后处理对电纺氧化钛复合纤维表面形貌的影响

以聚乙烯吡咯烷酮的乙醇溶液与钛酸正丁酯为前驱体溶液,采用静电纺丝法制备氧化钛复合纤维,经空气中水解聚合、浸水和煅烧等后处理分别得到表面粗糙的氧化钛复合纤维和氧化钛无机纤维;采用扫描电子显微镜(SEM)、红外光谱仪(FTIR)、热重分析仪(TG)对所制得纤维的表面形貌、结构和组成进行表征.结果表明:初纺的氧化钛复合纤维经过与空气中水分进行水解聚合后,纤维内部形成了不溶于水的骨架结构,使其浸水后仍能保持纤维形貌;同时复合纤维中水溶性成分的去除,使纤维表面形成粗糙结构,这种纤维的表面粗糙结构可通过不同温度煅烧进行调节,同时煅烧后得到氧化钛无机纤维.

Influence of posttreatment on surface structure of electrospun titania composite fibers

The composite nanofibers are prepared by electrospinning using tetrabutyl titanate and polyvinglpyrrolidone(PVP)-ethanol solution as starting materials.The composite nanofibers are posttreated by hydrolysis and condensation in air,immergence in water,calcination with different temperatures,and the nanofibers with rough surface can be prepared.The surface morphlogy,structure,composition of the nanofibers are characterized by scanning electron microscopy(SEM),Fourier transform infrared(FTIR) spectra and thermogravimetric(TG) analysis.The results indicate that insolubility framework forms in as-spun composite nanofibers after exposure in air by etrabutyl titanate hydrolysis and condensation.The framework in nanofibers make it keep fiber′s morphlogy after being immerged in water.Meanwhile,the solubility components in nanofibers are removed in water leading to form nanofibers with rough surface.The rough surface of nanofibers can be adjusted by calcination in different temperatures and inorganic titania nanofibers form by calcination process.