Amorphous phase behavior and crystalline morphology in blends of poly(vinyl methyl ether) with isomeric polyesters: Poly(hexamethylene adipate) and poly(e-caprolactone)

Eamor M. Woo, Ying Hsuan Chou, Wan Jing Chiang, I. Tzu Chen, I. Han Huang, Nai Tzu Kuo

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Two isomeric polyesters, poly(1,6-hexamethylene adipate) (PHA) and poly(-caprolactone) (PCL), were each blended with amorphous poly(vinyl methyl ether) (PVME) and investigated and compared in the crystalline and amorphous phases. The amorphous phase, T g, and crystalline morphology of the PVME/PHA blend were compared with those of classical PVME/PCL. Both blend systems exhibit a similar peculiar asymmetry with positive deviation in T g -composition relationships, and both are similarly miscible, with the PVME/PHA blend exhibiting 12 0.21; for PVME/PCL, 12 0.20. These values indicate that both blends are similarly miscible but have only quite weak interactions in the amorphous phase. Neat PHA shows a regime-I to -II transition, but neat PCL exhibits a regime-II to -III transition. On blending with PVME (at 20 wt%), both PVME/PCL and PVME/PHA blends undergo changes in crystallization temperature (T c). Dendritic spherulites in the high-T c (46°C or above)-crystallized PVME/PHA blend assume a straight-stalk pattern (chrysanthemum flower pestles or banana stems). In contrast to the similarities in amorphous-phase miscibility, the crystalline phases of these two blends differ significantly. When crystallized at high T c (46 °C or above), the PVME/PCL (20/80) blend assumes a fluffy feather-like dendritic pattern, which is dramatically different from the straight-stalk dendrites in the PVME/PHA (20/80) blend.

Original languageEnglish
Pages (from-to)391-400
Number of pages10
JournalPolymer Journal
Volume42
Issue number5
DOIs
Publication statusPublished - 2010 May

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Materials Chemistry

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