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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Dielectric and mechanical relaxation behavior in poly(butyl methacrylate) isomers
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Dielectric and mechanical relaxation behavior in poly(butyl methacrylate) isomers

机译：聚（甲基丙烯酸丁酯）异构体的介电和机械弛豫行为

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Dielectric and mechanical spectroscopies have been used to study the dynamics in poly(butyl methacrylate) isomers (namely PnBMA, PiBMA and PtBMA). This analysis has revealed four relaxation processes: delta, gamma, beta and alpha and has allowed the observation of the evolution of molecular relaxation phenomena with the lateral chain steric hindrance. The a relaxation is associated with the glass transition of the isomers and depends strongly on the lateral chain structure. The secondary relaxation phenomena are very similar for the three isomers. Arrhenius diagrams have been plotted for the three isomers. The activation parameters have been calculated from Arrhenius equation for the sub-glass processes 8 and 7 whereas the dynamics are characterized by a Vogel-Fulcher-Tamman law for the alpha relaxations. With a deconvolution procedure for the alpha and beta processes, a departure from the Arrhenius law of the beta process in the vicinity of the merging between the alpha and P phenomena is observed for each isomer. (c) 2005 Elsevier B.V. All rights reserved.
机译：介电和机械光谱学已用于研究聚（甲基丙烯酸丁酯）异构体（即PnBMA，PiBMA和PtBMA）的动力学。该分析揭示了四个弛豫过程：δ，γ，β和α，并且可以观察到具有侧链空间位阻的分子弛豫现象的演变。弛豫与异构体的玻璃化转变有关，并且很大程度上取决于侧链结构。三种异构体的二次弛豫现象非常相似。已经绘制了三种异构体的阿累尼乌斯图。激活参数是从亚伦尼斯方程计算的，用于副玻璃过程8和7，而动力学的特征在于阿尔法弛豫的Vogel-Fulcher-Tamman定律。对于α和β过程，通过反卷积过程，可以观察到每种异构体在α和P现象合并的附近均偏离β过程的阿伦尼乌斯定律。 （c）2005 Elsevier B.V.保留所有权利。

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