Transparent and high permittivity films of poly(methyl methacrylate)-grafted 7 nm barium titanate particles prepared by surface-initiated atom transfer radical polymerization

被引：9

作者：

Iwata, Naoto ^{[1
]}

Sato, Osamu ^{[2
]}

Ohno, Kohji ^{[3
]}

Sakajiri, Koichi ^{[1
]}

Kang, Sungmin ^{[1
]}

Tokita, Masatoshi ^{[1
]}

机构：

[1] Tokyo Inst Technol, Dept Organ & Polymer Mat, Meguro Ku, Tokyo 1528552, Japan

[2] LG Display Co Ltd, Japan Lab, Tokyo 1400002, Japan

[3] Kyoto Univ, Inst Chem Res, Uji, Kyoto 6110011, Japan

来源：

POLYMER | 2015年 / 81卷

关键词：

Atom transfer radical polymerization; Permittivity; Barium titanate; Poly(methyl methacrylate); HIGH-DIELECTRIC-CONSTANT; NANOPARTICLES; SUSPENSIONS; STRENGTH; BRUSH; SIZE;

D O I：

10.1016/j.polymer.2015.11.010

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Transparent and high permittivity films were prepared by melt pressing poly(methyl methacrylate) (PMMA)-grafted 7 nm barium titanate (BT) particles. PMMA chains with molecular weights of 32-40 kDa were grafted on BT particle surfaces at a density of 0.2-0.7 chains nm(-1) through surface initiated atom transfer radical polymerization of methyl methacrylate. This yielded BT/PMMA composites with BT volume fractions (4) ranging from 3.2% to 10%. In melt-pressed BT/PMMA composite films, BT particles were well-dispersed and exhibited high transmittance at 550 nm, with the values standardized for 100 mm thickness being 80%. The relative permittivity of the films at 1 kHz and 25 degrees C increased to 4.1 upon increasing 4 to 10%, according to Lichtenecker's logarithmic mixture formula, while the loss tangent remained as low as 0.04. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：23 / 28

页数：6

共 20 条

[1] New Antifouling Silica Hydrogel [J].