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Condensation polymerization method for preparing hydroxylated acid condensation polymer

A technology of condensation polymerization and hydroxy acid, applied in the field of condensation polymerization for preparing hydroxy acid polycondensate, can solve the problems of undesired removal of catalyst post-treatment, technical difficulty of catalyst, shortage of resources, etc., achieves excellent biocompatibility, improves catalysis Effect, effect of large molecular weight

Inactive Publication Date: 2006-02-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, with the rapid development of the polymer industry, polymer synthetic materials have also encountered two difficult problems: environmental pollution and resource shortage
Since the removal of residual catalyst is not only technically difficult but also expensive, post-treatment for catalyst removal is generally not desirable in industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Add 50 grams of 90% L-lactic acid aqueous solution into a 250 mL three-neck round bottom flask, start magnetic stirring, and heat in an oil bath. Dehydrate at 100°C for 2 hours under normal pressure; then gradually reduce the pressure to 1 300Pa (10 mm Hg), raise the temperature to 130°C, and dehydrate for 2 hours; the L-lactic acid with a weight average molecular weight of 520 is obtained. polymer; then continue dehydration for 4 hours at 150° C. and 520 Pa (4 mm Hg), to obtain a lactic acid oligomer with a weight average molecular weight of 1610. After cooling, add 0.002 moles of methyltriphenylphosphonium bromide to a three-necked round-bottomed flask, mix well, gradually raise the temperature to 170°C, and gradually reduce the pressure to 130Pa (1 mm Hg), After 10 hours of reaction, the yield of polylactic acid was 90.5%, the weight average molecular weight measured by gel permeation chromatography was 12870, and the polydispersity index was 1.36.

Embodiment 2

[0046]The preparation of lactic acid oligomer was as in Example 1. Add 0.002 mole of tetrabutylammonium chloride in the lactic acid oligomer of gained, gradually warming up to 170 ℃, gradually reducing pressure to 130Pa (1 mm Hg), react for 10 hours, the productive rate of polylactic acid is 84.7%, The weight average molecular weight measured by gel permeation chromatography was 6870, and the polydispersity index was 1.48.

Embodiment 3

[0048] The preparation of lactic acid oligomer was as in Example 1. Add 0.004 mole of N-butylpyridine bromide to the obtained lactic acid oligomer, gradually heat up to 170°C, gradually reduce the pressure to 130Pa (1 mm Hg), react for 10 hours, and the yield of polylactic acid is 93.1%. , the weight average molecular weight measured by gel permeation chromatography is 11000, and the polydispersity index is 1.26.

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Abstract

The invention provides a condensation polymerization process for preparing hydroxylated acid condensation polymer, characterized in that hydroxylated acid or hydroxylated acid oligomer are subject to molten condensation polymerization reaction or molten / solid phase condensation polymerization reaction at the presence of ionic liquid catalytic action. The obtained hydroxylated acid condensation polymer contains no metallic elements.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and specifically relates to a condensation polymerization method for preparing hydroxyacid polycondensates, which is characterized in that hydroxyacids or hydroxyacid oligomers are melted under the catalytic action of a catalyst containing at least one ionic liquid Condensation polymerization or melt / solid phase condensation polymerization to obtain high-molecular-weight, high-purity biodegradable polymer materials—hydroxy acid condensation polymers such as polylactic acid, polyglycolic acid or their copolymers. technical background [0002] The vigorous development of the plastics industry has brought many high-performance polymer synthetic materials to human production and life, and has made positive contributions to promoting the development of society. However, with the rapid development of the polymer industry, polymer synthetic materials have also encountered two difficult problem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/06C08G63/80
Inventor 吴林波王伟超黄源李伯耿
Owner ZHEJIANG UNIV
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