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A kind of biodegradable multi-block copolymer and preparation method thereof

A multi-block copolymer, biodegradable technology, applied in the field of biodegradable multi-block copolymer and its preparation, can solve the problems of high cost and lack of chain flexibility

Active Publication Date: 2014-10-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using PBS or PES as the soft segment, the chain flexibility is still lacking; using PCL as the soft segment, the cost is too high

Method used

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  • A kind of biodegradable multi-block copolymer and preparation method thereof
  • A kind of biodegradable multi-block copolymer and preparation method thereof
  • A kind of biodegradable multi-block copolymer and preparation method thereof

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0057] Because the preparation method proposed by the present invention has the above-mentioned characteristics and advantages, the biodegradable multi-block copolymer obtained has a high molecular weight, contains not only ester groups and urethane groups, but also contains amide groups, so the cohesive energy is high, and the thermal and mechanical properties are excellent. Excellent performance, high thermal stability and low cost.

[0058] The structure and properties of the biodegradable multi-block copolymer prepared by the present invention can be adjusted in a wide range, and when the soft segment content of the copolyester is lower than 50wt%, it has excellent crystallinity, tensile strength and modulus and impact strength, it can be used as a toughened polylactic acid plastic; when the copolyester soft segment content is higher than 50wt%, it has high elongation at break and elasticity, and can be used as a thermoplastic elastomer.

[0059] Test method 1:

[0060] M...

Embodiment 1

[0067]In the presence of an organic sulfonic acid catalyst, the L-lactic acid monomer is melt-condensed at 160°C for 2 hours to obtain a polylactic acid prepolymer with a degree of polymerization of 50 and a molecular weight of 3600 g / mol. The amount of the organic sulfonic acid catalyst is the mass of L-lactic acid 0.05% of the polylactic acid prepolymer; then add 0.1% polylactic acid prepolymer crystallization nucleating agent talc powder, mix uniformly, and obtain a polylactic acid prepolymer containing a crystallization nucleating agent with a molecular weight of 3600g / mol.

Embodiment 2

[0069] In the presence of an organic sulfonic acid catalyst, the L-lactic acid monomer is melt-condensed at 200°C for 6 hours to obtain a polylactic acid prepolymer with a degree of polymerization of 250 and a molecular weight of 18,000 g / mol. The amount of the organic sulfonic acid catalyst is the mass of L-lactic acid 1% of 1% of the polylactic acid prepolymer; then add montmorillonite crystallization nucleating agent 2% of the mass of the polylactic acid prepolymer, and mix uniformly to obtain a polylactic acid prepolymer containing a crystallization nucleating agent with a molecular weight of 18000g / mol.

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Abstract

The invention discloses a biodegradable multiblock polymer and a preparation method thereof. The multiblock polymeris comprises 5-95wt% of a polylactic acid dimer hard segment, 5-95wt% of a copolyester soft segment and a connection segment, and can optionally comprise 0.1-2wt% of a polylactic acid crystallization nucleating agent. Firstly, a polylactic acid prepolymer is prepared by melt polycondensation of L-lactic acid in presence of an organic sulfonic acid and the optional crystallization nucleating agent; then the prepolymer is subjected to a reaction with bisoxazoline to prepare a hydroxyl-terminated polylactic acid dimer; and finally, the dimer is subjected to a reaction with copolyester diol and diisocyanate to obtain the biodegradable multiblock polymer. The biodegradable multiblock polymer has high molecular weight and excellent thermal and mechanical properties. Besides, the mechanical properties can be adjusted in an extremely wide range. The biodegradable multiblock polymer can be used for toughening polylactic acid plastics, fibers or thermoplastic elastomers. The method is simple and efficient, and is short in reaction time of each step, so that the cost of a final product is relatively low; and the method is beneficial to application and popularization.

Description

technical field [0001] The invention relates to a compound and a preparation method thereof, in particular to a biodegradable multi-block copolymer and a preparation method thereof. Background technique [0002] Biodegradable polymers have good biodegradability and biocompatibility, and have broad application prospects in the fields of degradable plastics, fibers, elastomers and biomedical materials, and have received more and more attention. Polylactic acid is an important biodegradable aliphatic polyester with good biocompatibility and high tensile modulus and strength. However, polylactic acid also has disadvantages such as poor impact resistance, low heat resistance, and high cost, and its application is limited. It is still an important challenge in the field of biodegradable polymers to strengthen the synthesis process, improve performance and reduce costs through chemical or physical methods such as copolymerization, blending, and filling, and even synthesize new hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/42C08G18/32
Inventor 吴林波曾小青吴彬霜徐煜韬
Owner ZHEJIANG UNIV