Relationship between conformation and molecular motion of soft segment in polyurethane elastomers under elongation

Ken Kojio, Suguru Motokucho, Mutsuhisa Fumkawa

研究成果: 会議への寄与タイプ学会誌査読

抄録

In this study, the molecular aggregation state and molecular motion of the poly(oxypropylene) glycol (PPG), 1,4-butane diol and 4,4'-diphenylmethane diisocyanate (MDI) based polyurethane elastomers were investigated using dynamic viscoelastic measurement under elongation. Two PPGs with different molecular weight (Mn=2000 and 4000) were employed for the preparation of the PUEs. The peaks assigned to a relaxation of the PPG were clearly observed in the loss tangent (tan δ) curves at various strains. The onset temperature of these peaks decreased with an increasing strain. This result indicates that the size of corporate motion of glass transition decreased due to the orientation of the soft segment chains with an increasing strain. Also, the amount of temperature shift of 2000 molecular weight PPG-based PUEs were larger than that for 4000 one. This is correlated to the phase separation state of the PUEs.

本文言語英語
ページ3377-3378
ページ数2
出版ステータス出版済み - 2005
外部発表はい
イベント54th SPSJ Symposium on Macromolecules - Yamagata, 日本
継続期間: 9月 20 20059月 22 2005

その他

その他54th SPSJ Symposium on Macromolecules
国/地域日本
CityYamagata
Period9/20/059/22/05

!!!All Science Journal Classification (ASJC) codes

  • 工学一般

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