Toughening method of poly(3-hydrox butyrate) and poly(3-hydroxy butyrate-3-hydroxy pentanoate)

A technology of hydroxybutyrate and hydroxyvalerate, used in the toughening field of poly and poly, can solve problems such as poor mechanical properties

Inactive Publication Date: 2003-05-14
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at the core problem of poor mechanical properties of PHB and PHBV with low HV content, the present invention proposes a toughening method that is convenient for processing, and uses widely available raw materials to prepare PHB or PHBV materials with excellent toughness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1 PHBV (PHBV5) with a molar content of HV monomer of 5% was kneaded in an internal mixer at about 171°C for 6 minutes at a speed of 25 rpm. The obtained material has the following mechanical performance characterization results: Young's modulus is 1220MPa, yield strength is 30.6MPa, tensile strength is 25.0MPa, and elongation at break is 4.5%. The melting point is 174°C.

Embodiment 2

[0020] Example 2 PHBV5 and bisphenol A (BPA) were mixed in the following ratio: 90:10, first mixed in a high-speed mixer, and then mixed in an internal mixer at about 171°C for 6 minutes at a speed of 25 rpm. The obtained material has the following mechanical property characterization results: Young's modulus is 865 MPa, yield strength is 32.5 MPa, tensile strength is 27.6 MPa, and elongation at break is 41%. The melting point is 164°C.

Embodiment 3

[0021] Example 3 PHBV5 and BPA were mixed according to the following ratio: 80 / 20, first mixed in a high-speed mixer, and then mixed in an internal mixer at about 171°C for 6 minutes at a speed of 25 rpm. The obtained material has the following mechanical property characterization results: the Young's modulus is 751 MPa, the yield strength is 22.3 MPa, the tensile strength is 11.7 MPa, and the elongation at break is 220%. The melting point is 158°C.

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Abstract

The present invention relates to a toughening method of poly(3-hydroxy butyrate) and poly(3-dydroxy butyrate-3-hydroxy pentanoate). The raw material includes the first component of poly(3-hydroxy butyrate) or poly(3-dydroxy butyrate-3-hydroxy pentanoate) with 3-hydroxy pentanoate monomer molar content less than 20%; the second copmonent of p-tert-butylphenol, bisphenol A, bisphenol S or 2,4,6-tri(2'-hydroxy-4'-butoxyphenyl)-1,3,5- triazine; and the optional component including plasticizer and stuffing. The weight ratio between the first component and the second component is 70-90 to 10-30 andthe optional component is 0-30 wt% of the first component. By means of solution blending or melting blending, modified material with excellent toughness may be obtained.

Description

technical field [0001] The invention belongs to the toughening method of poly(3-hydroxybutyrate) and poly(3-hydroxybutyrate-3-hydroxyvalerate). Background technique [0002] Both poly(3-hydroxybutyrate) (PHB) and poly(3-hydroxybutyrate-3-hydroxyvalerate) (PHBV) are aliphatic polyesters synthesized by bacterial fermentation and have many excellent properties. For example, satisfactory biocompatibility and biodegradability, good air tightness and resistance to ultraviolet radiation. From the perspective of molecular structure, PHB adopts the method of biosynthesis, and the obtained polymer structural units are all right-handed, and the molecular chain has high stereoregularity. Compared with other polyesters, they are easy to crystallize and have high crystallinity, and the obtained spherulite size is also large. However, in these rapidly formed large spherulites, due to the difference in expansion coefficient and the internal stress generated by temperature changes, cracks ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K5/3492C08L67/04
Inventor 费宾董丽松陈成吴航
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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