derivatives, and N-hydroxysuccinimide and its derivatives.
[0020] In some embodiments of the present invention, the high-valent iodine compound is selected from at least one of iodic acid, iodophenyl diacetic acid, dichloroiodobenzene, 2-iodoacylbenzoic acid, Desmond-Martin reagent, bis(trifluoroacetoxy)iodobenzene, [hydroxy(toluenesulfonyloxy)iodo]benzene, and aryliodobis(carboxylate).
[0021] In some embodiments of the present invention, the ratio of the number of repeating structural units in the polyolefin to the amount of the high-valent iodine compound and the grafted monomer is (30~40):(2~12):(1~6), preferably (32~38):(4~8):(1~4), more preferably (32~38):(4~6):(1~3), and most preferably (34~36):(4~6):(1~2).
[0022] Furthermore, the preparation method of the above-mentioned functionalized polyolefin includes the following steps: after homogenizing the polyolefin, the grafted monomer and the high-valent iodine compound, heating and reacting them to obtain the functionalized polyolefin.
[0023] Compared with the prior art, the present invention has the following beneficial effects:
[0024] The functionalized polyolefin of the present invention is grafted with polar functional groups containing imide structures. These polar functional groups are diverse in type. Furthermore, the functionalized polyolefin achieves functionalization of its polar functional groups while maintaining the original structure of the polyolefin to the greatest extent possible, and obtains the effect of lowering the melting point. Attached Figure Description
[0025] Figure 1 The infrared characterization spectra of the functionalized polyolefin obtained in Example 2 and the polyolefin in Comparative Example 1 are shown.
[0026] Figure 2 The above is a comparison of the 1H NMR spectra of the functionalized polyolefin obtained in Example 2 and the polyolefin in Comparative Example 1.
[0027] Figure 3 This is a DSC comparison chart of the functionalized polyolefin obtained in Example 2 and the polyolefin in Comparative Example 1. Detailed Implementation
[0028] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.
[0029] Unless otherwise specified, all materials and reagents used are commercially available.
[0030] In the following examples and comparative examples, the grafting rate of functionalized polyolefins was determined using nuclear magnetic resonance (NMR): the polyolefins were dissolved in deuterated tetrachloroethane, with TMS as an internal standard, and the test temperature was 120 °C.
[0031] The molecular weight of the functionalized polyolefins was determined using high-temperature gel permeation chromatography (HT-GPC): 1,2,4-trichlorobenzene (TCB) was used as the eluent, the flow rate was 1.0 ml / min, and the test temperature was 150 °C.
[0032] The melting point of the functionalized polyolefin was determined by differential scanning calorimetry (DSC): 30~200℃ with two heating methods, heating rate of 10℃ / min and cooling rate of 10℃ / min.
[0033] Example 1
[0034] This embodiment provides a functionalized polyolefin P1, the synthesis method of which is as follows:
[0035] Take a clean, anhydrous reaction flask, place a magnetic stir bar inside, and add LDPE (approximately 35 mmol of repeating structural units) to each flask. w =213.3 kg / mol, PDI=4.9, T m=112.3℃), iodophthalic acid (4 mmol), N-hydroxyphthalimide (2 mmol) and 10 ml of tetrachloroethane were used as solvents. The mixture was stirred at 100 ℃ for 2 h. After the reaction was completed, the heating was stopped. A clean 100 ml beaker was prepared and 50 ml of 95% ethanol was added. The solution after the reaction was added to the 95% ethanol, and a white powder precipitated. The mixture was stirred for 30 min, filtered and dried to obtain the functionalized polyolefin P1.
[0036] Example 2
[0037] This embodiment provides a functionalized polyolefin P2, the synthesis method of which is as follows:
[0038] Take a clean, anhydrous, and oxygen-free reaction flask, place a magnetic stir bar inside, and add LDPE (number of repeating structural units, M) to the reaction flask. w PDI, T m Same as in Example 1), iodophthalic acid (6 mmol), N-hydroxyphthalimide (3 mmol) and 10 ml of tetrachloroethane were used as solvents. The mixture was stirred at 100°C for 2 h. After the reaction was completed, heating was stopped. A clean 100 ml beaker was prepared and 50 ml of 95% ethanol was added. The solution after the reaction was added to the 95% ethanol, and a white powder precipitated. The mixture was stirred for 30 min, filtered and dried to obtain the functionalized polyolefin P2.
