Twist Phase Transition in Poly(p-phenylene) Oligomers: Heat Capacity of p-Quinquephenyl

Kazuya Saito; Yasuhisa Yamamura; Michio Sorai

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Twist Phase Transition in Poly(p-phenylene) Oligomers: Heat Capacity of p-Quinquephenyl

机译：聚（对亚苯基）低聚物中的扭曲相变：对喹啉苯基的热容

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The heat capacity of crystalline p-quinquephenyl was measured by adiabatic calorimetry below room temperature. A broad hump was detected around 264 K and attributed to a phase transition, through which an average molecular conformation changes from the planar to the twisted one on cooling. A similar anomaly was also detected for crystalline p-sexiphenyl arund 295 K by chopped-light ac calorimetry. The broad shape of the thermal anomalies arising from the twist transitions are discussed in relation to the number of possible intramolecular twisting modes. Properties of the twist transition n polymer are discussed on the basis of those of oligomers. Standard thermodynamic functions are tabulated for p-quinquephenyl.

机译：在室温以下通过绝热量热法测量结晶的对喹啉苯基的热容。在264 K附近检测到一个宽峰，归因于相变，冷却时平均分子构象从平面变为扭曲。通过斩光交流量热法也检测到了结晶对-对苯二酚芳烃295 K的类似异常。关于可能的分子内扭曲模式的数量，讨论了由扭曲转变引起的热异常的宽泛形状。在低聚物的基础上讨论了扭曲转变n聚合物的性能。对-五喹苯基的标准热力学函数列于表中。

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《Bulletin of the Chemical Society of Japan》 |2000年第12期|共6页
作者
Kazuya Saito; Yasuhisa Yamamura; Michio Sorai;
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正文语种 eng
中图分类化学;化学工业;
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Twist Phase Transition in Poly(p-phenylene) Oligomers: Heat Capacity of p-Quinquephenyl

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