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首页> 外文期刊>Journal of Applied Polymer Science >Application of DMAEMA-Grafted Expanded PTFE Films to Positively Charged ultrafiltration Membranes and Their Electrostatic Sieve Separation Properties
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Application of DMAEMA-Grafted Expanded PTFE Films to Positively Charged ultrafiltration Membranes and Their Electrostatic Sieve Separation Properties

机译：DMAEMA接枝膨胀PTFE膜在带正电超滤膜中的应用及其静电筛分离性能

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摘要

A study was done of the ultrafiltration properties of expanded polytetrafluoroethylene (ePTFE) films with two average pore sizes, 0.5 and 3.0JLm, grafted with 2-(dimethylamino)ethyl methacrylate (DMAEMA~grafted 0.5-ePTFE and grafted 3.0-ePTFE-using dextran (Dxt)and quaternized dextran (qDxt) in water and in buffer solutions with a pH in the range of 4-10. The water permeability was found to be proportional to the operating pressure below 2.0 kgf/cm2. Grafted 0.5-ePTFE films apparently had a higher rejection than did the grafted 3.0-ePTfE films,a'ld the cutoff value for grafted 0.5-ePTFE films decreased with an increase in the grafted amount. The apparent rejection ofDxt and qDxt increased with a decrease in the pHvaJue, and the apparent rejection of qDxt was higher than that of Dxt when the pH was in the range of 4-8 because of an electrostatically repulsive interaction between positively charged grafted PDMAEMA chains andqDxt molecules. For grafted O.5-ePTFE films, 40KDxt was selectively separated from the 40KDxt1250KDxt mixture systems in water and from the 40KDxt/40KqDxt mixture systems atpH 6 using the difference in their apparent rejection; the separation factors in both systems increased with the grafted amount. These results indicate that grafted ePTFE films are applicable to positively charged ultrafiltration membranes.
机译：研究了两种平均孔径分别为0.5和3.0JLm的发泡聚四氟乙烯（ePTFE）膜的超滤性能，该膜接枝了甲基丙烯酸2-（二甲氨基）乙酯（DMAEMA接枝了0.5-ePTFE和使用葡聚糖接枝了3.0-ePTFE） （Dxt）和季铵化的右旋糖酐（qDxt）在水和pH范围为4-10的缓冲溶液中发现，水渗透性与工作压力低于2.0 kgf / cm2成比例。显然接枝了0.5-ePTFE薄膜具有比接枝的3.0-ePTfE膜更高的截留率，并且接枝的0.5-ePTFE膜的截留值随接枝量的增加而减小; Dxt和qDxt的表观截留率随pHvaJue的减小而增加，并且当pH在4-8范围内时，由于带正电的接枝PDMAEMA链与qDxt分子之间的静电排斥作用，qDxt的表观截留率高于Dxt。对于接枝的O.5-ePTFE膜，选择40KDxt利用表观截留率的差异从水中的40KDxt1250KDxt混合系统和40KDxt / 40KqDxt混合系统中分离出来;两个系统中的分离因子均随接枝量的增加而增加。这些结果表明，接枝的ePTFE膜适用于带正电的超滤膜。

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