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Unsaturated aliphatic-polylactic acid segmented copolymer and preparation method thereof

A technology of block copolymer and aliphatic polyester, which is applied in the field of unsaturated aliphatic-polylactic acid block copolymer and its preparation, can solve the problems that the elongation at break can only reach 60% and poor mechanical properties, etc. Achieve good mechanical properties, reduce brittleness, and reduce pollution

Active Publication Date: 2014-05-21
普立思生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The degradable polylactic acid diblock copolymer has good compatibility with polylactic acid resin, but its mechanical properties are poor, and the elongation at break can only reach 60%.

Method used

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  • Unsaturated aliphatic-polylactic acid segmented copolymer and preparation method thereof
  • Unsaturated aliphatic-polylactic acid segmented copolymer and preparation method thereof
  • Unsaturated aliphatic-polylactic acid segmented copolymer and preparation method thereof

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preparation example Construction

[0049] The invention provides a kind of preparation method of unsaturated aliphatic-polylactic acid block copolymer, comprises the following steps:

[0050]a) performing esterification reaction and polycondensation reaction on saturated dicarboxylic acid compound, saturated dihydric alcohol compound and unsaturated compound to obtain unsaturated aliphatic polyester in molten state;

[0051] The saturated dicarboxylic acid compound is one or more of saturated dicarboxylic acids and saturated dicarboxylic acid derivatives;

[0052] The unsaturated compound is a dibasic carboxylic acid compound containing a double bond or a dibasic alcohol compound containing a double bond;

[0053] b) Under an oxygen-free environment, the molten unsaturated aliphatic polyester and lactide obtained in step a) are polymerized to obtain unsaturated aliphatic-polylactic acid having a structure shown in formula (I) block copolymers;

[0054]

[0055] In formula (I), m=5~200, n=5~200, p=10~500; ...

Embodiment 1

[0111] The 2L reaction kettle with four vents was repeatedly evacuated and nitrogen-filled to cool, and then 400g of succinic acid, 600g of butanediol, 312g of maleic anhydride and 0.7g of tetrabutyl titanate were mixed with nitrogen. After the esters are added to the reaction kettle in turn, the temperature of the reaction kettle is raised to 140°C and the reactants are stirred, and the water generated by the reaction is collected at the same time. When the temperature of the system reaches 210° C., the pressure is gradually reduced to a high vacuum state. When the pressure is 250 Pa, the polycondensation reaction is carried out for 3 hours to obtain polybutylene succinate-butylene maleate in a molten state.

[0112] The present invention carries out gel permeation chromatography analysis to the obtained copolymer according to the test technical scheme described in the above-mentioned technical scheme, and the relative number-average molecular weight of the obtained polybutyle...

Embodiment 2

[0120] Get polybutylene succinate-butylene maleate copolymer 100g in embodiment 1, add the dry lactide of 200g and 0.2g stannous octoate (Sn(Otc) wherein 2 ), and then react the obtained mixture at 120°C, the reaction is shown in formula (a), this reaction adopts bulk polymerization, after 8h, the temperature is raised to 180°C, the unreacted monomer is removed by vacuuming, and the pressure is 250Pa, to obtain Melted polybutylene succinate-butylene maleate-polylactic acid block copolymer.

[0121]

[0122] In formula (a), m=5-200, n=5-200, p=10-500.

[0123] The present invention carries out gel permeation chromatography analysis to the obtained copolymer according to the test technical scheme described in the above technical scheme, and the obtained molten polybutylene succinate-butylene maleate-polylactic acid embedding The relative number average molecular weight of the segment copolymer was 23.0 kg / mol, and the relative molecular weight distribution was 1.58.

[0124...

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Abstract

The invention provides an unsaturated aliphatic-polylactic acid segmented copolymer with a structure shown in a formula (I) in specification. The unsaturated aliphatic-polylactic acid segmented copolymer with the structure shown in the formula (I) comprises the structure of a long-chain unsaturated aliphatic polyester, and the structure of the long-chain unsaturated aliphatic polyester is flexible so that the brittleness of the unsaturated aliphatic-polylactic acid segmented copolymer is reduced and the unsaturated aliphatic-polylactic acid segmented copolymer has better mechanical properties; besides, the structure also provides a modifiable structure chain for the unsaturated aliphatic-polylactic acid segmented copolymer, and the structure chain comprises a re-modifiable and high-reaction-activity vinyl group so that free radical polymerization or cross-linking reaction can be carried out, and therefore, the mechanical strength is enhanced to meet requirements of various uses. The elongation at break of the unsaturated aliphatic-polylactic acid segmented copolymer reaches 400%.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis, and in particular relates to an unsaturated aliphatic-polylactic acid block copolymer and a preparation method thereof. Background technique [0002] With the intensification of environmental pollution, people put forward higher requirements for the use of polymer materials. While meeting the performance of materials, polymer materials are required to be non-polluting to the environment. Polylactic acid is a biodegradable green polymer material based on biomass resources. It is non-toxic, non-irritating, and has good biocompatibility and bioabsorbability. However, polylactic acid contains a large number of ester bonds and is hydrophilic. Poor resistance reduces the biocompatibility of polylactic acid and other substances. Polylactic acid itself is a linear polymer with low melt strength, high brittleness and poor impact resistance, which limits its wide use. [0003] Aiming at the abov...

Claims

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Application Information

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IPC IPC(8): C08G63/00C08G63/78
Inventor 张宝边新超孙敬茹李杲陈学思
Owner 普立思生物科技有限公司
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