The effect of compatibilization and rheological properties of polystyrene and poly(dimethylsiloxane) on phase structure of polystyrene/poly(dimethylsiloxane) blends

C. Z. Chuai, S Li, Kristoffer Almdal, Jan Alstrup, Jørgen Lyngaae-Jørgensen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The compatibilization effect of polystyrene (PS)-poly(dimethylsiloxane) (PDMS) diblock copolymer (PS-b-PDMS) and the effect of rheological properties of PS and PDMS on phase structure of PS/PDMS blends were investigated using a selective extraction technique and scanning electron microscopy (SEM). The dual-phase continuity of PS/PDMS blends takes place in a wide composition range. The formation and the onset of a cocontinuous phase structure largely depend on blend composition, viscosity ratio of the constituent components, and addition of diblock copolymers. The width of the concentration region of the cocontinuous structure is narrowed with increasing the viscosity ratio of the blends and in the presence of the small amount diblock copolymers. Quiescent annealing shifts the onset values of continuity. The experimental results are compared with the volume fraction of phase inversion calculated with various theoretical models, but none of the models can account quantitatively for the observed data.
Original languageEnglish
JournalJournal of Polymer Science. Part B, Polymer Physics
Volume42
Issue number5
Pages (from-to)898-913
ISSN0887-6266
DOIs
Publication statusPublished - 2004

Keywords

  • Polymer blends
  • Compatibilization
  • Block copolymers
  • Morphology
  • Phase behavior

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