| EVA预辐射接枝N－异丙基丙烯酰胺制备热敏性材料 |
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| 引用本文： | 丁中立,浦鸿汀,叶宏,马瑞德.EVA预辐射接枝N－异丙基丙烯酰胺制备热敏性材料[J].辐射研究与辐射工艺学报,1994(1). |
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| 作者姓名： | 丁中立 浦鸿汀 叶宏 马瑞德 |
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| 作者单位： | 上海科技大学射线应用研究所，华盛顿大学 |
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| 摘 要： | 采用预辐射接枝法，将Ｎ－异丙基丙烯酰胺（ＮＩＰＡＡｍ）接枝到乙烯－醋酸乙烯酯共聚物（ＥＶＡ）试片上。研究了各种因素对接枝反应的影响。结果表明，接枝体系具有一般预辐照液－固两相接枝体系的共性，如在接枝反应前期，反应速度不变，以后逐渐下降，接枝率与反应温度成正比，少量的Ｃｕ（ＮＯ３）２，就能使接枝率急剧下降。经ＮＩＰＡＡｍ接枝的ＥＶＡ表面，呈现与ＮＩＰＡＡｍ凝胶相似的热敏性，即在低于“较低临界溶解温度”（ＬＣＳＴ）的温度时溶胀于水，而在高于ＬＣＳＴ时，迅速退溶胀，其ＬＣＳＴ约为３２℃，水含量随温度的变化是可逆的。相比之下，接枝ＮＩＰＡＡｍ的ＥＶＡ表面比ＮＩＰＡＡｍ凝胶具有更灵敏的热敏性。试片的ＬＣＳＴ会随着接枝层的组成变化而漂移。
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| 关 键 词： | N－异丙基丙烯酰胺，热敏性，水凝胶，辐射，辐射接枝 |
A THERMO-SENSITIVE MATERIAL PREPARED BY PREIRRADIATION GRATING OF NIPAAm ONTO EVA POLYMER |
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| Ding Zhongli, Pu Hongting, Ye Hong, Ma Zueteh.A THERMO-SENSITIVE MATERIAL PREPARED BY PREIRRADIATION GRATING OF NIPAAm ONTO EVA POLYMER[J].Journal of Radiation Research and Radiation Processing,1994(1). |
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| Authors: | Ding Zhongli Pu Hongting Ye Hong Ma Zueteh |
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| Abstract: | N--isopropylacrylamide (NIPAAm)was grafted onto ethyl-vinyl acetate(EVA) copolymer by means of preirradiation grafting. The factors which affect thegrafting reaction were studied. The common characteristics of the preirradiation grafting reaction in liquid monomer--solid trunk polymer system are observed in thissystem. The surface of EVA grafted with NIPAAm shows thermo--sensitivity similarto a poly--NIPAAm gel. The response to the change of temperature through the lowercritical solution temperature (LCST) of the graft is more swift than that of the gel.The LCST of the grafted surface shifts to higher and the drop of .swelling aroundthe LCST diminishes with increasing hydrophilicity of the graft when co-graftingNIPAAm with acrylic acid (AA) or acrylamide (AAm). |
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| Keywords: | N-isopropylacrylamide Thermo-sensitive Hydrogel Radiation Radiation grafting |
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