Morphological control of porous ethylene-vinyl acetate copolymer membrane obtained from a co-continuous ethylene-vinyl acetate copolymer/polycaprolactone blend
writer：Defeng Wu, Jie Zhang, Weidong Zhou, Zhen Yao, Ming Zhang, Dongpo Lin, Jianghong Wang
keywords：ethylene-vinyl acetate copolymers;
source：期刊
specific source：Polymer International
Issue time：2014年
Polym. Int., 2014, 63, 470-478
ABSTRACT:
Ethylene-vinyl acetate copolymers (EVA)/poly(caprolactone) (PCL) blend (50/50 w/w) with co-continuous morphology was prepared via melt mixing for fabricating microporous EVA membrane materials through selective solvent-extraction. The shear flow and quiescent annealing techniques were employed to control co-continuous phase size in the EVA/PCL blend, and the time- and temperature-dependent relations of phase size were then evaluated theoretically. Using those techniques, the microporous EVA membrane materials with various pore sizes ranged from 2 to more than 200 are obtained. In contrast to the porous EVA membrane prepared by the traditional way of solvent casting/particulate leaching, the as-obtained microporous membrane shows higher level of interconnectivity and much narrower pore size distribution with uniform pore structure.
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http://onlinelibrary.wiley.com/doi/10.1002/pi.4530/abstract