制备了端羟基聚丁二烯-聚氨酯（HTPB-PU）和端羟基聚丁二烯-乙烯基三乙氧基硅烷-聚氨酯（HTPB-VTES-PU）两种聚氨酯膜。采用傅立叶变换红外光谱（FT-IR）、差示扫描量热仪（DSC）和透射电镜（TEM）分析表征了两种膜的结构,结果发现,HTPB-PU有两个玻璃化转变温度,其膜具有一定程度的微相分离结构;HTPB-VTES-PU有三个玻璃化转变温度,相比于HTPB-PU膜,HTPB-VTES-PU膜的微相分离程度更高。两种膜对1%丁醇/水体系渗透汽化分离结果表明,随HTPB-PU膜内异氰酸酯基/羟基（-NCO/-OH）的增加,膜的分离因子增加,丁醇通量略有增加,而总通量下降;对于HTPB-VTES-PU膜,随VTES添加量的增大,膜的丁醇通量略有增加,水通量增加显著,而膜分离因子下降;与HTPB-PU膜相比,HTPB-VTES-PU膜的丁醇通量增加,但分离因子下降。
Hydroxyl-terminated polybutadiene-polyurethane（HTPB-PU） and HTPB-triethoxyvinylsilane-PU（HTPB-VTES-PU） membranes were prepared for pervaporation of n-butanol/water mixtures.The structure of HTPB-PU and HTPB-VTES-PU membranes were characterized by differential scanning calimetry（DSC）,transmission electron microscopy（TEM）.The results show that the HTPB-PU membrane possess the micro-phase separation structure,and the micro-phase separation structure of the HTPB-VTES-PU membrane is more significant with compared to HTPB-PU membrane.In 1% n-butanol aqueous solution pervaporation,the HTPB-PU membranes show that the separation factor increases continually with increase of the mole ratio of 4,4′-diphenylmethane diisocyanat（MDI）/HTPB（-NCO/-OH）,when the ratio of-NCO/-OH is 2,the separation factor and total flux of the HTPB-PU membrane are 42.8 g/m2·h and 38.1 g/m2·h at 60 ℃,respectively.The total flux of the membrane increases,and the separation factor increases slightly followed by a dramatic decrease with the increase of VTES content for the HTPB-VTES-PU membrane.
参考文献
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