Characteristics of the phase transition of poly(siloxane/ether urethane) copolymers

Hung Yi Tsi, Chien Chung Chen, Wen Chin Tsen, Yao Chi Shu, Fu Sheng Chuang

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12 Citations (Scopus)

Abstract

The aim of this study is to investigate the characteristics of the phase transition for poly(siloxane/ether urethane) copolymers (PSi-EUs) consisting of PTMG/PDMS mixed soft segments and urethane hard segments by differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). PSi-EUs exhibit three regions of amorphous phase transition, involving the PDMS soft phase, the PTMG soft phase and the urethane hard phase; therefore, they display phase separation due to low miscibility. Intermolecular hydrogen bonding, which is key to phase mixing, hence resulting in a low degree of phase separation, occurs between the PTMG soft segments in the PTMG/PDMS mixed soft phase and the urethane hard segments. Accordingly, the PSi-EUs are superior to poly(siloxane urethane) copolymer (PSiU) in terms of tensile strength due to the low phase separation and strain-induced crystallization resulting from PTMG soft segments.

Original languageEnglish
Pages (from-to)50-59
Number of pages10
JournalPolymer Testing
Volume30
Issue number1
DOIs
Publication statusPublished - Feb 2011

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Keywords

  • DMA
  • DSC
  • Mixed soft segment
  • Phase transition
  • Poly(siloxane/ether urethane)

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

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