Lamellar assembly and orientation-induced internal micro-voids by cross-sectional dissection of poly(ethylene oxide)/poly(L-lactic acid) blend

Y. T. Hsieh, E. M. Woo

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Micro-lamellar patterns and orientation-induced micro-voids (cracks) in spherulites are probed in step-crystallized blends of two crystalline polymers: poly(ethylene oxide) (PEO) and low-molecular-weight poly(L-lactic acid) (PLLA) in different weight fractions, using polarizing light optical microscopy (POM), and scanning electron microscopy (SEM) with water-etching technique. It is revealed that blend composition led to entirely different PLLA lamellar regularities and void patterns. Water-etching into interiors of PEO/PLLA blends show 3D assembly of PLLA lamellae patterns. It is an important datum for structure modeling of banded polymer spherulites in bulk state. The mechanisms for the void/crack patterns and lamellar orientation are exemplified via dissecting into interior spherulites of bulk-form samples.

Original languageEnglish
Pages (from-to)396-405
Number of pages10
JournalExpress Polymer Letters
Volume7
Issue number4
DOIs
Publication statusPublished - 2013 Apr

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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