聚四氟乙烯室温非平衡heat capacity
Non-equilibrium heat capacity of polytetrafluoroethylene at room temperature
摘要：
对于具有室温热力学转变的复杂系统，可以将其作为量热研究的模型。该聚合物在292 K和303 K下表现出两种不同性质的相变。我们表明，灵敏的交流量热测量使我们能够研究聚四氟乙烯的热力学行为时，它是带出的热力学平衡。由于我们的量热装置的热模型化，该聚合物的频率依赖的复杂的热容量被提取。得到了聚四氟乙烯在292 K发生一级结构相变时复热容实部和虚部的温度和频率变化。
英文摘要：
Polytetrafluoroethylene can be considered as a model for calorimetric studies of complex systems with thermodynamics transitions at ambient temperature. This polymer exhibits two phase transitions of different nature at 292 K and 303 K. We show that sensitive ac-calorimetry measurements allow us to study the thermodynamic behaviour of polytetrafluoroethylene when it is brought out of thermodynamic equilibrium. Thanks to the thermal modelisation of our calorimetric device, the frequency dependent complex heat capacity of this polymer is extracted. The temperature and frequency variations of the real and imaginary parts of the complex heat capacity are obtained when polytetrafluoroethylene undergoes its first-order structural phase transition at 292 K.
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