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首页> 外文期刊>Journal of Applied Polymer Science >RADIATION-INITIATED GRAFT COPOLYMERIZATION OF 4-VINYLPYRIDINE ONTO POLYETHYLENE AND POLYTETRAFLUOROETHYLENE FILMS AND ANION-EXCHANGE MEMBRANES THEREFROM
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RADIATION-INITIATED GRAFT COPOLYMERIZATION OF 4-VINYLPYRIDINE ONTO POLYETHYLENE AND POLYTETRAFLUOROETHYLENE FILMS AND ANION-EXCHANGE MEMBRANES THEREFROM

机译：4-乙烯基吡啶的辐射引发接枝共聚在聚乙烯和聚四氟乙烯薄膜上以及由此得到的阴离子交换膜

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Radiation-initiated graft copolymerization of 4-vinylpyridine (4VP) onto low-density polyethylene (LDPE) and polytetrafluoroethylene (PTFE) films was carried out by gamma-rays from Co-60 source in nitrogen atmosphere. The direct method of multiple grafting was used, connected with posteffect taking place at irradiation doses from 1 to 35 kGy. Thus the monomer diffused into the polymer matrix together with the stepwise generation of free radicals to reduce the thickness of the nongrafted layer. The grafting proceeds in the amorphous phase of the polymers which is further amorphized by the irradiation. Copolymers with grafting degree (P) from 17 to 75% for LDPE and from 0.7 to 13% for PTFE were obtained. The dependence of the degree of grafting of 4VP on irradiation dose was established. The spectral and thermodynamic properties of the synthesized copolymers were studied. The degree of crystallinity was found to decrease and a two-stage mechanism of thermooxidative destruction was observed. The synthesized copolymers contain pyridine groups determining their anion-exchange properties. The initial pyridine groups in the grafted copolymers were quaternized. Some of the basic characteristics, such as water content and specific electric resistance of anion-exchange membranes (AEM) were studied depending on the grafting degree of 4VP. The ionomers studied possess high transport number ((t) over bar(-) similar to 0.8-0.9), good diffusion characteristics (9.2 X 10(-8)-1.7 x 10(-7) cm(2)/s), and suitable tensile properties. The AEM obtained, combined with the cation exchange membranes we have synthesized earlier on the same polymeric basis, can be used successfully in various electrodialysis processes. (C) 1997 John Wiley & Sons, Inc. [References: 22]
机译：在氮气氛中，通过来自Co-60源的伽马射线将4-乙烯基吡啶（4VP）辐射引发的低聚聚乙烯（LDPE）和聚四氟乙烯（PTFE）薄膜上的接枝共聚反应。使用直接嫁接的方法，并在1至35 kGy的辐射剂量下进行后效应。因此，单体与逐步生成自由基一起扩散到聚合物基质中，以减小非接枝层的厚度。接枝在聚合物的无定形相中进行，该无定形相通过辐射进一步非晶化。得到的共聚物的接枝度（P）对于LDPE为17％至75％，对于PTFE为0.7％至13％。建立了4VP的接枝度对辐照剂量的依赖性。研究了合成共聚物的光谱和热力学性质。发现结晶度降低并且观察到热氧化破坏的两阶段机理。合成的共聚物含有确定其阴离子交换性能的吡啶基。接枝共聚物中的起始吡啶基被季铵化。根据4VP的接枝度，研究了阴离子交换膜（AEM）的含水量和比电阻等一些基本特性。所研究的离聚物具有较高的传输数（bar（-）上的（t）类似于0.8-0.9），良好的扩散特性（9.2 X 10（-8）-1.7 x 10（-7）cm（2）/ s），和合适的拉伸性能。获得的AEM与我们先前在相同的聚合物基础上合成的阳离子交换膜相结合，可成功用于各种电渗析工艺中。 （C）1997 John Wiley＆Sons，Inc. [参考：22]

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