中空纤维膜
复合数
膜
材料科学
纤维
复合材料
化学工程
化学
工程类
生物化学
作者
Masamoto Uenishi,Noriaki Fukushima,Masahiko Mizuta,Jun Kamo,Toshinori Tsuru
标识
DOI:10.1016/j.memsci.2014.04.042
摘要
Abstract Gas-permeable composite hollow-fiber membrane with a three-layered structure composed of a high-density polyethylene (HDPE) porous layer, a MK-2F thin dense layer, and a HDPE porous layer has been successfully developed by melt-spinning and cold/hot stretching. The MK-2F thin dense layer was composed of a poly(ethylenebutylene)-block–polystyrene triblock copolymer (SEBS) phase and a (poly(ethylene-co-ethylacrylate) (EEA)+poly(ethylene-co-propylene) (EPP)) phase. When the stretching ratio was increased, oxygen permeance, f O 2 , and nitrogen permeance, f N 2 , were linearly increased, while the f O 2 / f N 2 was almost constant at 2.95–3.0. The thickness of a no-pinhole thin layer was 2–5 μm and its f O 2 was 4.0–8.5×10 −6 cm 3 (25 °C) cm −2 s −1 cmHg −1 . Structural analysis of the thin layer indicated that the SEBS and the (EEA+EPP) formed a 3D-network structure, which restricted elastic recovery of the SEBS matrix and led to the thin thickness. In a pervaporation experiment, the H 2 O vapor permeation rate of the MK-2F thin layer was about 1/4 that of polydimethyl silicone (PDMS), and the IPA vapor permeation rate was about 1/12 that of PDMS even though the gas permeance of the MK-2F thin layer was almost the same as that of PDMS.
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