Effect of Domain Structure of Segmented Poly(urethane-imide) Membranes with Polycaprolactone Soft Blocks on Dehydration of n-Propanol via Pervaporation.
作者： Maria Sokolova , Alexander Bugrov , Michael Smirnov , Alexander Smirnov , Erkki Lahderanta
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摘要: Segmented poly(urethane-imide)s (PUIs) were synthesized by polyaddition reaction and applied for preparation of membranes. Tolylene-2,4-diisocyanate, pyromellitic dianhydride, m-phenylenediamine chain extension used to form hard aromatic blocks. Polycaprolactone diols with molecular weights equal 530 2000 g mol-1 chosen as soft segments. The effect the length segments on structure, morphology, transport properties segmented poly(urethane-imide) membranes studied using atomic force microscopy, small-angle wide-angle X-ray scattering, pervaporation experiments. It was found that a copolymer shorter segment (530 mol-1) consists domains in matrix, while introduction polycaprolactone blocks higher weight (2000 leads formation matrix. Additionally, prevents crystallization polycaprolactone. Transport based PUIs containing different tested model mixture propanol/water 20 wt % H₂O content. membrane longer demonstrates flux (8.8 kg μm m-2 h-1) selectivity (179) toward water comparison results pure reported literature. has lower (5.1 (437).
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