共查询到20条相似文献,搜索用时 437 毫秒
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N—[1-(2-吡咯烷酮基)甲基]丙烯酰胺类的聚合及其水凝胶于淑艳,李福绵(北京大学化学系,北京,100871)关键词N-[1-(2-吡咯烷酮基)甲基]丙烯酸胺、氧化-还原引发体系、超高分子量、平衡吸水率N一【l一(2一毗咯烷酮基)甲基]丙烯酸胺(P... 相似文献
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铕(Ⅲ)-β-二酮-4,4'-联吡啶-N,N'-二氧化物三元配合物的合成与表征林惠文,朱文祥(海南师范学院化学系,海口,571158)(北京师范大学化学系,北京,100875)关键词铕(Ⅲ),4,4'-联吡啶-N,N'-二氧化物,β-二酮,三元配合物... 相似文献
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聚N-烷基丙烯酰胺类凝胶及其温敏特性 总被引:11,自引:0,他引:11
研制成功5种聚N-烷基丙烯酰胺类温敏凝胶:聚N-异丙基丙烯酰胺(PNIPA),聚N-异丙基丙烯酰胺+甲基丙烯酰胺(PNIPA/MAA),聚N,N-二乙基丙烯酰胺(PNDEA),聚N-正丙基丙烯酰胺(PNNPA),聚N,N-二乙基丙烯酰胺+N-叔丁基丙烯酰胺(PNDEA/NTBA),并系统研究了这些凝胶的温敏相交特性.以聚N-异丙基丙烯酰胺(PNIPA)凝胶相交特性为基础的凝胶萃取过程对牛血清白蛋白和兰葡聚糖溶液的浓缩实验表明,凝胶萃取对于浓缩和制备贵重生化制品是很有效的. 相似文献
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N,N'-二取代一硫代草酰胺的合成及其与二元胺反应的研究陆忠娥,邹建平,袁于人,陈克潜(苏州大学化学系,苏州,215006)关键词N,N'-二取代一硫代草酰胺,咪唑啉,四氢嘧啶N,N'-二硫代草酰胺可与多种金属络合,而N,N'-二取代一硫代草酰胺的合... 相似文献
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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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N-甲基丙烯酰-N′-嘧啶基哌嗪及其聚合物敏化的丙烯腈光聚合 总被引:1,自引:2,他引:1
The photopolymerization of acrylonitrile (AN) sensitized by N-methacrylyl-N'-pyrimidi-nopiperazine (MPMP) and its polymer, P(MPMP) was studied kinetically. It was found that the photopolymerization rate of AN sensitized by monomeric MPMP is proportional to 0.35th power of MPMP concentration and 0.85th power of AN concentration, respectively. In the case sensitized by Polymeric MPMP, P(MPMP) is proportional to 0.30th power of P(MP-MP) concentration and 1.0 power of AN concentration, respectively. The overall activation energies for photopolymerization sensitized with MPMP and P(MPMP) were determined to be 4.71Kcal/mol and 4.58Kcal/mol,respectively.From the fluorescence analysis for P(AN) senstitized by either MPMP or P(MPMP),it was confirmed that MPMP and P(MPMP) not only sensitized the photopolymerization of AN but also entered into the P(AN) chains. 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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N-甲基丙烯酰-N'-嘧啶哌嗪与过硫酸钾引发体系引发的丙烯酰胺聚合 总被引:4,自引:0,他引:4
queous solution polymerization of acrylamide (AAm) was demonstrated by using initiation system consisting of N-methacryloyl-N '-pyrimidinopiperazine (MPMP ) and persulfate (KPS). The polymerization rate equation was obtained to beRp = Kp[MPMP]1/2 [KPS]1/2 [AAm]1.0The overall activation energy for the polymerization was calculated by Arrhenius quation to be Ea= 5.6 KJ/mol. The redox nature for the polymerization was clarified. A super high molecular weight up to 107 of PAAm was obtained by using this initiation system. From the fluorescent analysis, it was confirmed that MPMP not only acted as a component of the redox system, but also entered into the acrylamide polymer chains. 相似文献
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Xiaoxuan Liu Xiahong Zhang Xinghong Zhang Guangguo Wu Jianwen Yang Laixing Pang Zhaohua Zeng Yonglie Chen 《Journal of polymer science. Part A, Polymer chemistry》2004,42(11):2659-2665
The photoinduced solution polymerization of 4‐methacryloyl‐1,2,2,6,6‐pentamethyl‐piperidinyl (MPMP), used as a reactive hindered amine piperidinol derivative, was performed. The obtained MPMP homopolymer had a very narrow molecular weight distribution (1.06–1.39) according to gel permeation chromatography. The number‐average and weight‐average molecular weights increased linearly with the monomer conversion, this being characteristic of controlled/living free‐radical polymerizations. Electron spin resonance signals were detected in the MPMP homopolymer and in a polymer mixture solution, and they were assigned to nitroxide radicals, which were bound to the polymer chains and persisted at a level of 10?9 mol/L during the polymerization. Instead of the addition of mediated nitroxide radicals such as 2,2,6,6‐tetramethyl‐piperidinyl‐1‐oxy (TEMPO), those radicals (>N? O ·) were formed in situ during the photopolymerization of MPMP, and so the reaction mechanism was understood as being similar to that of TEMPO‐mediated controlled/living free‐radical polymerization. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 2659–2665, 2004 相似文献
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