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Biodegradable copolymer and preparation method thereof

A technology of biodegradation and copolymer, applied in the preparation of the copolymer, in the field of polybutylene succinate-polylactic acid copolymer, can solve the problems of poor processing stability, limited wide application, poor impact resistance, etc. The effect of improving toughness, reducing cost and good physical and mechanical properties

Inactive Publication Date: 2011-04-20
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Polylactic acid (PLA), as a synthetic polymer material that is biodegradable, has excellent biocompatibility and can be completely naturally recycled, has been extended to biomedical and environmentally friendly materials, but due to its brittleness, impact resistance Poor, poor processing stability, etc., which limit the wide application of this kind of biomaterials

Method used

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  • Biodegradable copolymer and preparation method thereof
  • Biodegradable copolymer and preparation method thereof
  • Biodegradable copolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Take by weighing the polybutylene succinate oligomer (M n =0.52×10 4 g / mol, M W / M N =1.42) and the polylactic acid oligomer (M n =0.47×10 4 g / mol, M W / M N =2.87), put it into a 1L polyester reaction kettle, add 0.25g of tetrabutyl titanate, replace the air in the reaction kettle with nitrogen for 3 times, control the stirring rate at 60rpm, program the temperature to 190°C, and turn on the vacuum pump to ensure the system The vacuum degree is within 100 Pa, and after reacting under vacuum conditions for 5 hours, the prepared product is extruded with nitrogen gas, and pelletized to obtain a PBS-co-PLA copolymer.

[0042] The crude product of PBS-co-PLA copolymer was dissolved in chloroform, and reprecipitated with a large amount of cold methanol, repeated 2 to 3 times, and finally the product was dried in a vacuum oven at 40°C for 24 hours.

Embodiment 2

[0044] The experimental process and conditions are the same as those in Example 1, the amount of PBS oligomer used is 200g, and the amount of polylactic acid oligomer used is 100g.

Embodiment 3

[0046]The experimental process and conditions are the same as in Example 1, the amount of PBS oligomer used is 200g, and the amount of polylactic acid oligomer used is 25g.

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Abstract

The invention discloses a biodegradable copolymer of PLA-co-PBS (Poly Lactic Acid-co-Poly Butylenes Succinate) and a preparation method thereof. The copolymer is a binary copolymer prepared through a melt polycondensation reaction of a low PBS polymer and a low PLA polymer under a catalytic system and a stabilized system. Measured by GPC (Gel Permeation Chromatography), the copolymer has the weight-average molecular weight ranging from 4.25*104 g / mol to 7.34*104 g / mol and the molecular weight distribution MW / MN ranging from 1.47 to 1.84 as well favorable physical and mechanical performance, is completely degradable and is widely applied to sheets, membranes, and the like.

Description

technical field [0001] The invention relates to a biodegradable copolymer, especially a polybutylene succinate-polylactic acid copolymer (PBS-co-PLA), and also relates to a preparation method of the copolymer. Background technique [0002] In recent years, due to the environmental pollution caused by plastic waste, the sustainability of human production activities and the reduction of carbon dioxide emissions have attracted much attention, and research on environmental protection, resource and energy conservation, and resource regeneration has intensified. From the perspective of resources and energy, it is urgent for us to switch from limited fossil resources to renewable biological resources as soon as possible, so as to get rid of the extreme dependence on oil as soon as possible. Therefore, countries around the world are making great efforts to research and develop biological resources and bio-energy, and develop and utilize various biological resource products. Biodegra...

Claims

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Application Information

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IPC IPC(8): C08G81/00
Inventor 刘吉顾群蒋志强黎俊徐悦周坚王静
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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