• 제목/요약/키워드: Im Won jun

검색결과 332건 처리시간 0.024초

Thermal and Mechanical Properties of Polyurethanes based on Novel Chain Extender

  • Lee Dong-Won;Kim Won-Gi;Park Jun-Ho;Im Sang-Gyu;Son Tae-Won
    • 한국섬유공학회:학술대회논문집
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    • 한국섬유공학회 1998년도 가을 학술발표회논문집
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    • pp.66-69
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    • 1998

  • Most segmented polyurethanes are prepared from a two-step method where the polyol is end-capped with an excess of diisocyanate, followed by chain extension with stoichiometric amount of chain extender, In the final polymer the hard and soft segments tend to segregate, due to thermodynamic immiscibility and the differences in chemical structure between hard and soft segments, and produce a phase separated morphology of hard segment-rich and soft segment-rich phase. (omitted)

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