以聚乙烯醇(PVA)为成膜载体,由聚四氟乙烯(PTFE)分散乳液制得PTFE微孔膜,通过对不同烧结温度的研究得出PTFE烧结模型,在烧结初期有利于PTFE形成微孔结构.在成膜体系中引入纳米无机粒子,得到PTFE/无机粒子共混平板膜.研究了无机粒子对共混膜结构及性能的影响,结果表明PTFE与碳酸钙(CaCO_3)粒子的粘结性差,在烧结成型过程中PTFE基质相与CaCO_3产生界面相分离形成微孔,形成的界面微孔不同于PTFE双向拉伸产生的纤维-结点状裂隙孔结构.共混膜经适当拉伸后孔隙率显著提高.
The poly(tetrafluoroethylene) (PTFE) micropore membranes were prepared by the concentrated PTFE suspension with poly(vinyl alcohol) (PVA) as membrane carrier. The sintering model was obtained by the different sintering tempreture, and the first stage of sintering is beneficial to form the pore structure. By introduction of inorganic particle into matrix, PTFE/inorganic particle blend membranes were obtained.The influence of the organic particle on the structure and properties of blend membranes were investigated. The results indicate that the interfacial adherence between PTFE and CaCO_3 is poor. The interfacial microvoids were created between the CaCO_3 and PTFE matrix in the sintering processing, which are much different from the fibril-node pore structure produced by biaxial stretching method.By properly stretched, the porosity of blend membrane improved obviously.
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