A new crystal morphology of straight-stalk dendrites in blends of poly(butylene adipate) with amorphous poly(vinyl acetate)

E. M. Woo, Chao Shun Chang, Ming Chien Wu

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6 Citations (Scopus)

Abstract

Discontinuity in crystallization rates and a new and unusual morphology consisting of thickened straight-stalks crystal lamellae with also straight branches radiating out from a common nucleus were observed in blends of poly(vinyl acetate) (PVAc) with poly(1,4-butylene adipate) (PBA). The discontinuity in the crystal growth and mechanisms of straight-dendrite morphology of the PVAc/PBA blends were analyzed using polarized-light optical microscopy (POM), differential scanning calorimetry (DSC), and wide-angle X-ray diffraction (WAXD). The discontinuity in crystallization rate and dendritic morphology occurred only at or near PVAc/PBA 10/90 blend composition upon crystallization at high-temperature regimes of Tc = 30-33 °C. By comparison, when crystallized at the same temperatures, PVAc/PBA blends of amorphous polymer loading greater than 15% or the neat PBA (amorphous polymer loading = 0) developed no dendrites but only typical Maltese-cross spherulites. Mechanism of straight dendrites in the blends is preliminarily expounded. Detailed interpretation requires further analyses.

Original languageEnglish
Pages (from-to)3542-3546
Number of pages5
JournalMaterials Letters
Volume61
Issue number16
DOIs
Publication statusPublished - 2007 Jun

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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