SiO2原位掺杂聚偏氟乙烯纳米纤维膜的制备及其性能

为提高聚偏氟乙烯(PVDF)的压电性能,以PVDF和正硅酸乙酯(TEOS)为原料,N,N-二甲基甲酰胺(DMF)和丙酮为混合溶剂,利用原位复合溶胶-凝胶法和高压静电纺丝技术制备纳米SiO₂原位掺杂PVDF复合纳米纤维膜,并分析纳米纤维膜的表面微观形貌、化学结构、力学性能以及压电性能等。结果表明:复合纳米纤维膜的面密度与厚度随TEOS质量的增加而增加;静电纺丝使PVDF中部分α相转变为β相,纯PVDF纳米纤维膜的β相含量是PVDF粉末的1.54倍,为(31.42±0.62)%;且原位掺杂SiO₂后β相含量进一步提高,拉伸强力与输出电压均呈先增大后降低的趋势,当TEOS质量为1.643 g时PVDF纳米纤维膜β相含量最高为(42.59±0.62)%,原位掺杂PVDF纳米纤维膜拉伸强力最大为(8.03±0.19) N,输出电压最高为(2.33±0.13) V。

Preparation of SiO2in-situ doped polyvinylidene fluoride nanofiber membrane and its properties

To improve the piezoelectric properties of polyvinylidene fluoride(PVDF),silicon dioxide(SiO₂)in-situ doped PVDF composite nano fiber membranes were prepared via the sol-gel method and high-voltage electrospinning technology with PVDF and ethylsilicate(TEOS)as raw materials,N,N-dimethyl formamide(DMF)and acetone as mixed solvent.Surface micromorphology,chemical composition,mechanical and piezoelectric properties of the nanofiber membranes were compared and analyzed.Results show that the mass and thickness of composite nanofiber membranes ascended with the increase of TEOS.Electrospinning converted part of theαphase in PVDF toβphase,and theβphase content of pure PVDF nanofiber membrane was(31.42±0.62)%,which was 1.54 times higher than PVDF powder.Moreover,the content ofβphase was further improved by in-situ doping of nano-SiO₂,and peak value of(42.59±0.62)%was achieved when the mass of TEOS was 1.643 g.With the increase of nano-SiO₂,both tensile force and output voltage of composite nanofiber membranes demonstrated an increase-decrease trend.In addition,when the mass of TEOS was 1.643 g,SiO₂in-situ doped PVDF nanofiber membrane exhibited the highest tensile strength and output voltage,which were(8.03±0.19)N,and(2.33±0.13)V,respectively.