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本文对不同聚合物在玻璃化转变温度区域附近损耗模量与温度标绘的积分关系(损耗面积LA)进行了表征。针对的聚合物包括不同的均聚物、无规共聚物及互穿聚合物网络(IPN),IPN是基于丙烯酸基、乙烯基和苯乙烯基链节的。发现其LA的大小是与分子特性有关的,决定于其各独立链节的结构。IPN及无规共聚物的LA均服从组成聚合物的加和关系,即等于各组分聚合物各自LA的加和。研究了基团对LA贡献分析的数据,每一结构成份均对LA值有特别的贡献。利用这个基团贡献分析所得的表,可对LA值进行估算。结果表明,主链的运动及连接到主链上的结构成份的运动对阻尼峰的贡献最大,长的支链起到了稀释剂的作用。
In this paper, the integral relationship between loss modulus and temperature plot (loss area LA) of different polymers near the glass transition temperature is characterized. The targeted polymers include different homopolymers, random copolymers and interpenetrating polymer networks (IPNs). IPNs are based on acrylic, vinyl and styryl linkages. The size of LA was found to be related to molecular properties, depending on the structure of its individual chain segments. The LA of the IPN and the random copolymer obeys the sum of the constituent polymers equal to the sum of the respective LA of the polymer of each component. Data on the contribution of groups to LA are studied, each of which has a special contribution to the LA value. Using this group contribution analysis of the resulting table, LA values can be estimated. The results show that the movement of the main chain and the movement of the structural elements attached to the main chain contribute the most to the damping peak and the long branches act as a diluent.