IDEAL COPOLYMERS AND THE 2ND-ORDER TRANSITIONS OF SYNTHETIC RUBBERS .1. NON-CRYSTALLINE COPOLYMERS
IDEAL COPOLYMERS AND THE 2ND-ORDER TRANSITIONS OF SYNTHETIC RUBBERS .1. NON-CRYSTALLINE COPOLYMERS
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DOI：
10.1002/jctb.5010020901
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发表时间：
1952-01-01
期刊：
影响因子：
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通讯作者：
TAYLOR, JS
中科院分区：
文献类型：
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作者：
GORDON, M;TAYLOR, JS
理论和实践证据表明，在解释堆积现象时，可以将共聚物视为小分子溶液，并且经常实现共聚物中重复单元的理想体积加和性。在此基础上，根据纯聚合物的两个二级转变温度及其玻璃态和橡胶态的膨胀系数，推导出了用于预测二元共聚物的二级转变温度θ的方程。因此，先前关于此类共聚物的二级转变温度的机械理论被将问题普遍简化为热膨胀机理所取代。概述了合成橡胶生产中单体选择的实际应用，并引起了人们对聚合物反应动力学测量中二阶转变的重要性的关注。
Theoretical and practical evidence is put forward to show that copolymers can be treated like solutions of small molecules in the interpretation of packing phenomena, and that ideal volume‐additivity of the repeating units in copolymers is frequently realized. On this basis equations are derived for predicting θ, the second‐order transition temperature, of binary copolymers from the two second‐order transition temperatures of the pure polymers and their coefficients of expansion in the glassy and rubbery states. Previous mechanistic theories of the second‐order transition temperature of such copolymers are thus superseded by a general reduction of the problem to the mechanism of thermal expansion. Practical applications to the choice of monomers in producing synthetic rubbers are outlined, and attention is drawn to the importance of second‐order transitions in kinetic measurements on the reactions of polymers.