Effects of top confinement and diluents on morphology in crystallization of poly(l -lactic acid) interacting with poly(ethylene oxide)

Eamor Woo, Graecia Lugito, Jia Hsuan Tsai

研究成果: Article

9 引文 斯高帕斯(Scopus)

摘要

Effects of top confinement and diluent poly(ethylene oxide) (PEO) on poly(l-lactic acid) (PLLA) crystal morphology have been investigated. When crystallized at 120 °C, uncovered neat PLLA sample exhibits higher growth rate ringless spherulites; while the covered sample exhibits lower growth rate ring-banded spherulites. As PEO is introduced into PLLA, the morphology also undergoes significant changes. For the same Tc,PLLA=120 °C, the PEO/PLLA blend with PEO composition greater than 25% exhibits ring-banded patterns even in uncovered sample. However, in much greater PEO composition (>80 wt %), uncovered samples exhibit ring bands diverging into dendritic patterns, while top covered samples tend to maintain the spiral ring-band patterns. Both PEO inclusion in PLLA and top cover on films impose growth kinetic alterations. Additionally, the top glass cover tends to prevent the lower surface tension PLLA to be accumulated on the surface, resulting in the formation of ring-band pattern.

原文English
頁(從 - 到)1160-1170
頁數11
期刊Journal of Polymer Science, Part B: Polymer Physics
53
發行號16
DOIs
出版狀態Published - 2015 八月 15

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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