Structural and electrical characterization of spin-coated polyurea thin films

被引：10

作者：

Morimoto, Masahiro ^{[1
]}

Koshiba, Yasuko ^{[1
]}

Misaki, Masahiro ^{[1
]}

Ishida, Kenji ^{[1
]}

机构：

[1] Kobe Univ, Grad Sch Engn, Dept Chem Sci & Engn, Nada Ku, Kobe, Hyogo 6578501, Japan

来源：

POLYMER | 2015年 / 79卷

关键词：

Polyurea; Spin-coating; Pyroelectricity; VAPOR-DEPOSITION POLYMERIZATION; ROOM-TEMPERATURE FERROELECTRICITY; POLY(VINYLIDENE FLUORIDE); POLARIZATION REVERSAL; VINYLIDENE FLUORIDE; AROMATIC POLYUREA; PYROELECTRICITY; HYSTERESIS; POLYMERS; CRYSTAL;

D O I：

10.1016/j.polymer.2015.10.005

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Thin-film fabrication of polyurea is hindered by poor solubility in most organic solvents. We fabricated spin-coated thin films of polyurea and investigated the structural and electrical properties of the films. The as-spun films had rough surfaces and relatively high crystallinity with 4.5 nm grains, while melt-quenched films were smooth and lower in crystallinity with 2.7 nm grains. Residual solvent remained in the films at temperatures above the boiling point of the solvent. The quenched polyurea films exhibited large current peaks originating from activated impurity charges from the residual solvent in the current density-electric field curves. The pyroelectric coefficient of the spin-coated polyurea films was estimated to be 4.13 mu C/m(2)K. The polyurea films maintained pyroelectricity even after the application of an electric field, thereby exhibiting potential applicability in pyroelectric devices with annealing to remove the impurity charges. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：128 / 134

页数：7

共 43 条

[1] Effect of Thermal History on the Microstructure of a Poly(tetramethylene oxide)-Based Polyurea [J].