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Cross‐polarization with magic‐angle spinning kinetics and impedance spectroscopy study of proton mobility, local disorder, and thermal equilibration in hydrogen‐bonded poly(methacrylic acid)
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2020-10-15 , DOI: 10.1002/pol.20200592 Laurynas Dagys 1, 2 , Vaidas Klimkevičius 3 , Vytautas Klimavicius 1, 4 , Sergejus Balčiūnas 5 , Jūras Banys 5 , Vytautas Balevicius 1
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2020-10-15 , DOI: 10.1002/pol.20200592 Laurynas Dagys 1, 2 , Vaidas Klimkevičius 3 , Vytautas Klimavicius 1, 4 , Sergejus Balčiūnas 5 , Jūras Banys 5 , Vytautas Balevicius 1
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The 1H–13C cross‐polarization with magic‐angle spinning (CP MAS) kinetics was studied in poly(methacrylic acid) (PMAA) having the purpose to track the links between the local order in the main chain and the proton dynamics in peripheral hydrogen bond networks. The experimental CP MAS kinetic curves were analyzed applying the models of isotropic and anisotropic spin‐diffusion with thermal equilibration. The fractal dimension Dp ≈ 3 was deduced that indicates that PMAA behaves as an isotropic 3D‐system. No proton conductivity in the neat PMAA was deduced from the impedance spectroscopy data analyzing the frequency dependences of the complex dielectric permittivity. The value of local order parameter S = 0.70 for CH2 in PMAA occupies an intermediate position between 0.63 and 0.85 deduced for CH2 sites in the main chains of poly(vinyl phosphonic acid) and poly(2‐hydroxyethyl methacrylate), that is, the true proton conductor and the polymer that contains the H‐bond network, however, no proton conductivity, respectively.
中文翻译：
氢键键合聚（甲基丙烯酸）的魔角旋转动力学和阻抗谱交叉极化研究质子迁移率，局部无序和热平衡
在聚（甲基丙烯酸）（PMAA）中研究了带有魔角旋转（CP MAS）动力学的1 H– 13 C交叉极化，目的是追踪主链中的局部顺序与质子动力学之间的联系。外围氢键网络。使用具有热平衡的各向同性和各向异性自旋扩散模型分析了实验性CP MAS动力学曲线。分形维数d p ≈3推断出指示PMAA表现为各向同性的3D系统。通过分析复杂介电常数的频率相关性的阻抗谱数据，未得出纯净PMAA中的质子电导率。CH的本地订单参数S的值= 0.70在PMAA中的2占据了0.63-0.85的中间位置，该位置是聚乙烯基膦酸和聚甲基丙烯酸2-羟乙酯主链中CH 2位的推导，即真正的质子导体和含有H的聚合物键网络，但分别没有质子传导性。
更新日期：2020-12-02
中文翻译：
氢键键合聚（甲基丙烯酸）的魔角旋转动力学和阻抗谱交叉极化研究质子迁移率，局部无序和热平衡
在聚（甲基丙烯酸）（PMAA）中研究了带有魔角旋转（CP MAS）动力学的1 H– 13 C交叉极化，目的是追踪主链中的局部顺序与质子动力学之间的联系。外围氢键网络。使用具有热平衡的各向同性和各向异性自旋扩散模型分析了实验性CP MAS动力学曲线。分形维数d p ≈3推断出指示PMAA表现为各向同性的3D系统。通过分析复杂介电常数的频率相关性的阻抗谱数据，未得出纯净PMAA中的质子电导率。CH的本地订单参数S的值= 0.70在PMAA中的2占据了0.63-0.85的中间位置，该位置是聚乙烯基膦酸和聚甲基丙烯酸2-羟乙酯主链中CH 2位的推导，即真正的质子导体和含有H的聚合物键网络，但分别没有质子传导性。
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