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Catalyst system for preparing block polymer and method for catalytic synthesis of block polymer

A technology of block polymer and catalytic system, which is applied in the production of bulk chemicals, can solve the problems of waste of energy and increased cost, and achieve the effect of improving the possibility of use

Active Publication Date: 2019-10-11
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, block copolymers obtained by these catalysts require the addition of additional initiators or cocatalysts
Undoubtedly, this will increase costs and consume energy

Method used

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  • Catalyst system for preparing block polymer and method for catalytic synthesis of block polymer
  • Catalyst system for preparing block polymer and method for catalytic synthesis of block polymer
  • Catalyst system for preparing block polymer and method for catalytic synthesis of block polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] According to the molar ratio of 1:1, take N-methylimidazole and halogenated alkyl alcohol respectively, at a temperature of 50°C, in N 2 After reacting N-methylimidazole with halogenated alkanes for 24 h during protection, it was purified with acetonitrile and ether, and dried in vacuum to obtain a catalytic system (ionic liquid) for the preparation of block polymers. By comparing with published papers ( Angew. Chem. 2018, 130, 17130–17134), reflecting the effectiveness of the ionic liquid catalytic system prepared in Example 1 for the block copolymerization of cyclic anhydrides, epoxides and lactides.

[0023] Add 0.2 g of ionic liquid, 3 g of phthalic anhydride and 3 g of lactide into the reaction flask, vacuumize for 25 min, then add 5 mL of tetrahydrofuran and 5 mL of propylene oxide, and react at 80 °C for 24 h; After the reaction was completed, the reaction system was dissolved with chloroform, and purified with methanol acidified with hydrochloric acid to obtai...

Embodiment 2

[0027] According to the molar ratio of 1:1.2, take N-methylimidazole and halogenated alkyl alcohol respectively, at a temperature of 70 ℃, in N 2 After reacting N-methylimidazole with halogenated alkanes for 10 hours during protection, purify with acetonitrile and ether, and dry in vacuum to obtain a catalytic system (ionic liquid) for preparing block polymers. By comparing with published papers ( Angew. Chem. 2018, 130, 17130–17134), reflecting the effectiveness of the ionic liquid catalytic system prepared in Example 2 for the block copolymerization of cyclic anhydrides, epoxides and lactides.

[0028] Add 0.05 g of ionic liquid, 2 g of succinic anhydride and 2 g of lactide into the reaction flask, vacuumize for 15 min, then add 5 mL of toluene and 4 mL of propylene oxide, and react at 90 °C for 12 h; the reaction is complete Afterwards, the reaction system was dissolved with chloroform, and purified with methanol acidified with hydrochloric acid to obtain a block polymer....

Embodiment 3

[0031] According to the molar ratio of 1:1.1, take N-methylimidazole and halogenated alkyl alcohol respectively, at a temperature of 60°C, in N 2 After reacting N-methylimidazole with halogenated alkanes for 17 h during protection, it was purified with acetonitrile and ether, and dried in vacuum to obtain a catalytic system (ionic liquid) for the preparation of block polymers. By comparing with published papers ( Angew. Chem. 2018, 130, 17130–17134) showed the effectiveness of the ionic liquid catalytic system prepared in Example 3 for the block copolymerization of cyclic anhydrides, epoxides and lactides.

[0032] Add 0.1 g of ionic liquid, 3 g of phthalic anhydride and 2 g of lactide into the reaction flask, vacuumize for 15 min, then add 5 mL of N, N-dimethylformamide and 5 mL of epichlorohydrin, The reaction was carried out at 70°C for 16 h; after the reaction was completed, the reaction system was dissolved in chloroform and purified with methanol acidified with hydroch...

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Abstract

The invention discloses a catalyst system for preparing a block polymer and a method for catalytic synthesis of the block polymer. Under the N2 protection and the certain temperature, N-methylimidazole reacts with haloalkylation alcohol, acetonitrile and diethyl ether are purified, vacuum drying is performed, and the catalyst system for preparing the block polymer is prepared; the catalyst systemcatalyzes cyclo-anhydride, epoxide and lactide to react in an organic solvent under the certain temperature, chloroform is used for dissolving a reaction system, methyl alcohol acidified by hydrochloric acid is purified, and the block polymer is obtained. No any metal ion is introduced to the catalyst system, the problem that metal residues are caused in a traditional metal catalyst system is avoided, the system is environmentally friendly, meanwhile no extra auxiliary catalyst or initiator needs to be added in the preparation process, and the system is simple and convenient to use.

Description

technical field [0001] The invention belongs to the technical field of polymer material synthesis, and relates to a catalyst system for preparing block polymers; the invention also relates to a method for catalytically synthesizing block polymers with the catalyst system. Background technique [0002] Currently, the ring-opening alternating copolymerization (ROAC) of epoxides with cyclic anhydrides has been considered as a promising approach to diversify polyesters. On the other hand, the ring-opening polymerization (ROP) of lactide (LA) is an effective method to produce PLA with excellent biocompatibility, biodegradability, and mechanical properties. A large number of catalysts produce polyester and PLA by ROAC and ROP, including metal complexes, quaternary onium salts, phosphazenes, Lewis pairs, etc. Block copolymers are an interesting class of macromolecules due to their special properties. There are many applications in fields such as medicine, nanotechnology, lithogra...

Claims

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Application Information

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IPC IPC(8): C08G63/87C08G63/08C08G63/58
CPCC08G63/08C08G63/58C08G63/823Y02P20/54
Inventor 宋鹏飞陈亚伦王紫娟张宗莲于丽曹雪梅马菁菁
Owner NORTHWEST NORMAL UNIVERSITY
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