(187c) Preparation and Characterization of Polyurethane Membranes and Pervaporation / Swelling Properties

Ye, H., Beijing Technology and Business University,
Wang, J., Beijing Technology and Business University
Feng, X., Beijing Technology and Business University

Two kinds of polyurethane (PU) membranes were prepared by a two-step method using Hydroxyl-terminated polybutadiene (HTPB) as soft segment and the 4, 4'-diaminodiphenyl methane (MDA) and b-cyclodextrins (b-CDs) as chain extenders, respectively. Firstly, HTPB reacted with 2, 4-toluene diisocyanate (TDI) with the molar ratio of 1/2, and then the NCO-terminated prepolyurethane was obtained. Secondly, MDA or MDA+b-CDs was added to the prepolyurethane, and the membranes of PU were prepared by solution casting. The structures and properties of PU thus obtained were characterized by means of FT-IR, DSC. And the swelling characteristics of the obtained membranes were studied in ethanol/water mixtures with various concentrations at 30°C. Furthermore, the pervaporation (PV) performances were investigated for separating ethanol/water aqueous solution with 90wt% ethanol content at different temperatures. The results showed that the swelling degrees of PU membrane with MDA+b-CDs were higher than that with MDA. The permeation fluxes of both membranes increased with the increased feed temperature from 40 to 70°C, while the separation factors of PU membrane with MDA decreased. But the separation factor of PU membrane with MDA+b-CDs decreased and then increased.


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