Fourier Transform Infra Red Observation of the Orientation of Dipolar Urea Bonds in Polyurea during Corona Poling
Fourier Transform Infra Red Observation of the Orientation of Dipolar Urea Bonds in Polyurea during Corona Poling
复制标题
电晕极化过程中聚脲偶极脲键取向的傅里叶变换红外观察
DOI：
10.1143/jjap.34.l65
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发表时间：
1995
影响因子：
1.5
通讯作者：
Eiichi Fukada Eiichi Fukada
中科院分区：
文献类型：
--
作者：
M. Iijima;S. Ukishima;K. Iida;Yoshikazu Takahashi;Eiichi Fukada Eiichi Fukada
以4，4-二氨基二苯甲烷(MDA)和4，4-二苯基甲烷二异氰酸酯(MDI)为原料，采用气相沉积聚合法制备了聚脲薄膜。聚脲包括含有NH和CO偶极基团的尿素键。用傅里叶变换红外光谱(FT-IR)观察到了电晕极化引起的偶极取向。在二极管电晕极化中，偶极子在针电极正下方的区域对准效果最好，偶极子的取向度随着与该电极距离的增加而减小。在三极管电晕极化中，在针状电极和平面电极之间设置栅极，在整个表面上均匀地完成定向。然而，与这一假设相反，通过FT-IR图谱分析，我们发现偶极取向遵循网格电极结构的网状结构的形式。
Polyurea thin films were prepared using 4,4-diaminodiphenyl methane (MDA) and 4,4-diphenyl methane diisocyanate (MDI), by vapor deposition polymerization. Polyureas include urea bonds which contain NH and CO dipolar groups. The dipole orientation which was caused by corona poling was observed by Fourier Transform Infra-Red [FT-IR] reflectance. In diode corona poling, the dipoles are aligned best in the area directly below the needle electrode, with the degree of dipole orientation decreasing in proportion to increasing distance from this electrode. In triode corona poling, a grid electrode is set up between the needle electrode and planar electrode, and orientation is accomplished uniformly over the entire surface. Contrary to this assumption, however, we found, through FT-IR mapping analysis, that dipole orientation follows the form of a net mesh structured like a grid electrode.