溶液法制备PVDF薄膜电活性相方法

为了制备具有电活性相的聚偏氟乙烯(PVDF)薄膜,采用了简单易操作的溶液涂膜方法,并研究了不同前驱体溶液浓度、搅拌时间以及热压工艺对PVDF不同电活性相的晶型结构形成的影响,利用X射线衍射仪、傅里叶变换红外光谱仪(FTIR)对PVDF薄膜的晶型结构进行分析.结果表明:前驱体溶液浓度7%~10%,搅拌时间2~3 h都有利于β相的形成,利用红外光谱,可以计算β相的含量,在前驱体溶液浓度7%,搅拌时间2 h时得到最大的β相含量81.3%;热压对PVDF薄膜的晶型结构有很大的影响,经过热压处理的PVDF薄膜中γ相转变成更加致密的β相.

Preparation methods of PVDF film with electroactive phase by solution method

Poly (vinylidene fluoride) (PVDF) films with electroactive phases were prepared by simple feasible solution crystallization method. The influences of various precursor solution concentrations, different stirring times and hot pressing process on the formation of electroactive crystal phase structures in PVDF were studied. The X-ray diffraction(XRD)and Fourier transform infrared spectroscopy (FTIR) were used to determine the crystal structure and analyze the formation mechanism of the electroactive phases in PVDF. The results indicate that the different precursor solution concentrations and different processing times have a great influence on the formation of electroactive phases in PVDF. It is easier to form β phase when the solution concentrations range from 7% to 10% and processing times between 2 hours and 3 hours. By using FTIR techniques, a maximum content of 81.3% for β phase is calculated in the situation that solution concentration is 7% and processing time is 2 hours. Hot pressing process plays an important role in the change of crystal structure, and this γ phase in PVDF films will transform into more dense β phase after hot-press process.