[0039] Example 3
[0040] This embodiment provides a functionalized polyolefin P3, the synthesis method of which is as follows:
[0041] Take a clean, anhydrous, and oxygen-free reaction flask, place a magnetic stir bar inside, and add LDPE (number of repeating structural units, M) to the reaction flask. w PDI, T m Same as in Example 1), iodophthalic acid (8 mmol), N-hydroxyphthalimide (4 mmol) and 10 ml of tetrachloroethane were used as solvents. The mixture was stirred at 100°C for 2 h. After the reaction was completed, heating was stopped. A clean 100 ml beaker was prepared and 50 ml of 95% ethanol was added. The solution after the reaction was added to the 95% ethanol, and a white powder precipitated. The mixture was stirred for 30 min, filtered and dried to obtain functionalized polyolefin P3.
[0042] Example 4
[0043] This embodiment provides a functionalized polyolefin P4, the synthesis method of which is as follows:
[0044] Take a clean, anhydrous, and oxygen-free reaction flask, place a magnetic stir bar inside, and add LDPE (number of repeating structural units, M) to the reaction flask. w PDI, T m Same as in Example 1), iodophthalic acid (6 mmol), N-hydroxyphthalimide (2 mmol) and 10 ml of tetrachloroethane were used as solvents. The mixture was stirred at 100°C for 2 h. After the reaction was completed, heating was stopped. A clean 100 ml beaker was prepared and 50 ml of 95% ethanol was added. The solution after the reaction was added to the 95% ethanol, and a white powder precipitated. The mixture was stirred for 30 min, filtered and dried to obtain functionalized polyolefin P4.
[0045] Example 5
[0046] This embodiment provides a functionalized polyolefin P5, the synthesis method of which is as follows:
[0047] Take a clean, anhydrous, and oxygen-free reaction flask, place a magnetic stir bar inside, and add LDPE (number of repeating structural units, M) to the reaction flask. w PDI, T m Same as in Example 1), iodophthalic acid (6 mmol), N-hydroxyphthalimide (1 mmol) and 10 ml of tetrachloroethane were used as solvents. The mixture was stirred at 100 °C for 2 h. After the reaction was completed, the heating was stopped. A clean 100 ml beaker was prepared and 50 ml of 95% ethanol was added. The solution after the reaction was added to the 95% ethanol, and a white powder precipitated. The mixture was stirred for 30 min, filtered and dried to obtain the functionalized polyolefin P5.
[0048] Example 6
[0049] This embodiment provides a functionalized polyolefin P6, the synthesis method of which is as follows:
[0050] Take a clean, anhydrous, and oxygen-free reaction flask, place a magnetic stir bar inside, and add LDPE (number of repeating structural units, M) to the reaction flask. w PDI, T m Same as in Example 1), dichloroiodobenzene (6 mmol), N-hydroxyphthalimide (3 mmol) and 10 ml of tetrachloroethane were used as solvents. The mixture was stirred at 100 °C for 2 h. After the reaction was completed, the heating was stopped. A clean 100 ml beaker was prepared and 50 ml of 95% ethanol was added. The solution after the reaction was added to the 95% ethanol, and a white powder precipitated. The mixture was stirred for 30 min, filtered and dried to obtain the functionalized polyolefin P6.
[0051] Example 7
[0052] This embodiment provides a functionalized polyolefin P7, the synthesis method of which is as follows:
[0053] Take a clean, anhydrous, and oxygen-free reaction flask, place a magnetic stir bar inside, and add LDPE (number of repeating structural units, M) to the reaction flask. w PDI, T m Same as in Example 1), 2-iodobenzoic acid (6 mmol), N-hydroxyphthalimide (3 mmol) and 10 ml of tetrachloroethane were used as solvents. The mixture was stirred at 100 °C for 2 h. After the reaction was completed, the heating was stopped. A clean 100 ml beaker was prepared and 50 ml of 95% ethanol was added. The solution after the reaction was added to the 95% ethanol, and a white powder precipitated. The mixture was stirred for 30 min, filtered and dried to obtain the functionalized polyolefin P7.
