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首页> 外文期刊>Journal of Applied Polymer Science >Dynamics of in situ synthetized silver-epoxy nanocomposites as studied by dielectric relaxation spectroscopy
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Dynamics of in situ synthetized silver-epoxy nanocomposites as studied by dielectric relaxation spectroscopy

机译：介电弛豫谱研究原位合成银-环氧纳米复合材料的动力学

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In situ synthetized silver-photocurable epoxy resin nanocomposites were analyzed by dielectric spectroscopy to study the local dynamics at temperatures well below the glass-transition temperature and the effect of silver nanoparticles on them. Two secondary processes, β and γ, were detected both for the neat matrix and nanocomposites. Relaxation times of the β secondary relaxation, obtained by fitting to Havriliak-Negami equation, were lower in the nanocomposites, as well as the activation energies calculated from the Arrhenius temperature dependence of relaxation times, due to the plasticization effect of the trapped solvent. The electric modulus formalism was used to detect the interfacial or MWS polarization, present both in the neat matrix and in the nanocomposites due to heterogeneities and interfaces. The activation energy of this relaxation increased with nanoparticle content, thus indicating an increase of the heterogeneities due to the nanoparticles.
机译：通过介电光谱法对原位合成的银光固化环氧树脂纳米复合材料进行了分析，以研究远低于玻璃化转变温度的温度下的局部动力学以及银纳米颗粒对其的影响。对纯基质和纳米复合材料都检测到两个次级过程，即β和γ。通过拟合Havriliak-Negami方程获得的β二次弛豫的弛豫时间在纳米复合材料中更低，并且由于捕获溶剂的增塑作用，还根据弛豫时间的阿雷尼乌斯温度依赖性计算出了活化能。电模量形式学用于检测由于非均质性和界面而存在于纯基质和纳米复合物中的界面或MWS极化。这种弛豫的活化能随着纳米颗粒含量的增加而增加，从而表明由于纳米颗粒的异质性增加。

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