聚乙烯醇（PVA）的水溶液通过静电纺丝,可以生成直径均匀的纳米纤维,但纤维的水稳定性较差,用于液体过滤时一般需进行预处理。文中采用热处理的方法提高PVA纳米纤维的水稳定性。测试结果表明,热处理后的PVA纳米纤维结晶度有所增加;在150℃热处理10min后纤维的结晶度最大,增加了12%。处理后的纤维在水中不溶解,只发生凝集和膨胀。通过热压技术将PVA纳米纤维制成夹心净化材料,当纤维密度为5g/m2时,该夹心材料对粒径1μm的PS微球的过滤效率为95.50±1.83%。
Electrospinning of polyvinyl alcohol（PVA）can be performed from aqueous solution leading to the generation of homogenous nanofiber webs.PVA nanofibers are generally required to be modified due to its poor stability in water.The water stability of PVA nanofibers was improved by heat treatment in this paper.The test results show that the crystallinity of the PVA nanofibers increases after heat-treatment.The crystallinity which is the largest increases by 12% when they are treated at 150 ℃ for 10 min.The heat-treated fibers don＇t dissolve in water and show certain degree of agglutination and swelling.PVA nanofibers were taken as the inner layer of the sandwich structure purification material prepared with the hot pressing technology.The filtration efficiency of the resulted sandwich material is（95.50±1.83）% for PS microspheres of 1 μm in diameter when the surface density of PVA nanofibers is 5 g/m2.
参考文献
| [1] | Zeng J;Hou HQ;Wendorff JH;Greiner A .Photo-induced solid-state crosslinking of electrospun poly(vinyl alcohol) fibers[J].Macromolecular rapid communications: Publishing the newsletters of the European Polymer Federation,2005(19):1557-1562. |
| [2] | Gopal R;Kaur S;Ma ZW;Chan C;Ramakrishna S;Matsuura T .Electrospun nanofibrous filtration membrane[J].Journal of Membrane Science,2006(1/2):581-586. |
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