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首页> 外文期刊>Colloids and Surfaces, A. Physicochemical and Engineering Aspects >Effect of chemical composition on properties of pH-responsive poly(acrylamide-co-acrylic acid) microgels prepared by inverse microemulsion polymerization
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Effect of chemical composition on properties of pH-responsive poly(acrylamide-co-acrylic acid) microgels prepared by inverse microemulsion polymerization

机译：化学组成对反相微乳液聚合制备pH响应型聚丙烯酰胺-丙烯酸共聚物微凝胶性能的影响

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摘要

In this research, a series of pH-responsive microgels based on acrylamide (AM), acrylic acid (AA) as the main monomers, and N,N'-methylenebisacrylamide as a divinyl cross-linking agent, have been prepared by inverse microemulsion polymerization. The effect of chemical composition of poly(acrylamide-co-acrylic acid) (P(AM-co-AA)) on hydrodynamic diameters, morphology, swelling ratios and pH-responsive behaviour and thermal properties of microgels were discussed. With an increase of the mole percentages of AA in the feed ratio, the microgels have higher swelling ratios. The TEM photographs show that the spherical morphology of the microgels are regular relatively. Comparing with PAM microgels, number-average diameters of P(AM-co-AA) microgels were larger because of the presence of AA chain segment in the polymer chain. Turbidities of microgels determined through UV-vis spectrophotometer indicate that the microgels exhibit favourable pH-responsive behaviour, and responsive pH value is related to the dissociation constant of AA. Moreover, thermal stable properties of microgels were confirmed by differential scanning calorimeter. It was observed that an increase in the mole percentages of AA in the feed ratio provided lower glass transition temperature and thermal decomposition temperature of pH-responsive microgels.
机译：本研究通过反相微乳液聚合制备了一系列以丙烯酰胺（AM），丙烯酸（AA）为主要单体，N，N'-亚甲基双丙烯酰胺为二乙烯基交联剂的pH响应微凝胶。 。讨论了聚（丙烯酰胺-共丙烯酸）（P（AM-co-AA））的化学组成对微凝胶的流体动力学直径，形态，溶胀比以及pH响应行为和热性能的影响。随着进料比中AA摩尔百分比的增加，微凝胶具有更高的溶胀比。 TEM照片表明，微凝胶的球形形态相对规则。与PAM微凝胶相比，P（AM-co-AA）微凝胶的数均直径较大，这是因为聚合物链中存在AA链段。通过紫外可见分光光度计测定的微凝胶的浊度表明该微凝胶表现出有利的pH响应行为，并且响应pH值与AA的解离常数有关。此外，通过差示扫描量热仪确认了微凝胶的热稳定性。观察到，进料比中AA摩尔百分比的增加提供了较低的玻璃化转变温度和pH响应性微凝胶的热分解温度。

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