Polyurethane gels (PUGs) were synthesized from poly (oxypropylene) glycol (PPG) (M̄n=2000, 4000 and 8000) and lysine triisocyanate (LTI). To control the number of dangling chains in the PUGs, with the ratio of K=[NCO]/[OH] was varied. The glass transition temperature of PPG in the PUGs (Tg,PUG) was observed at around -60 °C by differential scanning calorimetry (DSC). The difference temperature of the glass transition temperature of PPG (Tg,PPG) and Tg,PUG(ΔTg) was decreased with an increase in molecular weight for PPG and a decrease in K. In the tan δ curve, different relaxation that can be attributed to the motion of the dangling chain was observed in the higher temperature side of α-relaxation. These all results are related to the formation of incomplete network structure due to the decrease in K, which can act as a dangling chain.
|ホスト出版物のタイトル||55th SPSJ Symposium on Macromolecules|
|出版ステータス||出版済み - 2006|
|イベント||55th Society of Polymer Science Japan Symposium on Macromolecules - Toyama, 日本|
継続期間: 9 20 2006 → 9 22 2006
|その他||55th Society of Polymer Science Japan Symposium on Macromolecules|
|Period||9/20/06 → 9/22/06|
All Science Journal Classification (ASJC) codes