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.
| Translated title of the contribution | Preparation and Melt Stability of PLA-PCL Multi-block Stereocomplex Film |
|---|---|
| Original language | Chinese |
| Pages (from-to) | 2808-2812 |
| Number of pages | 5 |
| Journal | Cailiao Daobao/Materials Reports |
| Volume | 33 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 25 2019 |
Keywords
- Melt stability
- Multi-block copolymer
- Polylactic acid stereocomplex
- Toughening
ASJC Scopus subject areas
- Materials Science(all)