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Polylactic acid material with high stereocomplex crystal content and high molecular weight, and preparation method thereof

A polylactic acid material and a technology of stereocompositing, which is applied in the field of high molecular polymer materials, can solve the problems of poor stereo crystallization ability and weak crystal properties of left and right polylactic acid, and achieve the improvement of content and crystallization rate, low production cost, The effect of good compatibility

Active Publication Date: 2019-04-19
JIANGSU UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of poor stereo crystallization ability and weak crystal performance of left-handed polylactic acid with large molecular weight, the present invention provides a high molecular weight polylactic acid material with high stereocomplex crystal content and its preparation method

Method used

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  • Polylactic acid material with high stereocomplex crystal content and high molecular weight, and preparation method thereof

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preparation example Construction

[0022] The preparation method of the present invention comprises the following steps: Step 1, preparatory work: Weigh a certain amount of L-polylactic acid and D-polylactic acid and place them in a clean container, measure a certain amount of chloroform liquid, and divide it into three parts , weigh a certain amount of epoxy resin and amine curing agent and put them into clean containers respectively;

[0023] Step 2, preparation of the polylactic acid blend: dissolve the weighed L-polylactic acid and D-polylactic acid in one part of the chloroform liquid, stir with a magnetic stirrer for 5-8min, and the rotation speed is 200rpm;

[0024] Step 3, preparing epoxy resin solution: dissolving epoxy resin in the second part of chloroform liquid to prepare 1-3% epoxy resin solution;

[0025] Step 4, prepare the curing agent solution: configure the amine curing agent solution in another part of chloroform liquid to form a 0.05% to 0.6% curing agent solution;

[0026] Step 5, fully m...

Embodiment 1

[0028] The mass percentage of each component is: 5% of L-polylactic acid, 5% of D-polylactic acid, 2% of epoxy resin, 0.1% of diethylenetriamine, and 87.9% of chloroform.

Embodiment 2

[0030] The mass percentage of each component is: 5% of L-polylactic acid, 5% of D-polylactic acid, 2% of epoxy resin, 0.2% of diethylenetriamine, and 87.8% of chloroform.

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Abstract

The invention discloses a polylactic acid material with a high stereocomplex crystal content and a high molecular weight, and a preparation method thereof. The polylactic acid material is prepared from, by mass, 2-6% of poly-L-lactic acid, 2-6% of poly-D-lactic acid, 1-3% of epoxy resin, 0.05-0.6% of an amine curing agent and 84.4-94.95% of trichloromethane. Compared with the prior art, the methodhas the advantages of simple process in block copolymerization, chain chemical topology design and crystallization condition control, and low production cost.

Description

technical field [0001] The invention relates to the field of high molecular polymer materials, in particular to a high molecular weight polylactic acid material with high stereocomplex crystal content and a preparation method thereof. Background technique [0002] Poly(lactic acid), PLA, a biodegradable polyester material derived from renewable resources, has always been the focus of polymer research and application. In 1987, Ikada et al first reported the stereocomplex (Stereocomplex) formed by blending poly(L-lactic acid), PLLA and poly(D-lactic acid), PDLA. crystal, SC), its melting point is nearly 50 ℃ higher than the homogeneous crystal (Homocrystal, HC) formed by PLLA (or PDLA). Due to higher thermal stability and better mechanical properties, stereocomplex crystals are becoming a prominent research focus in the field of polylactic acid, and the application range of this biodegradable material will also be significantly expanded. [0003] However, affected by factors...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L63/00
CPCC08L67/04C08L2205/025C08L2205/03C08L63/00
Inventor 李照磊郭伟杰周海骏叶鑫鑫赵宣宣曾瑜
Owner JIANGSU UNIV OF SCI & TECH
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