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Flexible modified method for poly beta-hydroxybutyric butyrate and poly beta-hydroxybutyric butyrate-beta hydroxyl valerate

A technology of hydroxybutyrate and hydroxyvalerate, which is applied in the field of modification of polyester biodegradable materials, can solve the problems of high brittleness and poor mechanical properties, and achieve the effects of stable performance, excellent performance and good comprehensive performance.

Inactive Publication Date: 2007-10-03
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

Aiming at the problems of high brittleness and poor mechanical properties of poly-β-hydroxybutyrate and poly-β-hydroxybutyrate-β-hydroxyvalerate, the present invention adopts dynamic co-crosslinking technology and proposes an improved processing technology. A PHBV modified material with excellent toughness was prepared by a unique method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0017] Poly-β-hydroxybutyrate or poly-β-hydroxybutyrate-β-hydroxyvalerate and polybutylene succinate were vacuum-dried at 50°C for 24 hours, and then added to the Melt blending was carried out in an internal mixer, the blending temperature was 175°C, and the rotor speed was 40 rpm. After blending for 4 minutes, the crosslinking agent DCP was added according to the formula in Table-1, and dynamic co-crosslinking was carried out for 2 minutes. PHB and PHBV toughened modified materials are obtained.

[0018] After the modified material test sample was parked in an environment of 23°C for 24 hours, its performance was tested. The tensile properties were tested on the universal electronic tensile machine (Instron 4465) according to the ISO.178 standard, the test temperature was 23°C, and the tensile rate was 10mm / min; the notched impact strength was tested on the impact tester (RAY-RANTest Equipment Ltd.) according to the ASTM D256 standard ., UK) at a test temperature of 23°C; th...

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Abstract

This invention relates to a toughness modify method of e. Poly-beta-hydroxybutyric acid ester and poly-beta-hydroxybutyric acid ester-beta-hydroxy valerate and poly- succinic acid butanediol ester or poly- lactic acid carry out vacuum drying, then according to a certainty weight proportion add to Banbury mixer for fusion and blending, after several minutes, add cross-linking agent to carry out dynamic co crosslinking. This materials breaking elongation rate can reach 425%, fracture strength can reach 33.5 MPa, notch impact strength reach 64 joule / m.

Description

technical field [0001] The invention relates to a method for modifying polyester biodegradable materials, in particular to a method for toughening modification of poly-β-hydroxybutyrate and poly-β-hydroxybutyrate-β-hydroxyvalerate. Background technique [0002] Poly-β-hydroxybutyrate (PHB) and poly-β-hydroxybutyrate-β-hydroxyvalerate (PHBV) are thermoplastic aliphatic polyester materials produced by bacterial fermentation for carbon source and energy storage, with Good biodegradability and biocompatibility, good gas barrier and temperature resistance. The PHB and PHBV obtained by the biological fermentation method have high purity and tacticity, so they are easy to crystallize, have high crystallinity, and have large crystal size and crystal growth rate. However, during the melting and cooling process, the PHBV spherulites have different shrinkage coefficients in the radius and circumferential directions, resulting in cracks inside the large spherulites. When the material i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08J3/24C08K5/14
Inventor 马丕明王帅王仕峰王如寅张勇张隐西
Owner SHANGHAI JIAO TONG UNIV
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