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首页> 外文期刊>Journal of Applied Polymer Science >Preparation of ion-exchange membranes by hydrolysis of radiation-grafted polyethylene-g-polyacrylamide membranes
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Preparation of ion-exchange membranes by hydrolysis of radiation-grafted polyethylene-g-polyacrylamide membranes

机译：辐射接枝聚乙烯-g-聚丙烯酰胺膜的水解制备离子交换膜

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摘要

Polyethylene-g-polyacrylamide membranes were prepared by graft polymerization of acrylamide onto polyethylene films using a preirradiation method. The ion-exchange membranes were obtained by the hydrolysis of grafted films so as to transform amide groups into carboxyl groups. The fraction of amide groups transformed into carboxyl groups was limited to similar to0.5. The characterization and thermal behavior of membranes with different degrees of grafting were evaluated by FTIR, thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC) measurements. The heat of fusion and the crystallinity of polyethylene decreased considerably in the hydrolyzed membranes depending on the degree of grafting. It was found that the grafting of acrylamide led to the reduction in crystallinity due to disruption of the crystallites (crystal defects) and dilution of the inherent crystallinity (dilution effect). The contribution of the hydrolysis step to the crystallinity decrease was negligible. The thermal stability of the membranes as obtained from TGA showed considerable enhancement after hydrolysis. (C) 2003 Wiley Periodicals, Inc. [References: 34]
机译：聚乙烯-g-聚丙烯酰胺膜是通过使用预辐射方法将丙烯酰胺接枝聚合到聚乙烯薄膜上而制得的。通过将接枝膜水解以将酰胺基转化为羧基来获得离子交换膜。转化成羧基的酰胺基团的分数被限制为类似于0.5。通过FTIR，热重分析（TGA）和差示扫描量热法（DSC）测量来评估具有不同接枝度的膜的特性和热行为。取决于接枝程度，水解膜中的熔融热和聚乙烯的结晶度大大降低。发现丙烯酰胺的接枝由于微晶的破坏（晶体缺陷）和固有结晶度的稀释（稀释作用）而导致结晶度的降低。水解步骤对结晶度降低的贡献可忽略不计。由TGA获得的膜的热稳定性在水解后显示出显着的增强。 （C）2003 Wiley Periodicals，Inc. [参考：34]

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