PVA电纺纤维后杂化反应膜的形态和保水性能

Morphology and moisture-retaining property of post hybridized membrane of electrospun PVA nanofibers

用电纺方法制备了直径为200nm左右的PVA纳米纤维毡,采用溶胶-凝胶法将其与原硅酸四乙酯(TEOS)溶胶杂化,通过控制反应时间制得不同的杂化薄膜。FTIR表明PVA的羟基与TEOS水解物发生了缩合反应。FESEM观察发现电纺纤维杂化后直径变粗,且随着反应时间的延长杂化纤维间的空隙逐渐被SiO2填充。力学性能测试发现,少量SiO2的填充有利于提高薄膜的强度。保水性能测试表明杂化反应时间越长所得薄膜的保水性能越高。

The PVA nanofibers with diameter about 200 nm were prepared by electrospinning,and the hybridized membrane was prepared with the PVA nanofibers and tetraethyl orthosiliconte（TEOS）by the sol-gel method.Different membranes were made by controlling the hybridization reaction time.FTIR showed that the hydroxyl goup in PVA condensed with the hydrolysate of TEOS.FESEM result indicated that the diameter of the hybrid fibers increased and the interspace of hybrid fibers were gradually filled in by SiO2 with increasing reaction time.Mechanical testing result indicated that the tensile strength of the hybrid membrane could be increased by filling in a little SiO2.The moisture-retaining property of the hybrid membrane became better with longer hybridization reaction time.