High performance specialty polyether materials with terminal group directed modification and methods of making the same

Abstract

The application belongs to the technical field of high polymer synthesis, and particularly relates to high-performance special polyether material with terminal group directional modification and a preparation method thereof. The intermediate is prepared by sequentially grafting 4-bromobenzoate at the crown ether methylene, and amination of the bromine atom. Then, the amino group of the intermediate is reacted with the polyether capped with isocyanate to form a urea bond, so that the terminal group of the polyether structure is chemically modified, and the special polyether material is endowed with separation performance. When the special polyether material is applied to a nanofiltration separation membrane, the water permeability can be significantly improved, and magnesium and lithium ions can be efficiently and selectively separated. The terminal group of the polyether structure is chemically modified through specific reaction, and the application potential of the special polyether material in emerging fields such as high-performance separation membranes is expanded.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of high polymer synthesis, and particularly relates to a high-performance special polyether material with oriented modification of terminal groups and a preparation method thereof. BACKGROUND

[0002] Polyether material is a linear polymer prepared by polyaddition reaction of a starter and ethylene oxide (EO), propylene oxide (PO), butylene oxide (BO) and the like under catalysis, and the compound thereof with or without specific structure modification is widely used in petrochemical, mining, daily chemical, agricultural chemical, industrial cleaning, lubricating oil and other industries. This kind of material occupies an important position in the industrial field due to its strong designability of molecular structure and wide adjustable range of performance.

[0003] With the continuous expansion of the application field of polyether material products and the continuous expansion of market demand, the production requirements for the polyether industry are increasingly improved. Especially in high-end application fields such as high-performance separation membranes and new energy materials, traditional polyether materials have been difficult to meet the growing technical needs. This mainly manifests in the following aspects: first, the terminal groups of conventional polyether materials are mostly hydroxyl groups or simple end-capping groups, which lack functional modification and limit their application in fields such as selective separation; second, the existing polyether modification technology is mostly focused on the adjustment of the main chain structure, and there is less research on the precise control of the terminal groups; third, in the application of membrane separation, traditional polyether materials often have difficulty in meeting the dual requirements of high permeability and high selectivity.

[0004] Therefore, it is urgent to develop efficient and environmentally friendly domestic high-end special polyether preparation technology, and to continuously promote the specialized, diversified and personalized application of special polyether materials, so as to promote the development of the polyether industry in the direction of environmental protection, low carbon and high added value. In particular, a new modification method capable of precisely modifying the terminal groups of polyether and introducing specific functional groups is needed. This method should be able to maintain the excellent processing performance of polyether materials while endowing them with new functional properties to meet the needs of complex separation systems. SUMMARY

[0005] In order to overcome the shortcomings of the prior art, the primary purpose of the present application is to provide a high-performance special polyether material with oriented modification of terminal groups, which can significantly improve the water permeability and has excellent magnesium-lithium selective separation performance when applied to nanofiltration separation membranes.

[0006] Another purpose of the present application is to provide a preparation method of the above-mentioned high-performance special polyether material with oriented modification of terminal groups, which chemically modifies the terminal groups of the polyether structure through a specific reaction, thereby expanding the application potential of special polyether materials in emerging fields such as high-performance separation membranes.

[0007] The purpose of the present application is achieved by the following technical solutions:

[0008] A high-performance special polyether material with terminal group directional modification, the structural formula of the high-performance special polyether material with terminal group directional modification is:

[0009] .

[0010] Further, comprising the following steps:

[0011] (1) under the inert gas atmosphere, the dichloromethane solution of polyethylene glycol is added to the dichloromethane solution of hexamethylene diisocyanate, and then dibutyltin dilaurate is added, and the reaction is carried out under stirring; after the reaction is completed, the intermediate 1 is obtained by purification treatment;

[0012] The structural formula of the intermediate 1 is:

[0013] ;

[0014] (2) under the inert gas atmosphere, the t-butyl hydroperoxide decane solution, tetrabutylammonium iodide, 4-bromobenzaldehyde and 12-crown-4 are mixed, and the reaction is carried out under heating; after the reaction is completed, the intermediate 2 is obtained by post-treatment;

[0015] The structural formula of the intermediate 2 is:

[0016] ;

[0017] (3) the cuprous iodide, the intermediate 2, the sodium phosphate, the ammonia water and the PEG400 are mixed, and the reaction is carried out under heating; after the reaction is completed, the intermediate 3 is obtained by post-treatment;

[0018] The structure of the intermediate 3 is:

[0019] ;

[0020] (4) the intermediate 1 and the intermediate 3 are added to dichloromethane, and the reaction is carried out under the inert gas atmosphere; after the reaction is completed, the solvent is removed, and the high-performance special polyether material with terminal group directional modification is obtained.

