Investigation of dielectric breakdown in silica-epoxy nanocomposites using designed interfaces

被引:35
|
作者
Bell, Michael [1 ]
Krentz, Timothy [2 ]
Nelson, J. Keith [2 ]
Schadler, Linda [2 ]
Wu, Ke [3 ]
Breneman, Curt [3 ]
Zhao, Su [4 ]
Hillborg, Henrik [4 ]
Benicewicz, Brian [1 ]
机构
[1] Univ South Carolina, Dept Chem & Biochem, Columbia, SC 29205 USA
[2] Rensselaer Polytech Inst, Dept Mat Sci & Engn, Troy, NY 12180 USA
[3] Rensselaer Polytech Inst, Dept Chem & Chem Biol, Troy, NY 12180 USA
[4] ABB AB, Corp Res, SE-72178 Vasteras, Sweden
关键词
Nanodielectric; Surface modification; RAFT polymerization; Epoxy; Dielectric breakdown strength; Ligand engineering; POLYMER NANOCOMPOSITES; RADICAL POLYMERIZATION; ELECTRICAL BREAKDOWN; AVALANCHE BREAKDOWN; STRENGTH; BEHAVIOR; NANOPARTICLES; POLYETHYLENE; INSULATION;
D O I
10.1016/j.jcis.2017.02.001
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Adding nano-sized fillers to epoxy has proven to be an effective method for improving dielectric breakdown strength (DBS). Evidence suggests that dispersion state, as well as chemistry at the filler-matrix interface can play a crucial role in property enhancement. Herein we investigate the contribution of both filler dispersion and surface chemistry on the AC dielectric breakdown strength of silica-epoxy nanocomposites. Ligand engineering was used to synthesize bimodal ligands onto 15 nm silica nanoparticles consisting of long epoxy compatible, poly(glycidyl methacrylate) (PGMA) chains, and short, pi-conjugated, electroactive surface ligands. Surface initiated RAFT polymerization was used to synthesize multiple graft densities of PGMA chains, ultimately controlling the dispersion of the filler. Thiophene, anthracene, and terthiophene were employed as pi-conjugated surface ligands that act as electron traps to mitigate avalanche breakdown. Investigation of the synthesized multifunctional nanoparticles was effective in defining the maximum particle spacing or free space length (L-f) that still leads to property enhancement, as well as giving insight into the effects of varying the electronic nature of the molecules at the interface
引用
收藏
页码:130 / 139
页数:10
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