聚乳酸-聚己内酯多嵌段立构复合物薄膜的制备及熔融稳定性

doi:10.11896/cldb.19010073

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Abstract The environmentally friendly polylactic acid (PLA) film is widely applied in diverse sectors as a substitute of the traditional plastic film. Howe-ver, there are intrinsic flaws in PLA, especially its great possibility to degrade during processing, which make the processing of PLA difficult. For the sake of enhancing the toughness and melt stability of polylactic acid stereocomplex (sc-PLA), the enantiomers of PLA multi-block copolymers with the same molecular weight were synthesized, taking L-lactide, D-lactide and poly(ε-caprolactone) diol (PCL-diOH) as raw materials. Then, the stereocomplex films of the multi-block copolymers (sc-PLCL/PDCD) were prepared by hot-press molding after uniformly mixing the enantiomers. The results of differential scanning calorimeter (DSC) indicated that the sc-PLCL/PDCD exhibited satisfactory melting stability, and the recovery rate of stereo-crystallites after recrystallization exceeded 97%. The test of wide angle X-ray polycrystalline diffraction (WXRD) de-monstrated that only stereo-crystallites existed in the hot pressed film. Besides, the stereocomplex film prepared by this approach was capable of introducing various flexible segments with diol end groups into the PLA chiral molecular chain, so as to rapidly prepare sc-PLA with excellent tensile properties and melting stability, being adapted to melting processing.

Key words： polylactic acid stereocomplex melt stability toughening multi-block copolymer

Published: 12 July 2019

CLC number:

O632

Fund:This work was financially supported by the National Natural Science Foundation Youth Fund of China (51503029).

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	CHANG Yue
	CHEN Zhize
	YANG Yiqi 1

Cite this article:

CHANG Yue,CHEN Zhize,YANG Yiqi 1. Preparation and Melt Stability of PLA-PCL Multi-block Stereocomplex Film[J]. Materials Reports, 2019, 33(16): 2808-2812.

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http://www.mater-rep.com/EN/10.11896/cldb.19010073 OR http://www.mater-rep.com/EN/Y2019/V33/I16/2808

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