聚偏氟乙烯/导电TiO2复合压电薄膜的制备

为探究提高聚偏氟乙烯压电性能的方法,采用静电纺丝结合填料共混的方法制备了聚偏氟乙烯/导电TiO_2复合纳米纤维压电薄膜,并讨论了不同添加量的导电二氧化钛晶须对纤维薄膜直径、形貌、结晶形态和β相和γ相含量的影响。用扫描电子显微镜、傅里叶变换红外光谱和差示扫描量热仪测试方法表征纤维薄膜材料的微观形态结构和结晶结构。对复合纳米纤维薄膜的压电性能测试结果表明:静电纺丝是提高聚偏氟乙烯中β相含量的有效方法。导电TiO_2的添加除了诱导结晶取向,促进更多β相和γ相的形成,而且有助于将纺丝过程中形成的构相固定起来,从而达到提高产物压电性的目的。除此之外,添加导电TiO_2后,聚偏氟乙烯纤维膜的力学性能也有一定的提高。

Preparation of ploy( vinylidene fluoride)/conductive TiO2 composite fiber piezoelectric membrane

In order to improve the piezoelectric performance of poly ( vinylidene fluoride ) ( PVDF ) , PVDF/ATO/TiO2 composite piezoelectric membrane was prepared by electrostatic spinning combined with filler blending. Influences of the antimony tin oxide ( ATO )/TiO2 content on diameter, morphology, crystallization and contents of β phase and γ phase of the monofilament of the membrane. The scanning electron microscope, Fourier transform infrared spectrum and differential scanning calorimeter were used to characterize the microscopic morphological structure and crystallization structure of the fibrous membrane material. The piezoelectric performance testing results of the PVDF/ATO/TiO2 composite membrane show that electrostatic spinning is an effective method to improve the content ofβphase in the PVDF. Moreover, the addition of ATO/TiO2 not only induces the oriented crystallization to form more βphase and γ phase, but also stabilizes the conformation formed during electrostatic spinning, resulting in better piezoelectric performance. Besides, after the addition of ATO/TiO2 , the mechanical properties of PVDF fibrous membranes are improved to a certain extent.