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

Translated title of the contribution: Preparation and Melt Stability of PLA-PCL Multi-block Stereocomplex Film

Yue Chang, Zhize Chen, Yiqi Yang

Research output: Contribution to journalArticle

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.

Original languageChinese
Pages (from-to)2808-2812
Number of pages5
JournalCailiao Daobao/Materials Reports
Volume33
Issue number8
DOIs
StatePublished - Aug 25 2019

Fingerprint

Acids
Melting
Enantiomers
Crystallites
Block copolymers
Processing
Plastic films
poly(lactic acid)
Calorimeters
Tensile properties
Molding
Toughness
Raw materials
Diffraction
Crystallization
Molecular weight
Scanning
Recovery
X rays
Defects

Keywords

  • Melt stability
  • Multi-block copolymer
  • Polylactic acid stereocomplex
  • Toughening

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

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. / Chang, Yue; Chen, Zhize; Yang, Yiqi.

In: Cailiao Daobao/Materials Reports, Vol. 33, No. 8, 25.08.2019, p. 2808-2812.

Research output: Contribution to journalArticle

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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.",
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