Method for preparing polylactic acid-polycarbonate copolymers

A technology of polycarbonate and copolymer, which is applied in the field of preparation of polylactic acid-polycarbonate copolymer, can solve the problems of lack of flexibility and elasticity, poor toughness, high crystallinity, etc., achieve easy industrial production, improve heat resistance, The effect of simple process

Active Publication Date: 2008-01-09
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PLA is hard, has poor toughness, lacks flexibility and elasticity, and is easily bent and deformed; the degree of crystallinity is high, the degradation rate is not easy to control, and it cannot achieve functional expansion through chemical reactions.
These characteristics of polylactic acid greatly limit its use and effect, and it is urgent to improve its performance by modification.

Method used

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  • Method for preparing polylactic acid-polycarbonate copolymers

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Comparison scheme
Effect test

Embodiment 1

[0021] (1) 368g of L-lactic acid, 20g of phenylglycolic acid and 12g of succinic acid are added to the reactor, vacuumize, add 0.5% catalyst stannous octoate to carry out polycondensation reaction, the pressure in the reactor is 2000Pa, and the temperature is 100 ℃, reacted for 5 hours, then lowered the pressure in the reactor to below 100Pa, raised the reaction temperature to 180℃, and continued to react for 20 hours to obtain M w =0.8×10 3 ~2.0×10 4 Carboxy-terminated lactic acid prepolymer;

[0022] (2) The carboxyl-terminated lactic acid prepolymer obtained in step (1) and polyhexamethylene carbonate diol (molecular weight 2000) are added in the reactor by the molar ratio of 1: 2, vacuumize, logical N 2 Gas, adding 0.1% catalyst tin protochloride to carry out polymerization reaction; Reaction temperature is 180 ℃, reacts for 10 hours, promptly obtains desired product, and this product weight-average molecular weight M w 0.5×10 5 ~1×10 5 .

Embodiment 2

[0024] (1) 736g of L-lactic acid, 40g of o-hydroxybenzoic acid and 24g of adipic acid are added to the reactor, vacuumize, add 0.8% catalyst stannous bromide to carry out polycondensation reaction, the pressure in the reactor is 1800Pa, the temperature 120°C, reacted for 3 hours, then lowered the pressure in the reactor to below 100Pa, raised the reaction temperature to 170°C, and continued to react for 15 hours to obtain M w =0.8×10 3 ~2.0×10 4 Carboxy-terminated lactic acid prepolymer;

[0025] (2) The carboxyl-terminated lactic acid prepolymer obtained in step (1) and 1,6-hexanediol carbonate (molecular weight 2000) are added in the reactor at a molar ratio of 1:1, vacuumized, and ventilated N 2 Gas, add 0.5% catalyst tin protochloride to carry out polymerization reaction; Reaction temperature is 170 ℃, reacts for 8 hours, promptly obtains desired product, and this product weight-average molecular weight M w 0.5×10 5 ~1×10 5 .

Embodiment 3

[0027] (1) 328g of L-lactic acid, 60g of o-hydroxybenzoic acid and 12g of maleic anhydride are joined in the reactor, vacuumize, add 0.1% catalyst stannous octoate to carry out polycondensation reaction, the pressure in the reactor is 1500Pa, and the temperature is 90°C, reacted for 2 hours, then lowered the pressure in the reactor to below 100Pa, raised the reaction temperature to 160°C, and continued to react for 18 hours to obtain M w =0.8×10 3 ~2.0×10 4 Carboxy-terminated lactic acid prepolymer;

[0028] (2) The carboxyl-terminated lactic acid prepolymer obtained in step (1) and polypropylene carbonate (molecular weight 2000) are added in the reactor by 1: 1 molar ratio, vacuumize, logical N 2 Gas, adding 1.5% catalyst tin protochloride to carry out polymerization reaction; Reaction temperature is 160 ℃, reacts for 6 hours, promptly obtains desired product, and this product weight-average molecular weight M w 0.5×10 5 ~1×10 5 .

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Abstract

Production of poly-lactic acid-poly-ester carbonate is carried out by reacting lactic acid with small molecular acid containing phen-cyclic and small molecular binary acid under catalyst condition, condensation polymerizing to synthesize carboxy-capping lactic acid pre-polymer directly, adding into fatty polycarbonate dibasic alcohol and catalyst, vacuum supplying under N2 atmosphere, and reacting for 5-10 hrs at 150-200 deg. C. It's simple and biologically degradable, has high molecular weight and better toughness and heat resistance and can be used for industrial production.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of a polylactic acid-polycarbonate copolymer. Background technique [0002] Environmental pollution and resource shortage have become major problems that human society has to solve, and more and more attention has been paid to sustainable development strategies such as environment and resources in the world. Some biofunctional, degradable and renewable polymer materials have emerged as the times require. Among them, the research on the synthesis, processing and application of polylactic acid is the most active. Polylactic acid can be completely degraded into carbon dioxide and water, and has no pollution to the environment. Because of its good strength, softness, permeability and easy processing, it can be used in agriculture, packaging and other fields to replace traditional materials, and has a wide range of applications in ecologica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/64C08G63/86C08G81/00
Inventor 任杰杨铭顾书英于涛任天斌
Owner TONGJI UNIV
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