[0054] Example 8
[0055] This embodiment provides a functionalized polyolefin P8, the synthesis method of which is as follows:
[0056] Take a clean, anhydrous, and oxygen-free reaction flask, place a magnetic stir bar inside, and add LDPE (number of repeating structural units, M) to the reaction flask. w PDI, T m Same as in Example 1), [hydroxy(toluenesulfonyloxy)iodo]benzene (6 mmol), N-hydroxyphthalimide (3 mmol) and 10 ml of tetrachloroethane were used as solvents. The mixture was stirred at 100 °C for 2 h. After the reaction was completed, the heating was stopped. A clean 100 ml beaker was prepared and 50 ml of 95% ethanol was added. The solution after the reaction was added to the 95% ethanol, and a white powder precipitated. The mixture was stirred for 30 min, filtered and dried to obtain the functionalized polyolefin P8.
[0057] Example 9
[0058] This embodiment provides a functionalized polyolefin P9, the synthesis method of which is as follows:
[0059] Take a clean, anhydrous, and oxygen-free reaction flask, place a magnetic stir bar inside, and add LDPE (number of repeating structural units, M) to the reaction flask. w PDI, T m Same as in Example 1), iodophthalic acid (6 mmol), N-hydroxyphthalimide (3 mmol) and 10 ml of tetrachloroethane were used as solvents. The mixture was stirred at 120°C for 2 h. After the reaction was completed, heating was stopped. A clean 100 ml beaker was prepared and 50 ml of 95% ethanol was added. The solution after the reaction was added to the 95% ethanol, and a white powder precipitated. The mixture was stirred for 30 min, filtered and dried to obtain the functionalized polyolefin P9.
[0060] Example 10
[0061] This embodiment provides a functionalized polyolefin P10, the synthesis method of which is as follows:
[0062] Take a clean, anhydrous, and oxygen-free reaction flask, place a magnetic stir bar inside, and add LDPE (number of repeating structural units, M) to the reaction flask. w PDI, T m Same as in Example 1), iodophthalic acid (6 mmol), N-hydroxyphthalimide (3 mmol) and 10 ml of tetrachloroethane were used as solvents. The mixture was stirred at 140 °C for 2 h. After the reaction was completed, the heating was stopped. A clean 100 ml beaker was prepared and 50 ml of 95% ethanol was added. The solution after the reaction was added to the 95% ethanol, and a white powder precipitated. The mixture was stirred for 30 min, filtered and dried to obtain the functionalized polyolefin P10.
[0063] Example 11
[0064] This embodiment provides a functionalized polyolefin P11, the synthesis method of which is as follows:
[0065] Take a clean, anhydrous, and oxygen-free reaction flask, place a magnetic stir bar inside, and add LDPE (number of repeating structural units, M) to the reaction flask. w PDI, T m Same as in Example 1), iodophthalic acid (6 mmol), N-hydroxyphthalimide (3 mmol) and 10 ml of tetrachloroethane were used as solvents. The mixture was stirred at 80°C for 2 h. After the reaction was completed, the heating was stopped. A clean 100 ml beaker was prepared and 50 ml of 95% ethanol was added. The solution after the reaction was added to the 95% ethanol, and a white powder precipitated. The mixture was stirred for 30 min, filtered and dried to obtain the functionalized polyolefin P11.
[0066] Example 12
[0067] This embodiment provides a functionalized polyolefin P12, the synthesis method of which is as follows:
[0068] Take a clean, anhydrous, and oxygen-free reaction flask, place a magnetic stir bar inside, and add LDPE (number of repeating structural units, M) to the reaction flask. w PDI, T mSame as in Example 1), iodophenyl diacetic acid (6 mmol), N-hydroxysuccinimide (3 mmol) and 10 ml of tetrachloroethane were used as solvents. The mixture was stirred at 100 °C for 2 h. After the reaction was completed, heating was stopped. A clean 100 ml beaker was prepared and 50 ml of 95% ethanol was added. The solution after the reaction was added to the 95% ethanol, and a white powder precipitated. The mixture was stirred for 30 min, filtered and dried to obtain the functionalized polyolefin P12.
