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首页> 外文期刊>Journal of Applied Polymer Science >FORMATION AND STRUCTURE OF POLYACRYLAMIDE GELS
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FORMATION AND STRUCTURE OF POLYACRYLAMIDE GELS

机译：聚丙烯酰胺凝胶的形成与结构

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摘要

Acrylamide and N,N'-methylenebis(acrylamide) (AAm-Bis) copolymerization has been investigated in water at a monomer concentration of 1.8 w/v %. Conversion of monomer and pendant vinyl groups was measured as a function of the reaction time up to the onset of macrogelation. Experimental results indicate that 80% of pendant vinyl groups are consumed by cyclization reactions. When the monomer concentration was kept constant at 1.8%, the critical conversion at the gel point shows a minimum at 7.5 mol % Bis. The equilibrium degree of swelling of the polyacrylamide (PAAm) gels is independent of their crosslinker content. Calculation results show that the average reactivity of pendant vinyl groups for intermolecular links decreases as the Bis concentration increases. All these results suggest formation of PAAm microgels prior to the onset of macrogelation. As the reaction proceeds, microgels are connected to a macrogel through their peripheral pendant vinyls and radical ends, whereas those in their interior remain intact. The microgels seem to act as the junction points of the final inhomogeneous networks. (C) 1996 John Wiley & Sons, Inc. [References: 38]
机译：在水中以1.8 w / v％的单体浓度研究了丙烯酰胺和N，N'-亚甲基双（丙烯酰胺）（AAm-Bis）共聚。直至大凝胶化开始，测量单体和侧基乙烯基的转化率与反应时间的关系。实验结果表明，环化反应消耗了80％的乙烯基侧基。当单体浓度保持恒定在1.8％时，在凝胶点的临界转化率显示最低为7.5 mol％Bis。聚丙烯酰胺（PAAm）凝胶的平衡溶胀度与交联剂含量无关。计算结果表明，悬垂乙烯基对分子间连接的平均反应性随Bis浓度的增加而降低。所有这些结果表明在大胶凝作用开始之前形成了PAAm微凝胶。随着反应的进行，微凝胶通过其周围的侧基乙烯基和自由基末端与大凝胶相连，而内部的那些则保持完整。微凝胶似乎充当最终不均匀网络的连接点。 （C）1996 John Wiley＆Sons，Inc. [参考：38]

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