天津工业大学学报2016，Vol.35Issue(3)：10-15,6.DOI:10.3969/j.issn.1671-024x.2016.03.003
凝固浴组成对PVDF高度疏水微孔膜结构和性能的影响
Effect of coagulation bath composition on morphology and property of microporous PVDF high hydrophobic membrane
摘要
Abstract
The method of immersion precipitation processes was proposed for preparing high hydrophobic poly (vinylidene fluoride) (PVDF) microporous membranes. The blank plate was used as the substrates, while N-methyl pyrroli-done(NMP) and aqueous solutions of different NMP concentrations were respectively chosen as solvent and non-solvent in the process. Then, in order to study the effects of the coagulation bath compositions on the the way of phase separation and morphology of membrane, the membranous structure, hydrophobic degree of the bottom surface and other properties of the membrane were characterized. Generally the liquid-liquid demixing process contributed to the asymmetric spongy structures while the solid-liquid demixing process caused the uniform par-ticulate morphology. The study found increasing of NMP of coagulation bath changed the way of phase separation:the pure liquid-liquid demixing process changed to the solid-liquid demixing process had advantaged to liquid-liquid demixing process gradually. Accordingly, the asymmetric spongy structures transformed to particulate mor-phology. It was because when adding NMP to the coagulation bath, the chemical grads between the cast solution and coagulation bath is decreased, so the gelation rate decreases and instantaneous type phase separation changes to delayed type phase separation. Consequently, the results were:with increasing of NMP of coagulation bath, it led to the contact angle of the membrane with water was as high as 131°, indicating high hydrophobic property. In addition, the membrane permeability was improved while the mechanical tensile properties reduced slightly.关键词
聚偏氟乙烯/微孔膜/疏水性/凝固浴Key words
PVDF/microporous membrane/hydrophobic/coagulation bath分类
轻工纺织引用本文复制引用
杨振生,李金瑞,任艳娜,王志英..凝固浴组成对PVDF高度疏水微孔膜结构和性能的影响[J].天津工业大学学报,2016,35(3):10-15,6.基金项目
河北省高等学校科学技术研究重点项目 （）
