电介质
纳米复合材料
材料科学
无定形固体
聚合物
结晶
聚苯乙烯
堆积
多孔性
化学工程
分子
高分子化学
复合材料
结晶学
化学
有机化学
光电子学
工程类
作者
Lili Liu,Yuan Yuan,Yawen Huang,Hongtao Yu,Junxiao Yang
摘要
The low dielectric constant (ε) of polyhedral oligomeric silsesquioxanes (POSS) was generally attributed to its porous structure. In this work, we propose a new mechanism for the low ε of the POSS-based nanocomposites from the interfacial effect point of view. The investigation on a typical nanocomposite, polystyrene/POSS, found that POSS molecules take crystallization to form crystalline nanoplatelets (PCPs) in PS. Correspondingly, the dielectric constant can be reduced to around 2.30. A detailed investigation excluded the possible influence of the chain stacking and chain mobility of the polymers on ε. It was demonstrated, for the first time, that the ε shows a high correlation with interface area which is reflected by a rigid amorphous fraction (RAF), thus revealing the key role of the interfacial effect on reducing the low dielectric constant.
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