排序方式: 共有13条查询结果,搜索用时 15 毫秒
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本文中用紫外光敏化的方法对低密度聚乙烯进行了交联,并利用ESCA和ATR-IR等手段研究了交联后材抖的光稳定性及其改进办法。 相似文献
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有机锡聚合物兼具杀菌防腐的生物活性功能和一般高分子材料的结构功能,有着潜在的应用前景[1]。本工作应用X射线萤光光谱测定甲基丙烯酸三丁基锡(TBTM)和甲基丙烯酸异戊酯(IPMA)共聚物中锡的含量。方便,迅速地获得了该共聚物的组成,计算了TBTM和IPMA在四氢呋喃中,55℃下共聚合的竞聚率,其结果分别为0.29和0.24。 相似文献
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以聚乙二醇(PEG)为配位体,首次合成了三价稀土金属镧与PEG的配位聚合物。实验测定了该配位聚合物的红外光谱、示差扫描量热谱(DSC)、热失重分析(TGA)和凝胶渗透色谱(GPC),并就配位反应、热分解以及配位前后分子流体力学体积的变化进行了讨论。 相似文献
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Different proportions of β-cydodextrin and epichlorohydrin were used to prepare a group of β-cyclodextrin polymers. The relationship between the reaction extent and the molar ratios of reactants was discussed according to the results of ~1H-NMR, ~(13) C-NMR spectra and elemental analysis. Especially, high resolution ~1H-NMR spectra were usd for studying the reaction active sites and the extent of reaction. The solubility of oil soluble drugs in water was largely improved in the presence of water-soluble β-cyclodextrin polymer. 相似文献
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用于X—射线防护的含钡含铅聚合物的合成与表征 总被引:2,自引:0,他引:2
本文首先制备了丙烯酸钡和丙烯酸铅。用红外、核磁及元素分析对它们进行了表征,然后将它们与苯乙烯及丙烯酸进行自由基共聚,得到含钡和/或含铅聚合物,研究了共聚物吸收X-射线的能力与金属含量的关系,发现吸收本领随金属盐含量的增加而增加。并且,含钡和铅两种金属的聚合物比只含相同量单种金属的聚合物能更好地吸收X-射线。和不含金属的聚合物相比,含金属的聚合物的力学强度有较大改善,还用红外、抽提等手段对聚合物进行了表征,对聚合物接受长期X-射线后的宏观变化进行了研究。 相似文献
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Crosslinked poly(methyl methacrylate) and polystyrene with barium dimethacrylate [Ba(MA)_2] as crosslinking agent have been synthesized. The relationship between X-ray absorbability and the content of Ba(MA)_2 in polymers was investigated. TGA and DSC results indicated that the crosslinked polymers containing barium dimethacrylate have a much better heat stability than pure PMMA or PS. The mechanical properties of the polymers containing barium are improved in comparison with the pure PMMA. 相似文献