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The polymerization of acrylamide (AAM)in H_2O/DMF or in H_2O/CH_3CN mixed solvent initiated with ceric ion (Ce~(4+) )/N-(substituted phenyl)-acetamide systems have been studied. The redox polymerization was revealed by the low value of overall activation energy (E_α) of AAM polymerization using ceric ion/N-(substituted phenyl) acetamide system as an initiator. The end group of polymer formed was detected by IR spectrum analysis method, it revealed the presence of N-(m-acetoxy-methylphenyl) acetamide (m-AAe) moiety end group in the polymer obtained with ceric ion/m-AAe initiation system. 相似文献
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似乎经济危机让裁员减薪成为企业应对危机的一种常态,但通过对已经公布2008年年报的上市公司的抽样分析却发现,情况可能并非如此。 相似文献
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聚酯/聚酸酐共混体系的降解和药物释放行为 总被引:1,自引:0,他引:1
聚酯/聚酸酐共混体系的降解和药物释放行为唐爱军,贺晓晖,李福绵(北京大学化学系北京100871)关键词聚癸二酸,聚乳酸,聚己内酯,降解行为,药物释放行为聚酸酐,特别是脂肪类聚酸酥由于其化学价键的水解活泼性,是一类快速生物降解材料.由于聚酸团的水解机制... 相似文献
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