摘要
利用温度梯度固化的方法制备了厚度方向的梯度聚氨酯弹性体。FT-IR测试表明,沿高温到低温的方向,弹性体的微相分离程度呈梯度增加。溶胀动力学研究表明,聚氨酯弹性体的溶胀行为遵循二次动力学方程,微相分离程度较小的聚氨酯弹性体溶胀速率常数较大,但是最终的溶胀度却比较小,微相分离程度大的则相反。在相同的条件下,微相分离程度小的试样的溶解比微相分离程度大的需要更长的时间。
Graded polyurethane elastomers were prepared by curing in graded temperature field. According to FT-IR testing, microphase separation of samples prepared exhibits graded changing trend. The degree of microphase separation decreases with the increase of temperature. Swelling kinetics of polyurethane elastomers can be described by the second-order kinetics equation. Swelling rate constant increases with the decrease of the degree of microphase separation. However, the swelling degree exhibits the contrary changing trend. The dissolving time of elastomers increases with the decrease of the degree of microphase separation.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2008年第1期71-74,共4页
Polymer Materials Science & Engineering
基金
海军工程大学科研基金
海军工程大学理学院基金资助
关键词
聚氨酯
溶胀
微相分离
溶解
动力学
polyurethane
swelling
microphase separation
dissolve
kinetics
