摘要
通过动态力学分析研究了不同交联程度的聚氨酯弹性体的高弹模量对温度的依赖性。详细分析了弹性体内部的物理交联密度随温度的变化,认为物理交联密度的下降主要是氢键的解离造成的。计算得到了试样的氢键活化能和物理交联对弹性模量的贡献,同时研究了它们随温度的变化情况。交联程度小的,氢键活化能高,氢键随温度升高的解离速率快,交联程度大的则相反。
Both chemical and physical crosslinking density in polyurethane elastomers can affect the moduli. There are a lot of hydrogen bondings, leading to physical crosslinking, in polyurethane elastomer. Hydrogen bondings can dissociate with the increase of the temperature. As a result, physical crosslinking density will decrease. And modulus of elastomer will be affected consequently. Detailed investigation about this was carried out. Activation energy of hydrogen bonding association and contribution to modulus of physical crosslinking were studied quantitatively.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2008年第4期89-92,共4页
Polymer Materials Science & Engineering
基金
海军工程大学科研基金(E387)资助
海军工程大学理学院基金
关键词
物理交联
氢键
聚氨酯
温度依赖性
高弹模量
physical crosslinking
hydrogen bonding
polyurethane
temperature dependence
plateau modulus
