M. Iijima et al., FOURIER-TRANSFORM INFRARED OBSERVATION OF THE ORIENTATION OF DIPOLAR UREA BONDS IN POLYUREA DURING CORONA POLING, JPN J A P 2, 34(1A), 1995, pp. 65-68
Polyurea thin films were prepared using 4,4-diaminodiphenyl methane (M
DA) and 4,4-diphenyl methane diisocyanate (MDI), by vapor deposition p
olymerization. Polyureas include urea bonds which contain NH and CO di
polar groups. The dipole orientation which was caused by corona poling
was observed by Fourier Transform Infra-Red [FT-IR] reflectance. In d
iode corona poling, the dipoles are aligned best in the area directly
below the needle electrode, with the degree of dipole orientation decr
easing in proportion to increasing distance from this electrode. In tr
iode corona poling, a grid electrode is set up between the needle elec
trode and planar electrode, and orientation is accomplished uniformly
over the entire surface. Contrary to this assumption, however, we foun
d, through FT-IR mapping analysis, that dipole orientation follows the
form of a net mesh structured like a grid electrode.