[0069] Example 13
[0070] This embodiment provides a functionalized polyolefin P13, the synthesis method of which is as follows:
[0071] Take a clean, anhydrous, and oxygen-free reaction flask, place a magnetic stir bar inside, and add LLDPE (approximately 35 mmol of repeating structural units) to the reaction flask; M w =324.3 kg / mol, PDI=9.3, T m =107.1℃), iodophthalic acid (6 mmol), N-hydroxyphthalimide (3 mmol) and 10 ml of tetrachloroethane were used as solvents. The mixture was stirred at 100℃ for 2 h. After the reaction was completed, the heating was stopped. A clean 100 ml beaker was prepared and 50 ml of 95% ethanol was added. The solution after the reaction was added to the 95% ethanol, and a white powder precipitated. The mixture was stirred for 30 min, filtered and dried to obtain functionalized polyolefin P13.
[0072] Example 14
[0073] This embodiment provides a functionalized polyolefin P14, the synthesis method of which is as follows:
[0074] Take a clean, anhydrous, and oxygen-free reaction flask, place a magnetic stir bar inside, and add PP (approximately 35 mmol of repeating structural units) to the reaction flask; M w =320.5 kg / mol, PDI=4.2, T m =167.3℃), iodophthalic acid (7 mmol), N-hydroxyphthalimide (3 mmol) and 10 ml of tetrachloroethane were used as solvents. The mixture was stirred at 100 ℃ for 2 h. After the reaction was completed, the heating was stopped. A clean 100 ml beaker was prepared and 50 ml of 95% ethanol was added. The solution after the reaction was added to the 95% ethanol, and a white powder precipitated. The mixture was stirred for 30 min, filtered and dried to obtain functionalized polyolefin P14.
[0075] Comparative Example 1: LDPE, M, the raw material for the preparation of Examples 1-12 w =213.3 kg / mol, PDI=4.9, Tm =112.3℃.
[0076] Comparative Example 2: Preparation of Raw Material LLDPE, M in Example 13 w =324.3 kg / mol, PDI=9.3, T m =107.1℃.
[0077] Comparative Example 3: Raw materials for the preparation of Example 14, PP, M w =320.5 kg / mol, PDI=4.2, T m =167.3℃.
[0078] The functionalized polyolefins P1-P14 were characterized by NMR, DSC, and GPC, and functionalized polyolefin P2 was characterized by infrared spectroscopy. The infrared comparison spectra of functionalized polyolefin P2 obtained in Example 2 and LDPE of Comparative Example 1 are shown below. Figure 1 As shown, the NMR comparison diagram is as follows: Figure 2 As shown, the DSC comparison chart is as follows: Figure 3 As shown. By Figure 1 It can be seen that, compared with the LDPE of Comparative Example 1, the functionalized polyolefin P2 obtained in Example 2 has a higher growth rate at 1745 cm⁻¹. -1 A distinct C=O stretching vibration peak appeared at the phthalimide concentration. This peak is a characteristic absorption peak of the phthalimide group, indicating that a carbonyl-containing functional group, i.e., a phthalimide structure, has been introduced into the molecular chain of the functionalized polyolefin P2. Furthermore... Figure 2 The functionalized polyolefin P2 obtained in Example 2 showed a distinct characteristic peak of aromatic hydrogen on the benzene ring near a chemical shift of 8 ppm, indicating that a phthalimide structure was successfully incorporated into the structure of the functionalized polyolefin P2. Furthermore, Figure 3 The melting point T of the functionalized polyolefin P2 obtained in Example 2 m The decrease indicates that the phthalimide structure has been successfully incorporated into the LDPE molecular chain, as the incorporation of the phthalimide structure disrupts the symmetry and regularity of the LDPE molecular chain, resulting in a decrease in TL. m The decrease.
