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Calorimetric and X-Ray Studies of the Solid State Transition in Copolymers of Vinylidene Fluoride and Trifluoroethylene

机译:偏二氟乙烯和三氟乙烯共聚物中固态转变的量热和X射线研究

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Copolymers of vinylidine fluoride and trifluoroethylene are presently being considered for many piezoelectric applications. In contrast to the poly(vinylidene fluoride) homopolymer, a transition from the room temperature ferroelectric phase has been observed in these copolymers. The temperature of this transition was determined by measuring the position of the endothermic peak observed in the Differential Scanning Calorimeter. The rate of cooling from the paraelectric to ferroelectric phase was found to affect the temperature at which the transition occurred on subsequent heating. Changing the conditions under which molten polymer initially crystallized into the paraelectric phase had an even greater effect on the resultant transition temperature. In addition to the thermal studies, wide angle X-ray measurements were performed to determine the effect of different thermal treatments on the structure of the resultant ferroelectric phase crystallites.

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