摘要
本文采用晶格模型,以动力学链段长度作为统计单元大小,推导了高聚物玻璃化温度T_8和链静态刚性因子σ~2(T_8),链动态刚性因子β(T_8)以及聚合度DP等分子参数之间的关系。具体讨论了链柔性对T_8的影响。理论预测和几十种聚合物的实验数据能较好吻合,分析结果表明T_8值基本上取决于高聚物链σ(T_8)大小。
The theoretical relationship, which correlates the glass transition temperature (Tg) with the other molecular parameters, has been proposed by taking the dynamic segment as the basic statistical unit. The dependency of Tg on the stiffness factor o2(Tg) for isolated chain at Tg and dynamic stiffness parameter (B= -d(lno2)/dT) has been discussed in detail. The theoretical prediction is compared with the experimental data for many linear polymers and the good agreement is obtained. It has been shown that T, is essentially governed by the chain stiffness factor at Tg.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1990年第4期434-440,共7页
Acta Polymerica Sinica
基金
中国科学院重大课题基金
国家自然科学基金
关键词
高聚物
玻璃化温度
链刚度因子
glass temperature, stiffness factor, dynamic stiffness parameter, heat capa-city, molecular weight
