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首页> 外文期刊>Journal of Applied Polymer Science >Temperature-sensitive membranes prepared by the plasma-induced graft polymerization of N-isopropylacrylamide into porous polyethylene membranes
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Temperature-sensitive membranes prepared by the plasma-induced graft polymerization of N-isopropylacrylamide into porous polyethylene membranes

机译：通过N-异丙基丙烯酰胺的等离子体诱导接枝聚合成多孔聚乙烯膜的温度敏感膜

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A temperature-responsive polymer, poly(N-isopropylacrylamide) (PNIPAAm), was grafted onto porous polyethylene membranes by a plasma-induced graft polymerization technique. A wide range of grafting was achieved through variations in the grafting conditions, including the postpolymerization temperature, time, monomer concentration, and graft-reaction medium. The active species induced by plasma treatment was proven to be long-living via a postpolymerization time of 95 h. Different solvent compositions, that is, water, methanol, benzene, and water/methanol, were used as reaction media, and water showed a much higher polymerization rate than the organic solvents. Based on the hydrophilicity of the active species, a mechanism explaining the solvent effect in plasma-induced graft polymerization was examined. Characterizations by scanning electron microscopy, X-ray photoelectron spectroscopy (XPS), and micro Fourier transform infrared showed that the grafted polymers were located on both the outer surface and inside pores of the membranes. The XPS analysis also confirmed that the polar amide groups tended to distribute more outward when grafted PNIPAAm was in its expanding state than when it was in its shrinking state. Water permeation experiments showed that the permeability of the grafted membranes varied dramatically with a slight temperature change in the vicinity of the lower critical solution temperature (LCST) of PNIPAAm. The effective pore radii of the grafted membranes above and below the LCST could be depicted by Hagen-Poiseuille's law. (C) 2003 Wiley Periodicals, Inc. [References: 22]
机译：通过等离子体诱导的接枝聚合技术将温度响应性聚合物聚（N-异丙基丙烯酰胺）（PNIPAAm）接枝到多孔聚乙烯膜上。通过改变接枝条件，包括后聚合温度，时间，单体浓度和接枝反应介质，可以实现广泛的接枝。经过95 h的后聚合时间，证明了通过等离子体处理诱导的活性物质是长寿命的。使用不同的溶剂组成，即水，甲醇，苯和水/甲醇作为反应介质，水的聚合速率比有机溶剂高得多。基于活性物质的亲水性，研究了解释在等离子体诱导的接枝聚合中的溶剂效应的机理。通过扫描电子显微镜，X射线光电子能谱（XPS）和微傅里叶变换红外光谱进行表征，表明接枝的聚合物位于膜的外表面和内部孔中。 XPS分析还证实，当接枝的PNIPAAm处于扩张状态时，极性酰胺基团倾向于比其处于收缩状态时更向外分布。水渗透实验表明，在PNIPAAm的较低临界溶液温度（LCST）附近，接枝膜的渗透性随温度的轻微变化而发生显着变化。 LCST上方和下方的接枝膜的有效孔半径可以用哈根-泊苏伊尔定律描述。 （C）2003 Wiley Periodicals，Inc. [参考：22]

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