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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis,Characterization,and Pervaporation Properties of Segmented Poly(urethane-urea)s
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Synthesis,Characterization,and Pervaporation Properties of Segmented Poly(urethane-urea)s

机译：嵌段聚（氨基甲酸酯-脲）的合成，表征和全蒸发性能

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Poly(urethane-urea)s (PUUs) from 2,4-tolylene diisocyanate (2,4-TDI),poly(oxytetramethylene)diols (PTMO) or poly(butylene adipate)diol (PBA),and various diamines were synthesized and characterized by Fourier transform infrared spectroscopy,gel permeation chromatography,differential scanning calorimetry,and density measurements.Transport properties of the dense PUU-based membranes were investigated in the pervaporation of benzene-cyclohexane mixtures.It was shown that the pervaporation characteristics of the prepared membranes depend on the structure and lenght of the PUU segments.The PBA-based PUUs exhibit good pervaporation performance along with a very good durability in separation of the azeotropic benzene-cyclohexane mixture.They are characterized by the flux value of 25.5 (kg #mu#m m~(-2) h~(-1) and the separation factor of 5.8 at 25 deg C,which is a reasonable compromise between the both transport parameters.The PTMO-based PUUs display high permeation flux and low selectivity in separation of the benzene-rich mixtures.At the feed composition of 5% benzene in cyclohexane,their selectivity adn flux are in the range of 3.2 to 11.7 and 0.4 to 40.3,respectively,depending on the length of the length of the hard and soft segments.The chemical constitution of the hard segments resulting from the chain extender used does not affect the selectivity of the PUU membranes.It enables,however,the permeability of the membranes to be tailored.
机译：由2,4-甲苯二异氰酸酯（2,4-TDI），聚（氧四亚甲基）二醇（PTMO）或聚己二酸丁二醇酯（PBA）和各种二胺合成的聚（氨基甲酸酯-脲）（PUU）通过傅里叶变换红外光谱，凝胶渗透色谱，差示扫描量热法和密度测量对其进行表征。研究了致密的PUU基膜在苯-环己烷混合物的全蒸发中的传输性能。结果表明，制备的膜的全蒸发特性取决于PUU段的结构和长度。基于PBA的PUU具有良好的全蒸发性能，并且在共沸苯-环己烷混合物的分离中具有非常好的耐久性，其通量值为25.5（kg＃mu＃ mm〜（-2）h〜（-1）和25°C下5.8的分离系数，这是两个传输参数之间的合理折衷。基于PTMO的PUU在高通量和高选择性下表现出较低的渗透率。分离富含苯的混合物。在5％苯在环己烷中的进料组成下，它们的选择性通量分别在3.2-11.7和0.4-40.3范围内，具体取决于硬质和软质的长度由使用的扩链剂产生的硬链段的化学组成不会影响PUU膜的选择性，但是可以调整膜的渗透性。

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