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通过静电纺丝技术制备了聚乙烯醇(PVA)纳米纤维膜,研究了热压处理的条件(温度、压力、时间)对提升PVA纤维膜水稳定性的影响。随着热压温度的增加,PVA纤维膜的水稳定性增强,红外测试显示,不同温度(50℃、100℃、155℃)热压处理,水稳定性增强的机理不同。扫描电镜照片及水稳定性测试表明,与单纯加热处理相比,热压处理可在较低温度下达到较高温度的效果,压力起到了协同作用。热压压力大于4MPa后,纤维膜的水稳定性无明显提升,热压时间对不同温度处理的PVA纤维膜的水稳定性影响有明显差异。综合考虑PVA的性能和水稳定性,最佳热压处理条件为100℃,4MPa,2min。
Polyvinyl alcohol (PVA) nanofibers were prepared by electrospinning. The effects of hot pressing conditions (temperature, pressure and time) on the water stability of PVA fiber membranes were studied. With the increase of hot pressing temperature, the water stability of PVA fiber membrane is enhanced. Infrared tests show that the mechanism of water stability enhancement is different with different temperature (50 ℃, 100 ℃, 155 ℃). Scanning electron micrographs and water stability tests show that, compared with the simple heat treatment, hot pressing treatment can achieve the effect of higher temperature at a lower temperature, and the pressure has a synergistic effect. Hot press pressure is greater than 4MPa, the water stability of the fiber membrane did not improve significantly, hot pressing time of different temperature treatment of PVA fiber membrane water stability have significant differences. Taking into account the performance of PVA and water stability, the best hot pressing conditions are 100 ℃, 4MPa, 2min.