Study of the temperature-induced aggregation of polyoxometalate-poly(N,N-diethylacrylamide) hybrids in water
Study of the temperature-induced aggregation of polyoxometalate-poly(N,N-diethylacrylamide) hybrids in water
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DOI：
10.1016/j.polymer.2014.12.013
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发表时间：
2015-01
期刊：
影响因子：
4.6
通讯作者：
J. Haye;A. D. Costa;Gaëlle Pembouong;L. Ruhlmann;Bernold Hasenknopf;Emmanuel Lacôte;J. Rieger
中科院分区：
文献类型：
--
作者：
J. Haye;A. D. Costa;Gaëlle Pembouong;L. Ruhlmann;Bernold Hasenknopf;Emmanuel Lacôte;J. Rieger
本文利用差示扫描量热法、动态光散射和低温透射电镜研究了Dawson聚氧乙烯酸酯-聚（N，N-二乙基丙烯酰胺）杂化物（POM-PDEAAm）水溶液的温度诱导相变。通常，PDEAAm在水中的典型温敏聚集被转移到杂化物中。研究了在转变温度以下和以上的溶液中化合物的组织，并获得了聚集机制的宝贵见解。阐明了聚合物链端、带负电荷的POM亚基的抗衡离子的性质和POM的重量分数的影响，揭示了POM的抗衡离子的强烈影响。因此，温度和阳离子的性质是可用于控制缀合物性质的两个外部因素。
In this article, we study the temperature-induced phase transition of aqueous solutions of tailor-made Dawson polyoxometalate-poly(N,N-diethylacrylamide) hybrids (POM-PDEAAm) by means of differential scanning calorimetry, dynamic light scattering and cryo-TEM microscopy. Generally, the typical thermoresponsive aggregation of the PDEAAm in water was transferred to the hybrids. The organization of the compounds in solution below and above the transition temperature was studied, and precious insights in the aggregation mechanisms were obtained. The impact of the polymer chain-ends, the nature of the counterions of the negatively charged POM subunits and the weight fraction of the POM was elucidated, revealing a strong influence of the POM's counter-ions. Temperature and nature of the cations are thus two external factors that can be used to control the properties of the conjugates.