A comparative study of the stimuli-responsive properties of DMAEA and DMAEMA containing polymers
A comparative study of the stimuli-responsive properties of DMAEA and DMAEMA containing polymers
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DOI：
10.1002/pola.26730
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发表时间：
2013-08-15
影响因子：
--
通讯作者：
O'Reilly, Rachel K.
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文献类型：
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作者：
Cotanda, Pepa;Wright, Daniel B.;O'Reilly, Rachel K.
研究了丙烯酸二甲氨基乙酯（DMAEA）与丙烯酸甲酯（MA）及其甲基丙烯酸酯（MMA）的加成-断裂链转移可逆共聚反应，并对其分子量和多分散性进行了较好的控制。在0 - 75% MA（或MMA）范围内对共聚物的组成进行了筛选。通过测量浊点（CP）和酸解常数（pK(a)），研究了这些pH和温度敏感共聚物在水溶液中的行为。由于电荷之间的距离较大，共聚物中疏水单体的较高掺入导致了pK(a)值的增加，从而促进了相邻氮的质子化，丙烯酸酯和甲基丙烯酸酯衍生物。在纯水中研究了共聚物的CP行为，发现由于DMAEA的自水解，丙烯酸酯聚合物的CP值是不可复制的。因此，进行了动力学研究来量化在不同温度和聚合物浓度下的自水解程度，以探索这些多功能聚合物的全部潜力和应用。(c) 2013 Wiley Periodicals, Inc.；j .变异较大。科学。A部分：Polym。化学，2013,51,3333-3338
Reversible addition-fragmentation chain transfer copolymerization of dimethylaminoethyl acrylate (DMAEA) and methyl acrylate (MA) and their methacrylate counterparts (MMA) has been performed with good control over molecular weight and polydispersity. A screening in composition of copolymers has been performed from 0 to 75% of MA (or MMA). The behavior of these pH and temperature-sensitive copolymers has been studied in aqueous solution by measuring the cloud point (CP) and the acid dissociation constants (pK(a)). The higher incorporation of the hydrophobic monomer in the copolymer resulted in an increase in the pK(a) values due to the larger distance between charges thus facilitating the protonation of adjacent nitrogens for both, the acrylate and methacrylate derivatives. The CP behavior of the copolymers has been studied in pure water and the CP values have been found to be irreproducible for the acrylate polymers, as a consequence of the self-hydrolysis of DMAEA. Hence, kinetic studies have been performed to quantify the degree of self-hydrolysis at different temperatures and polymer concentrations to explore the full potential and application of these versatile polymers. (c) 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 3333-3338