PVA-co-PE纳米纤维过滤膜的制备及性能表征

Preparation and Performance Characterization of PVA-co-PE Nanofiber Membrane

通过熔融挤出相分离法制备聚乙烯醇-乙烯共聚物(PVA-co-PE)纳米纤维,然后将纳米纤维涂覆到聚丙烯(PP)熔喷非织造布表面制备纳米纤维复合膜.表征了纳米纤维复合膜的表面形貌,分析了其孔径分布、接触角和力学性能随涂覆率的变化,并通过测量纳米纤维复合膜对CaCO3悬浮液的过滤效果,研究了其过滤性能和截留率.研究结果表明:表面涂覆PVA-co-PE纳米纤维后,PP熔喷非织造布的力学性能、亲水性能都有显著的提高;随着纳米纤维量的增加,膜的孔径分布更加均匀,平均孔径减小;涂覆150g纳米纤维悬浮液后,复合膜对CaCO3悬浮液的过滤效率最高可达到75.86%.

The poly(vinyl alcohol-co-ethylene)(PVA-co-PE)nanofibers were prepared by a melting extrusion and phase separation process.The composite nanofiber membrane was prepared subsequently by coating the PVA-co-PE nanofibers onto the polypropylene(PP) melt-blown substrate.The morphology of the composite nanofiber was characterized,and the effect of coating rates on its pore size distribution,contact angle,mechanical properties were investigated,also,the filtration properties and rejection rate were studied by testing the filtration effect of PVA-co-PE nanofiber membrane to CaCO3suspension.The research result showed that the mechanical properties and hydrophilicity of PP melt blown substrate was enhanced after the coating of PVA-co-PE nanofibers.The pore size distribution of nanofiber membrane was more uniform and the average of pore size descended with the increase of nanofibers.The rejection rate of PVA-co-PE nanofiber membrane coated with 150 g nanofiber to nanosized CaCO3suspension was 75.86%.