[0021] Further, in step (1), the mass ratio of the polyethylene glycol, hexamethylene diisocyanate and dibutyltin dilaurate is (1-2): (1.68-2.52): (0.02-0.04); the reaction time is 12-15 h.

[0022] Further, the amount ratio of the tert-butyl hydroperoxide, the tetrabutylammonium iodide, the 4-bromobenzaldehyde and the 12-crown-4 in step (2) is (4.02-4.10) mmol:(0.1-0.15) mmol:(0.5-0.6) mmol:2 mL.

[0023] Further, the heating temperature in step (2) is 100-120 DEG C, and the reaction time is 16-20 h.

[0024] Further, the amount ratio of the cuprous iodide, the intermediate 2, the sodium phosphate, the ammonia water and the PEG400 in step (3) is (0.05-0.06) mmol:0.5 mmol:(0.5-0.6) mmol:1 mL:(2-3) mL; the concentration of the ammonia water is 25-28 wt%.

[0025] Further, the heating temperature in step (3) is 100-120 DEG C, and the reaction time is 20-24 h.

[0026] Further, the mass ratio of the intermediate 1 and the intermediate 3 in step (4) is 1:(3.11-6.22); the stirring reaction time is 12-15 h.

[0027] Further, the molecular weight of the polyethylene glycol in step (1) is 1000-2000 g / mol.

[0028] The present application has the following effects relative to the prior art:

[0029] 1. The present application obtains the intermediate by grafting 4-bromobenzoate at the crown ether methylene and aminating the bromine atom in sequence, and forms the urea bond by reacting the amino group of the intermediate with the polyether capped with isocyanate, so that the terminal groups of the polyether structure are chemically modified, the special polyether material is endowed with separation performance, the special polyether material is applied to the nanofiltration separation membrane, the water permeation rate can be significantly improved, and excellent magnesium-lithium selective separation performance is obtained. + The crown ether ring in the structure can selectively recognize Li 2+ , the ether bond (-O-) in the polyether chain can form a hydrogen bond network with water molecules, the membrane surface is endowed with superhydrophilicity, the interface energy barrier of water transmission is reduced, the water permeation rate is significantly improved, and the formed urea bond crosslinking network not only can enhance the structural stability of the membrane, but also can generate electrostatic repulsion with Mg 2+ , and further strengthen the retention rate of Mg

[0030] 2. The present application chemically modifies the terminal groups of the polyether structure through specific reactions, and expands the application potential of the special polyether material in emerging fields such as high-performance separation membranes. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 Preparation process of high performance special polyether material with terminal group oriented modification in the present application;

[0032] Figure 2 FT-IR graph of high performance special polyether material with intermediate 1 and terminal group oriented modification in the present application;

[0033] Figure 3 Results of magnesium-lithium separation factor in the test example of the present application. DETAILED DESCRIPTION

[0034] The technical solutions of the present application are further described below in combination with the specific embodiments. However, those skilled in the art should understand that the following examples are only used to illustrate the present application, and should not be regarded as a limitation of the present application. The specific conditions not mentioned in the examples are carried out according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used, if not specifically mentioned, are conventional products obtained through commercial channels.

[0035] Example 1

[0036] Example 1 provides a high performance special polyether material with terminal group oriented modification, which has the following structural formula:

[0037] .

