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一种水溶性可聚合敏化剂N-甲基丙烯酰-N'-嘧啶哌嗪敏化的丙烯酰胺光聚合 总被引:1,自引:1,他引:1
The photopolymerization of acrylamide (AAm) was studied by using N-methacrylyl-N'-pyrimidinopip (MPMP) as sensitizer under UV irradiation.The photopolymerition rate of AAm in water with MPMP as sensitizer is proportional to 0.36th power of MPMP comcentration and 0.88th power of AAm concentration. The overall activation energy for the polymerization is determined to be 5.02Kcal/mol. A super-high MW (107) of PAAm are obtained. The MW is decreased with both the increasing of MPMP concentration and the raising of polymerizat-ion temperature,and inereased with the increase of AAm concentration. Fluoresce-nt analysis indicates that MPMP not only initiates the photopolymerization of vinyl monomers,but also enters into the polymer chains. 相似文献
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8-丙烯酰氧喹啉及其聚合物与四溴化碳双组分体系敏化的丙烯腈光聚合 总被引:1,自引:0,他引:1
Photopolymerization of acrylonitrile (AN) sensitized by binary component initiators consisting of 8-acryloyloxyquinoline (AQ) and its polymer (PAQ) with carbon tetrabromide (CTB) are investigated kinetically. It is found that the polymerization rates are proportional to 0.19th power of AQ concentration, 0.35th power of CTB concentration and 0.62th power of AN concentration for AQ-CTB system initiation system; proportional to 0.24th power of PAQ concentration, 0.22th power of CTB concentration and 1.0th power of AN concentration initia-ted by above systems are obtained to be 5.26Kcal/mol and 6.34Kcal/mol respectively. It is also found that the polymerization rates sensitized by addition of CTB to AQ or PAQ are much higher than that ofAQ or PAQ alone. Forom the fluorescence analysis of AN polymers,it is confirmed that AQ or PAQ joints into the AN polymer chains. The molecular weight of PAN sensitized by the binary initiatorsystems is lower than that of AQ or PAQ sensitized. 相似文献
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The photopolymerization of acrylonitrile sensitized by N-methyl-N-(2-methacryloyloxye-thyl)aniline (MEMA) was studied kinetically. The photopolymerization rate of AN in DMF by using MEMA as sensitizer is proportional to 0.32 th power of MEMA concentration and 1.20 th power of AN concentration. The overall activation energy for the polymerization was found to be 4.82 Kcal/Mol. From the fluorescence analysis of obtained polyacrylonitrile sensitized by MEMA, it was confirmed that MEMA not only joined the inition but also entered into the polyacrylonitrile chains. The initiation mechanism was proposed tentatively. 相似文献
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