Dielectric relaxation phenomena and dynamics in polyoxymethylene/polyurethane/alumina hybrid nanocomposites
Dielectric relaxation phenomena and dynamics in polyoxymethylene/polyurethane/alumina hybrid nanocomposites
复制标题
DOI：
10.1002/pi.3136
复制
发表时间：
2011-12
影响因子：
3.2
通讯作者：
G. Psarras;S. Siengchin;P. K. Karahaliou;S. Georga;C. Krontiras;J. Karger‐Kocsis
中科院分区：
文献类型：
--
作者：
G. Psarras;S. Siengchin;P. K. Karahaliou;S. Georga;C. Krontiras;J. Karger‐Kocsis
采用熔融共混法制备了聚甲醛（POM）、聚氨酯（PU）和勃姆石氧化铝纳米粒子的三元混杂复合材料。采用PU胶乳预混法使PU和氧化铝粒子在POM基体中均匀分散。在这项研究中，POM/PU/勃姆石氧化铝纳米复合材料的电性能通过宽带介电谱在宽的温度（−100至150 °C）和频率（10−1至106 Hz）范围内进行了检查。数据进行了分析，通过电模量形式主义。记录的弛豫包括来自聚合物和无机增强相的贡献。在三元混合系统中，检测到五个不同的松弛过程。通过考虑相应复合材料的形态来分配和解释弛豫。特别地，它们归因于POM和/或PU的γ-模式、PU的α-模式、POM的α-模式以及界面极化过程。最后，所有记录的过程的动力学进行了检查和讨论。版权所有© 2011化学工业协会
Ternary hybrid composites composed of polyoxymethylene (POM), polyurethane (PU) and boehmite alumina nanoparticles were produced by melt blending with and without latex pre-compounding. PU latex pre-compounding was employed for the fine dispersion of both the PU and alumina particles within the POM matrix. In this study the electrical properties of the POM/PU/boehmite alumina nanocomposites were examined by means of broadband dielectric spectroscopy over a wide temperature (−100 to 150 °C) and frequency (10−1 to 106 Hz) range. Data were analysed by means of the electric modulus formalism. The recorded relaxations include contributions from both polymers and the inorganic reinforcing phase. In the ternary hybrid systems five distinct relaxation processes were detected. Relaxations were assigned and interpreted by considering the morphology of the corresponding composite. In particular, they were attributed to the γ-mode of POM and/or of PU, the α-mode of PU, the α-mode of POM and to the interfacial polarization process. Finally, the dynamics of all the recorded processes are examined and discussed. Copyright © 2011 Society of Chemical Industry