[0038] Example 1 also provides a preparation method of the above high performance special polyether material with terminal group oriented modification, and the reaction process is as shown in Figure 1 , and the specific steps are as follows:

[0039] (1) Take polyethylene glycol (Mw=1000 g / mol, 1.0 g) and place it in a 50 mL round-bottom flask, connect a vacuum pump, and vacuumize at 40°C for 6 h (≤0.1 mmHg); after closing the vacuum, protect it with nitrogen, quickly dissolve it in 15 mL of dichloromethane (previously dried with molecular sieves, water ≤30 ppm) to obtain a polyethylene glycol solution; then slowly add the above polyethylene glycol solution to a 50 mL anhydrous DCM solution of hexamethylene diisocyanate (HDI, 1.68 g) under nitrogen protection and stirring, add 1 drop of dibutyltin dilaurate (DBTDL, 20 mg) after the addition is completed, and stir at room temperature for 14 h; after the reaction is completed, concentrate the solvent by rotary evaporation, then add 300 mL of hexane to precipitate the product, separate the upper solution, and vacuum dry the remaining viscous liquid to obtain intermediate 1; the FT-IR graph of intermediate 1 is shown by curve a in Figure 2 , and the characteristic peak of isocyanate group appears at 2255 cm -1 , and 3340 cm -1The presence of amide group N-H stretching vibration peak indicates the successful preparation of intermediate 1.

[0040] (2) Under nitrogen protection, tetrabutylammonium iodide Bu4NI (0.12 mmol), 4-bromobenzaldehyde (0.55 mmol), t-butyl hydroperoxide TBHP solution in decane (0.74 mL, 5.5 M, 4.07 mmol) and 12-crown-4 (2 mL) were added into a Schlenk tube, and stirred at 110°C for 18 h. The volatile matter was removed by rotary evaporation, and the residue was purified by silica gel column chromatography (petroleum ether / EtOAc = 20:1, v / v) to obtain intermediate 2; 1 H NMR (CDC 15 H 19 BrO6, 400 MHz, d6-DMSO) δ 7.74-7.70(m, 4H, Ar-H), 6.67(t, 1H, CH), 4.10-4.07 (m, 1H, CH2), 3.85-3.82 (m, 1H,CH2), 3.60-3.40(m, 12H, CH2), ; HRMS (ESI + ): [M+H] + Calculated 375.04, found 375.04.

[0041] (3) Copper iodide CuI (0.055 mmol), intermediate 2 (0.5 mmol), sodium phosphate Na3PO4 (0.55 mmol), 26% ammonia water (1 mL) and PEG-400 (2 mL) were added into a sealed tube, and stirred at 110°C for 22 h; the reaction liquid was cooled to room temperature, extracted with ether 3 times, and the combined organic phase was dried with anhydrous Na2SO4 and the solvent was removed under reduced pressure, and the remaining residue was purified by silica gel column chromatography to obtain the desired intermediate 3; 1 H NMR (CDC 15 H 21 NO6, 400 MHz, d6-DMSO) δ 7.65(d, 2H, Ar-H), 6.67(t, 1H, CH), 6.47(d, 2H, Ar-H), 5.54(s, 2H, NH2), 4.10-4.07 (m, 1H, CH2), 3.85-3.82 (m, 1H, CH2), 3.60-3.40(m, 12H, CH2); HRMS (ESI + ): [M+H] + Calculated 312.14, found 312.14.

[0042] (4) Intermediate 1 (1 g) and intermediate 3 (4.66 g) were added to anhydrous DCM (90 mL) and stirred at room temperature for 13 h under nitrogen atmosphere. The solvent was removed using a rotary evaporator to obtain the end group directed modified high performance special polyether material. The FT-IR spectrum of the end group directed modified high performance special polyether material is shown as curve b in Figure 2 Figure 1, in which the characteristic peak of the isocyanate group at 2255 cm -1 in curve a disappeared compared to curve b, indicating the successful preparation of the end group directed modified high performance special polyether material.

[0043] Example 2

[0044] Example 2 provides an end group directed modified high performance special polyether material, which has the same structural formula as Example 1.

[0045] Example 2 also provides a method for preparing the above end group directed modified high performance special polyether material, and the reaction process is shown in Figure 1 Figure 2, and the specific steps are as follows:

[0046] (1) Polyethylene glycol (Mw=1500 g / mol, 1.5 g) was placed in a 50 mL round-bottom flask, connected to a vacuum pump, and vacuumized (≤0.1 mmHg) at 40°C for 6 h. After the vacuum was turned off, nitrogen was introduced for protection, and the polyethylene glycol was quickly dissolved in 15 mL of dichloromethane (previously dried with molecular sieves, water ≤30 ppm) to obtain a polyethylene glycol solution. Then, the polyethylene glycol solution was slowly added to a 50 mL anhydrous DCM solution of HDI (2.52 g) under nitrogen protection and stirring, and 1-2 drops of DBTDL (40 mg) were added after the addition was completed. The mixture was stirred at room temperature for 15 h. After the reaction was completed, the solvent was concentrated by rotary evaporation, then 300 mL of hexane was added to precipitate the product, the upper solution was separated, and the remaining viscous liquid was dried under vacuum to obtain intermediate 1. The FT-IR of intermediate 1 was consistent with that of Example 1.

