A Dynamic Mechanical and Dielectric Relaxation Study of PP-g-MAH/Clay Nanocomposites

Amol Ridhore, J. Jog
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引用次数: 8

Abstract

The relaxations in maleic anhydride grafted polypropylene (PPgMAH) and its nanocomposite based on organi- cally modified layered silicates were investigated using dynamic mechanical thermal analysis and dielectric relaxation spectroscopy. The results of dynamic mechanical thermal analysis showed that the incorporation of clay in the polymer matrix resulted in two relaxations corresponding to the glass transition and a high temperature transition. In nanocompo- sites, the incorporation of clay resulted in reduction of the loss modulus peak area for the glass transition peak suggesting decreased content of mobile amorphous phase. An increase in the area of the high temperature transition was noted and associated with the presence of rigid amorphous phase. The dielectric measurements indicated presence of a relaxation at high frequency side for the PPgMAH whereas in nanocomposite two relaxations in the low frequency side were observed namely MWS relaxation or the interfacial polarization of the polymer and clay followed by α RAP relaxation due to relaxa- tion of rigid amorphous phase. The presence of rigid amorphous phase was attributed to the strong bonding between the MAH groups of PPgMAH and the clay surface.
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PP-g-MAH/粘土纳米复合材料的动态力学和介电弛豫研究
采用动态力学热分析和介电弛豫光谱研究了马来酸酐接枝聚丙烯(PPgMAH)及其有机改性层状硅酸盐纳米复合材料的弛豫特性。动态力学热分析结果表明,粘土在聚合物基体中的掺入导致了对应于玻璃化转变和高温转变的两个弛豫。在纳米复合材料中,粘土的掺入导致玻璃化转变峰的损耗模量峰面积减小,表明流动非晶相的含量减少。注意到高温转变面积的增加,并与刚性非晶相的存在有关。电介质测量表明PPgMAH在高频侧存在弛豫,而在纳米复合材料中,在低频侧观察到两个弛豫,即MWS弛豫或聚合物和粘土的界面极化,然后是刚性非晶相弛豫引起的α RAP弛豫。刚性非晶相的存在是由于PPgMAH的MAH基团与粘土表面的强结合。
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