The chain conformation, relaxation dynamics and thermodynamics of poly(acrylamide-co-diallyldimethylammonium chloride) solution: Dielectric analysis coupled with scaling approach
The chain conformation, relaxation dynamics and thermodynamics of poly(acrylamide-co-diallyldimethylammonium chloride) solution: Dielectric analysis coupled with scaling approach
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聚（丙烯酰胺-二烯丙基二甲基氯化铵）溶液的链构象、弛豫动力学和热力学：介电分析与缩放方法相结合
DOI：
10.1016/j.colsurfa.2015.11.065
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发表时间：
2016-02
影响因子：
5.2
通讯作者：
Zhao Kongshuang
中科院分区：
文献类型：
--
作者：
Lian Yiwei;Li Zhen;Liu Zhaobo;Xie Juan;Zhao Kongshuang
聚（丙烯酰胺-二烯丙基二甲基氯化铵）（P(AAm-co-DADMAC)）水溶液的介电性能分别在 40 Hz 至 110 MHz 频率范围内作为浓度和温度的函数进行测量。与均聚物溶液的介电行为不同（在聚（二烯丙基二甲基氯化铵）（PDADMAC）溶液中仅在 MHz 左右观察到一种介电弛豫，而在聚丙烯酰胺（PAAm）均聚物溶液中未观察到可检测到的介电弛豫），在 P（AAm-co-DADMAC）溶液中在 700 kHz 和 MHz 左右观察到两种介电弛豫，它们分别被称为低频和高频弛豫。这两个弛豫的弛豫参数（介电增量和弛豫时间，通过用科尔-科尔方程拟合介电谱获得）显示出与共聚物浓度的比例关系。关于共聚物溶液动力学的信息是根据标度理论对这两种弛豫机制的讨论得到的：低频和高频弛豫分别归因于凝聚态和游离反离子的涨落；这两种抗衡离子的波动范围揭示了共聚物溶液中存在不同的链构象。针对 P(AAm-co-DADMAC) 溶液中介电弛豫对温度的依赖性，利用 Eyring 方程从弛豫时间计算出这两种弛豫的热力学参数、活化焓和熵。还讨论了介电增量的温度依赖性。文中适当的地方从分子结构的差异角度讨论了P(AAm-co-DADMAC)和PDADMAC溶液介电性能的浓度和温度依赖性的比较。
Dielectric properties of poly(acrylamide-co-diallyldimethylammonium chloride) (P(AAm-co-DADMAC)) aqueous solution have been measured as a function of concentration and temperature over a frequency range from 40 Hz to 110 MHz, respectively. Different from the dielectric behavior of homopolymers solutions (only one dielectric relaxation was observed in poly(diallyldimethylammonium chloride) (PDADMAC) solution around MHz, and no detectable dielectric relaxation is observed in polyacrylamide (PAAm) homopolymer solution), two dielectric relaxations are observed in P(AAm-co-DADMAC) solution around 700 kHz and MHz, and they are named low- and high-frequency relaxation, respectively. The relaxation parameters (dielectric increment and relaxation time, obtained by fitting the dielectric spectra with the Cole–Cole equation) of these two relaxations show scaling relations with the copolymer concentration. The information about the dynamics of copolymer solution are got from the discussion of the mechanisms of these two relaxations in light of the scaling theory: the low- and high-frequency relaxations are ascribed to the fluctuation of condensed and free counterions, respectively; the fluctuation ranges of these two kinds counterions reveal the different chain conformations exist in the copolymer solution. For the dependence of dielectric relaxation on temperature in P(AAm-co-DADMAC) solution, the thermodynamic parameters, activation enthalpies and entropies, of these two relaxations are calculated from the relaxation time by means of the Eyring equation. The temperature dependences of dielectric increments are also discussed. The comparison about the concentration and temperature dependences of dielectric properties between P(AAm-co-DADMAC) and PDADMAC solution are discussed from the perspective of the difference of molecular structure in the proper place of the text.
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影响因子：
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作者：
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通讯作者：
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作者：
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