[0047] (2) Bu4NI (0.1 mmol), 4-bromobenzaldehyde (0.5 mmol), TBHP solution in decane (0.73 mL, 5.5 M, 4.02 mmol), and 12-crown-4 (2 mL) were added to a Schlenk tube under nitrogen protection, and stirred at 100°C for 20 h. The volatiles were removed by rotary evaporation, and the residue was purified by silica gel column chromatography (petroleum ether / EtOAc=20:1, v / v) to obtain intermediate 2. The 1 H NMR and HRMS of intermediate 2 were consistent with those of Example 1.

[0048] (3) CuI (0.05 mmol), intermediate 2 (0.5 mmol), Na3P04(0.5 mmol), 25% ammonia (1 mL) and PEG-400 (2 mL) were added into a sealed tube, stirred at 100 °C for 24 h; the reaction solution was cooled to room temperature, extracted with diethyl ether for 3 times, the combined organic phase was dried over anhydrous Na2S04and the solvent was removed under reduced pressure, the remaining residue was purified by silica gel column chromatography to obtain the desired intermediate 3; H NMR and HRMS were consistent with Example 1. 1 H NMR and HRMS were consistent with Example 1.

[0049] (4) Intermediate 1 (1 g) and intermediate 3 (3.11 g) were added into anhydrous DCM (80 mL), stirred at room temperature for 12 h under nitrogen atmosphere; the solvent was removed using a rotary evaporator to obtain the end group directed modified high performance special polyether material; FT-IR of the end group directed modified high performance special polyether material was consistent with Example 1.

[0050] Example 3

[0051] Example 3 provides an end group directed modified high performance special polyether material, which has the same structure as Example 1.

[0052] Example 3 also provides a preparation method of the above-mentioned end group directed modified high performance special polyether material, and the reaction process is as shown in Figure 1 The specific steps are as follows:

[0053] (1) Polyethylene glycol (Mw=2000 g / mol, 2.0 g) was taken into a 50 mL round-bottom flask, connected to a vacuum pump, and vacuumized (≤0.1 mmHg) at 40 °C for 6 h; after the vacuum was closed, nitrogen protection was performed, and the polyethylene glycol was quickly dissolved in 15 mL of dichloromethane (previously dried with molecular sieves, water ≤30 ppm) to obtain a polyethylene glycol solution; then the polyethylene glycol solution was slowly added to a 50 mL HDI (2.52 g) anhydrous DCM solution under nitrogen protection and stirring, and 1-2 drops of DBTDL (30 mg) were added after the addition was completed, and stirred at room temperature for 15 h; after the reaction was completed, the solvent was concentrated by rotary evaporation, then 300 mL of hexane was added to precipitate the product, the upper solution was separated, and the remaining viscous liquid was dried under vacuum to obtain intermediate 1; FT-IR of intermediate 1 was consistent with Example 1.

[0054] (2) Bu4NI (0.1 mmol), 4-bromobenzaldehyde (0.6 mmol), TBHP in decane (0.75 mL, 5.5 M, 4.10 mmol) and 12-crown-4 (2 mL) were added into a Schlenk tube under nitrogen atmosphere, and stirred at 120 °C for 16 h. The volatiles were removed by rotary evaporation, and the residue was purified by silica gel column chromatography (petroleum ether / EtOAc = 20:1, v / v) to give intermediate 2; intermediate 2 was used in the next step without further purification. 1 H NMR and HRMS were consistent with Example 1.

[0055] (3) CuI (0.06 mmol), intermediate 2 (0.5 mmol), Na3PO4 (0.6 mmol), 28% ammonia (1 mL) and PEG-400 (3 mL) were added into a sealed tube, and stirred at 120 °C for 20 h; the reaction solution was cooled to room temperature, extracted with diethyl ether for 3 times, and the combined organic phase was dried over anhydrous Na2SO4 and the solvent was removed under reduced pressure, and the remaining residue was purified by silica gel column chromatography to give the desired intermediate 3; intermediate 3 was used in the next step without further purification. 1 H NMR and HRMS were consistent with Example 1.

