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首页> 外文期刊>Journal of Applied Polymer Science >pH-Responsive Permeability of PE-g-PMAA Membranes
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pH-Responsive Permeability of PE-g-PMAA Membranes

机译：PE-g-PMAA膜的pH响应渗透性

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摘要

Poly(methacrylic aicd) (PMAA) grafted porous PE membranes. (PE-g-PMAA) were studied. It was found that (1) a wide range of graft yields can be achieved by varying irradiatin tiem (20-240 min) and monomer ocncentration (0.22M-0.66M), (2) the grafted membrane exhibits reversibel permeability response, (3) the membrane shows af maximum permeability response at an intermediate permeant molecualr weight due to size exclusion effect, and (4) depending on the graft yield, two types of permeability response can be obtained. These observations are consistent with our earlier study on poly(N-isopropylacrylamide) (PNIPAAM)-grafted porous polyethylene membranes. In addition, it was observed that the solvent used during grafting may influence the graft location-presumably due to variations in pore wetting. Specifically, compared to water solvent, methanol can increase grafting inside membrane pores, an observation inferred from membrane swelling, thickness measurement, and SEM characterization. Moreover, preferential grafting inside the membrane pores, as affected by increasing methanol contnet in the grafting solvent, results inlower membrane permeability and a greater pore graft-controlled type of permeability response.
机译：聚甲基丙烯酸（PMAA）接枝的多孔PE膜。 （PE-g-PMAA）进行了研究。发现（1）通过改变irradiatin tiem（20-240分钟）和单体浓度（0.22M-0.66M）可以实现大范围的接枝产率，（2）接枝膜表现出可逆的渗透性响应，（3 ）由于尺寸排阻效应，膜在中等渗透分子重量下显示出最大渗透率响应，（4）取决于接枝产率，可以获得两种类型的渗透率响应。这些观察结果与我们先前对聚（N-异丙基丙烯酰胺）（PNIPAAM）接枝的多孔聚乙烯膜的研究一致。另外，据观察，接枝过程中使用的溶剂可能影响接枝位置，大概是由于孔润湿性的变化。具体而言，与水溶剂相比，甲醇可以增加膜孔内部的接枝，这是从膜溶胀，厚度测量和SEM表征中得出的结论。此外，受接枝溶剂中甲醇含量的增加影响，膜孔内部的优先接枝会导致膜渗透率降低，并导致更大的孔接枝控制渗透率响应类型。

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