[0079] T of each polymer m M w、The PDI and the molar percentage of repeating structural units containing grafted monomers (N-hydroxyphthalimide, N-hydroxysuccinimide) relative to the total number of repeating structural units in the functionalized polyolefin, calculated based on NMR results, i.e., the amount of polar group insertion, are shown in Table 1. The amount of polar group insertion when the grafted monomer is phthalimide was confirmed by the integrated area of aryl hydrogens and the integrated area of methylene hydrogens on the polyolefin molecular chain in the NMR spectrum. Specifically: the amount of polar group insertion = [(integrated area with a chemical shift of approximately 8 ppm / 4) / (integrated area with a chemical shift of approximately 1.2~1.8 ppm) / 2] × 100%.
[0080]
[0081] As can be seen from the above data, the functionalized polyolefin of the present invention has a lower melting point compared with the raw material polyolefin, and at the same time, the molecular weight of the modified functionalized polyolefin does not show a significant decrease. Furthermore, the functionalized polyolefin of the present invention has the properties of controllable melting point and polar group content (1-15 mol%).
[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading this application specification, they can still modify or make equivalent substitutions to the specific implementation of the present invention, but these modifications or changes do not depart from the protection scope of the pending claims of the present invention.
Claims
1. A functionalized polyolefin, characterized in that, The structural formula of the functionalized polyolefin is shown in formula (Ⅰ): Equation (Ⅰ); Wherein, R is selected from at least one of the following formulas (II) and (III); Equation (II); Formula (Ⅲ); Furthermore, R1, R2, R3, R4, R5, and R6 in the formula are each independently at least one of hydrogen atom, methyl, ethyl, tert-butyl, carboxyl, methoxy, cyano, aldehyde, halogen, hydroxyl, and amino.
2. The functionalized polyolefin according to claim 1, characterized in that, The weight-average molecular weight of the functionalized polyolefin is 40~200 Kg / mol; And / or, the weight-average molecular weight of the functionalized polyolefin is more than 20% of the weight-average molecular weight of the polyolefin used as the raw material for preparing the functionalized polyolefin.
3. The functionalized polyolefin according to claims 1-2, characterized in that, The percentage of repeating structural units containing the R group relative to the total number of repeating structural units in the functionalized polyolefin is 1-15 mol%. And / or, the weight-average molecular weight of the functionalized polyolefin is 20% to 90% of the weight-average molecular weight of the polyolefin used as the raw material for preparing the functionalized polyolefin.
4. The functionalized polyolefin according to claims 1-2, characterized in that, The percentage of repeating structural units containing the R group relative to the total number of repeating structural units in the functionalized polyolefin is 1-8 mol%%. And / or, the weight-average molecular weight of the functionalized polyolefin is 40% to 90% of the weight-average molecular weight of the polyolefin used as the raw material for preparing the functionalized polyolefin.
5. The functionalized polyolefin according to claims 1-2, characterized in that, The percentage of repeating structural units containing the R group relative to the total number of repeating structural units in the functionalized polyolefin is 1.5–7 mol%. And / or, the weight-average molecular weight of the functionalized polyolefin is 70% to 90% of the weight-average molecular weight of the polyolefin used as the raw material for preparing the functionalized polyolefin.
6. The functionalized polyolefin according to any one of claims 1 to 5, characterized in that, Its raw materials include polyolefins, high-valent iodine compounds, and grafted monomers.
7. The functionalized polyolefin according to claim 6, characterized in that, The monomers for preparing the polyolefin include at least one of ethylene, propylene, styrene, 1-butene, 1-hexene, 1-octene, and butadiene.
8. The functionalized polyolefin according to claim 6, characterized in that, The grafting monomer is selected from at least one of N-hydroxyphthalimide and its derivatives, and N-hydroxysuccinimide and its derivatives.
9. The functionalized polyolefin according to claim 6, characterized in that, The high-valent iodine compound is selected from at least one of iodic acid, iodophenyl diacetic acid, dichloroiodobenzene, 2-iodoacylbenzoic acid, Desmond-Martin reagent, bis(trifluoroacetoxy)iodobenzene, [hydroxy(toluenesulfonyloxy)iodo]benzene, and aryliodobis(carboxylate).
10. The functionalized polyolefin according to claim 6, characterized in that, The ratio of the number of repeating structural units in the polyolefin to the amount of the high-valent iodine compound and the grafted monomer is (30~40):(2~12):(1~6).