[0056] (4) Intermediate 1 (1 g) and intermediate 3 (6.22 g) were added into anhydrous DCM (100 mL), and stirred at room temperature for 15 h under nitrogen atmosphere; the solvent was removed using a rotary evaporator to give the end group directionally modified high-performance special polyether material; the FT-IR of the end group directionally modified high-performance special polyether material was consistent with Example 1.

[0057] Test Example

[0058] In order to verify the application of the end group directionally modified high-performance special polyether material prepared in Examples 1-3 in a separation membrane, the end group directionally modified high-performance special polyether material prepared in Examples 1-3 was made into a separation membrane, and the specific steps were as follows:

[0059] The polyethyleneimine (PEI, molecular weight of 70 kDa), the polyether material prepared in any one of Examples 1-3, and Na2CO3 were added into water to prepare an aqueous phase, the concentrations of the PEI, the polyether material prepared in Examples 1-3, and Na2CO3 in the aqueous phase were 0.75 wt%, 0.075 wt%, and 0.1 wt%, respectively; the trimesoyl chloride (TMC) was dissolved in n-hexane to prepare an oil phase, the concentration of the TMC was 0.1 wt%; the aqueous phase was slowly dropped onto the surface of a polysulfone (PSF) substrate, the oil phase was dropped onto the membrane after 6 min, the reaction was carried out for 5 min, then the unreacted monomers were washed away with hexane, and a heat treatment was carried out at 75 °C to obtain a separation membrane. At the same time, a separation membrane prepared by not adding the polyether material prepared in Examples 1-3 in the aqueous phase was prepared as a control group by using the same method.

[0060] The permeation flux of water and the salt rejection rate of each separation membrane were tested by using a membrane permeation selection performance test system, the test system included a pump, a membrane cell, a pipeline, an adjusting valve, a pressure and flow detector, the effective membrane area for the test was 12.56 cm 2 , the permeation time was 5 min, and the test pressure was 5 bar; before the test, a pre-pressing was carried out at room temperature and a pressure of 6 bar for 30 min to achieve a stable flux. When the rejection rate of a single salt magnesium chloride or lithium chloride was tested, the concentrations of the magnesium chloride and lithium chloride solutions were both 1.0 g / L. When the magnesium-lithium separation performance was tested, the total concentration of MgCl2 and LiCl was 2.0 g / L, the Mg 2+ / Li + = 5:1, 10:1, 20:1, 50:1, 80:1, 100:1, and the concentrations of Mg 2+ and Li + were detected by using inductively coupled plasma emission spectroscopy.

[0061] The calculation formula of the permeation rate J of the membrane was as follows:

[0062] J = V / (A x At x Ap), wherein V represented the permeation volume, unit: L; A represented the effective membrane area, unit: m 2 ; At represented the permeation time, unit: h; and Ap represented the transmembrane pressure, unit: bar;

[0063] The calculation formula of the rejection rate R of the membrane was as follows:

[0064] R = [1-(C p / C f )] x 100%, wherein C p and C f represented the concentrations of the solutes in the permeate and the feed, unit: g / L;

[0065] The calculation formula of the magnesium-lithium separation factor S Li, Mg was as follows:

[0066] C f, Mg and C f, Li C represents the concentrations of magnesium ions and lithium ions in the feed liquid, respectively. p, Mg and C p, Li These represent the concentrations of magnesium and lithium ions in the permeate, respectively, in g / L.

[0067] The test results for permeability and rejection rate are shown in Table 1. The test results for magnesium-lithium separation factor are shown in Table 1. Figure 3 As shown.

[0068] Table 1

[0069]

[0070] As shown in Table 1, compared with the control group that did not use the high-performance special polyether material with directional modification of the end groups of this invention, the pure water permeability of the separation membranes prepared in Examples 1-3 of this invention increased by 107.7%-121.2%, indicating that the special polyether material with directional modification of the end groups provided by this invention effectively improves the mass transfer performance of the membrane. Furthermore, the MgCl2 rejection rate of Examples 1-3 remained above 98%, comparable to the control group; while the LiCl rejection rate was significantly lower than that of the control group. This difference in selectivity provides favorable conditions for magnesium-lithium separation.

