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Preparation method for high molecular weight polylactic acid steric composite

A technology of stereocomplex and high molecular weight, which is applied in the field of polymer materials, can solve the problems of high cost, complicated post-processing, low yield, etc., and achieve the effect of improving heat resistance, simple and feasible process, and improving heat resistance

Active Publication Date: 2012-07-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of solution preparation is easy to operate, but the post-treatment is more complicated, the cost is higher, the yield is lower, and it is not easy for large-scale industrial production
[0006] At the same time, when the solution preparation and melt blending methods are used, due to its limitation on the molecular weight of polylactic acid, the stereocomplex prepared by low molecular weight polylactic acid is brittle, which limits the application range of polylactic acid stereocomplex

Method used

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  • Preparation method for high molecular weight polylactic acid steric composite
  • Preparation method for high molecular weight polylactic acid steric composite
  • Preparation method for high molecular weight polylactic acid steric composite

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The poly-L-lactic acid and poly-D-lactic acid resins with a weight ratio of 50:50 were blended in a torque rheometer, the blending temperature was 140°C, the rotation speed was 40r / min, and the blending time was 15min. The resin was not plasticized during the preparation process, and the obtained sample was heated to 250°C by differential scanning calorimetry (DSC) at 10°C / min to melt. The results are shown in Table 1 and figure 1 .

Embodiment 2

[0030] The poly-L-lactic acid and poly-D-lactic acid resins with a weight ratio of 50:50 were blended in a torque rheometer, the blending temperature was 180°C, the rotation speed was 40r / min, and the blending time was 15min. The resin was not plasticized during the preparation process, and the obtained sample was heated to 250 °C by DSC at 10 °C / min to melt. The results are shown in Table 1 and figure 1 .

Embodiment 3

[0032] The poly-L-lactic acid and poly-D-lactic acid resins with a weight ratio of 50:50 were blended in a torque rheometer, the blending temperature was 210°C, the rotational speed was 40r / min, and the blending time was 15min. The resin was not completely plasticized during the preparation process, and the obtained sample was heated to 250°C by DSC at 10°C / min to melt. The results are shown in Table 1 and figure 1 .

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Abstract

The invention discloses a preparation method for a high molecular weight polylactic acid steric composite. The preparation method comprises the following steps: mixing poly-levo-lactic acid and poly-dextro-lactic acid according to the weight ratio of 80:20 to 20:80; and mixing the mixture in a torque rheometer at the temperature of between 140 and 210 DEG C and at the mixing rotating speed of 10 to 120 r / min for 1 to 60 minutes so as to prepare the high molecular weight polylactic acid steric composite. The polylactic acid is not plastified or not completely plastified at the mixed temperature; and strong interaction occurs between the molecular chains of poly-levo-lactic acid and poly-dextro-lactic acid which are not plastified or not completely plastified, so that high-content even total-content steric composite is formed in the high molecular weight polylactic acid. Compared with the conventional method, the preparation method has the advantages of simplicity, high efficiency, wide application values of products and the like.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a preparation method of a high-molecular-weight polylactic acid stereocomplex. Background technique [0002] Since the beginning of the 21st century, the problems of plastic pollution and petrochemical resources have become the focus of worldwide attention. The sustainable development of biodegradable polymer materials using biomass and natural resources as raw materials has become a research and application development direction that has attracted worldwide attention. [0003] Polylactic acid (PLA) is currently the most widely used variety of synthetic biodegradable polymer materials, and it will gradually partially replace polyolefins and be widely used in the field of general plastics. However, some properties of polylactic acid itself need to be improved. For example, the heat resistance of polylactic acid is poor, and the heat distortion temperature of polylactic a...

Claims

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Application Information

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IPC IPC(8): C08L67/04
Inventor 杨伟包睿莹蒋文柔刘正英谢邦互杨鸣波
Owner SICHUAN UNIV
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