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

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1160-1170
Number of pages11
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume53
Issue number16
DOIs
Publication statusPublished - 2015 Aug 15

All Science Journal Classification (ASJC) codes

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

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