[0071] Depend on Figure 3 It can be seen that, with the increase of Mg in the feed liquid 2+ / Li + The ratio was increased from 5:1 to 100:1, and the S ratio of Examples 1-3 was increased. Li, Mg The magnesium-lithium ratio gradually increases, while the control group gradually decreases. This indicates that the high-performance special polyether material with directional modification of the terminal groups in this invention has excellent magnesium-lithium separation performance for solutions with a high magnesium-lithium ratio. Furthermore, as the magnesium-lithium ratio continues to increase, the separation membrane obtained has even better magnesium-lithium separation performance.

[0072] 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 them. The basic principles and main features of the present invention have been described above with specific implementation schemes. Based on the present invention, some modifications or substitutions can be made, but these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of protection claimed by the present invention.

Claims

1. A high performance specialty polyether material with end group directed modification, characterized in that, The structure of the high-performance special polyether material with directional modification of end groups is as follows: ； The molecular weight of polyethylene glycol in the raw material for preparing the high-performance special polyether material is 1000-2000 g / mol.

2. The process for the preparation of terminally group directed modified high performance specialty polyether materials as claimed in claim 1, characterized in that, The method comprises the following steps: (1) under an inert gas atmosphere, a dichloromethane solution of polyethylene glycol is added to a dichloromethane solution of hexamethylene diisocyanate, and then dibutyltin dilaurate is added, and the mixture is stirred and reacted; after the reaction is completed, the intermediate 1 is obtained through purification treatment; The structure of the intermediate 1 is as follows: ； (2) under an inert gas atmosphere, a decane solution of tert-butyl hydroperoxide, tetrabutylammonium iodide, 4-bromobenzaldehyde and 12-crown-4 are mixed, and the mixture is heated and reacted; after the reaction is completed, the intermediate 2 is obtained through post-treatment; The structure of the intermediate 2 is as follows: ； (3) cuprous iodide, the intermediate 2, sodium phosphate, ammonia water and PEG400 are mixed, and the mixture is heated and reacted; after the reaction is completed, the intermediate 3 is obtained through post-treatment; The structure of the intermediate 3 is as follows: ； (4) the intermediate 1 and the intermediate 3 are added to dichloromethane, and the mixture is stirred and reacted under an inert gas atmosphere; after the reaction is completed, the solvent is removed, and the high-performance special polyether material with directional modification of end groups is obtained.

3. The process for the preparation of terminally group directed modified high performance specialty polyether materials according to claim 2, characterized in that, In step (1), the mass ratio of the polyethylene glycol, hexamethylene diisocyanate and dibutyltin dilaurate is (1-2):(1.68-2.52):(0.02-0.04); the reaction time is 12-15 h.

4. The process for the preparation of terminally group directed modified high performance specialty polyether materials according to claim 2, characterized in that, In step (2), the amount ratio of tert-butyl hydroperoxide, tetrabutylammonium iodide, 4-bromobenzaldehyde and 12-crown-4 is (4.02-4.10) mmol:(0.1-0.15) mmol:(0.5-0.6) mmol:2 mL.

5. The process for the preparation of terminally group directed modified high performance specialty polyether materials according to claim 2, characterized in that, In step (2), the heating temperature is 100-120 ℃, and the reaction time is 16-20 h.

6. The process for the preparation of terminally group directed modified high performance specialty polyether materials as claimed in claim 2, wherein, In step (3), the amount ratio of cuprous iodide, the intermediate 2, sodium phosphate, ammonia water and PEG400 is (0.05-0.06) mmol:0.5 mmol:(0.5-0.6) mmol:1 mL:(2-3) mL; the concentration of the ammonia water is 25-28 wt%.

7. The process for the preparation of terminally group directed modified high performance specialty polyether materials according to claim 2, characterized in that, In step (3), the heating temperature is 100-120 ℃, and the reaction time is 20-24 h.

8. The process for the preparation of terminally group directed modified high performance specialty polyether materials as claimed in claim 2, wherein, In step (4), the mass ratio of the intermediate 1 and the intermediate 3 is 1:(3.11-6.22); the stirring reaction time is 12-15 h.

9. The process for the preparation of terminally group directed modified high performance specialty polyether materials according to claim 2, characterized in that, In step (1), the molecular weight of the polyethylene glycol is 1000-2000 g / mol.

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