Bimodal Polymer Brush Core鈥揝hell Barium Titanate Nanoparticles: A Strategy for High-Permittivity Polymer Nanocomposites
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- 作者：Yali Qiao ; Xiaodong Yin ; Lei Wang ; Md. Sayful Islam ; Brian C. Benicewicz ; Harry J. Ploehn ; Chuanbing Tang
- 刊名：Macromolecules
- 出版年：2015
- 出版时间：December 22, 2015
- 年：2015
- 卷：48
- 期：24
- 页码：8998-9006
- 全文大小：561K
- ISSN：1520-5835
文摘
This paper presents a novel strategy to modify the surface chemistry of barium titanate (BaTiO3, BT) with a bimodal population of oligothiophene polymer brushes using step-by-step reversible addition鈥揻ragmentation chain transfer (RAFT) polymerization. Compared with a previous strategy based on monomodal surface-tethered brushes, these hybrid nanoparticles, BaTiO3 coated with bimodal oligothiophene polymer brushes, demonstrate extremely good dispersion behaviors as dielectric nanofillers in a matrix of oligothiophene polymers. These nanodielectric composites exhibit greatly improved dielectric performance and maintain linear displacement鈥損olarization (D鈥?i>E) profiles under high applied electric fields. This promising bimodal strategy could be generalized to a variety of nanoparticles for the development of novel dielectric nanocomposite systems.