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丙烯酰胺—丙炮酸甲酯—2—丙烯酰胺基—2—甲基丙磺酸共聚物的合成及表征 总被引:4,自引:0,他引:4
以丙烯酰胺,丙烯酸甲酯和2-丙烯酰胺基-2-甲基丙磺酸为原料,通过水溶液共聚,合成了一种新的三元共聚物。研究了影响共聚反应的因素,并对其结构进行了表征。 相似文献
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丙烯酰胺与N,N′-亚甲基双丙烯酰胺的共聚反应研究 总被引:4,自引:0,他引:4
本文利用凝胶模量测定法、气相色谱法和紫外光谱法对丙烯酰胺与N,N’-亚甲基双丙烯酰胺水溶液共聚反应进行了研究,证实了N,N’-亚甲基双丙烯酰胺的反应活性明显大于丙烯酰胺的反应活性。用气相色谱法测得单体的竞聚率分别为rAM=0.117,,rBis=5.756;用紫外光谱法研究了聚合反应中氧化还原引发剂浓度和反应温度对聚合反应速率的影响,得出共聚反应速率方程中,氧化剂的方次为0.66,还原剂浓度的方次为0.55,并求出共聚反应表现活化能为37.1KJ/mol。 相似文献
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聚丙烯酰胺-聚乙二醇-水体系相图及丙烯酰胺单体在两相中的分配 总被引:10,自引:0,他引:10
聚丙烯酰胺(PAAm)和聚乙二醇(PEG)两种水溶液混合时能形成双水相体系,其中上层为PEG富集相,下层为PAAm和PEG的混合相.用凝胶渗透色谱(GPC)法和浊度滴定法研究了PAAm-PEG-H2O双水相体系的相图,结果表明,随着PEG分子量的升高,体系的分相浓度下降.在PAAm-PEG20000-H2O体系中,随着体系温度升高,分相浓度先下降后升高,55℃时分相浓度最低.丙烯酰胺(AAm)单体能在两相中发生相分配,分配系数随着PAAm浓度和平衡温度的增加而增大,随着PEG浓度的增加而下降. 相似文献
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在水介质中,研究了新型的过氧化氢/N-甲基苯胺盐酸盐引发体系对 AM 与 PVA 的接枝共聚。产物经紫外光谱、红外光谱和 ~1H-核磁共振进行表征,并提出了引发机理。 相似文献
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应用n级等摩尔浓度反应的热动力学理论,在30℃和40℃下研究了丙烯酰胺在水溶液中和CTAB胶束溶液中由亚硫酸钠引发的聚合反应动力学.讨论了引发剂和CTAB的浓度对聚丙烯酰胺分子量的影响。 相似文献
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近年来,超临界二氧化碳(sc-CO2)在聚合反应中的应用受到了越来越多的关注。本文主要综述了以sc-CO2为反应介质的自由基聚合、阳离子聚合、过渡金属催化聚合、热致开环聚合、溶胶-凝胶聚合以及氧化耦合聚合的研究概况。一系列研究结果表明sc-CO2是非常有前途的反应溶剂,在高分子合成领域将会有更加广阔的应用前景。 相似文献
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A. N. Mudrov A. S. Tishchenko T. A. Ageeva O. I. Koifman 《Russian Journal of General Chemistry》2016,86(6):1510-1514
A comparative study of radical polymerization of styrene under thermal and microwave heating conditions has been carried out. The polymerization reaction orders with respect to the monomer and initiator concentrations and the polymerization rate constants have been determined. It has been found that non-thermal microwave effects are not manifested during styrene polymerization, because styrene is a weakly polar substance. 相似文献
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James M. Pearson 《高分子科学杂志,A辑:纯化学与应用化学》2013,50(6):1029-1046
The ionic polymerization of vinyl monomers possessing aromatic and heterocyclic functional groups has not been studied in any systematic fashion. Only in a few isolated cases have detailed mechanistic and structural studies been reported. The anionic polymerization of a number of vinylanthracene monomers has recently been investigated and some rationalization of this system is presented. The cationic and anionic polymerization of the N-, 3-, and 2-vinylcarbazole series of monomers is discussed in some detail. The important role of vinyl aromatic/vinyl heterocyclic monomers, i.e., diphenylethylene and the vinylcarbazoles, in elucidating the mechanistic aspects of cationic polymerization, “change transfer” polymerization, and photoionic polymerization is considered. 相似文献
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Shengsheng Liu Ayusman Sen 《Journal of polymer science. Part A, Polymer chemistry》2004,42(24):6175-6192
The living/controlled copolymerization of methyl acrylate with 1‐alkenes and norbornene derivatives through several radical polymerization techniques has been achieved. These techniques include atom transfer radical polymerization, reversible addition–fragmentation transfer polymerization, nitroxide‐mediated polymerization, and degenerative transfer polymerization. These systems display many of the characteristics of a living polymerization process: the molecular weight increases linearly with the overall conversion, but the polydispersity remains low. Novel block copolymers have been synthesized through the sequential addition of monomers or chain extension. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 6175–6192, 2004 相似文献