Poling Dynamics and Negligible Relaxation in Aromatic Polyurea Studied by In Situ Observation of Second-Harmonic Generation
- 1 May 1992
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 31 (5A) , L553-555
- https://doi.org/10.1143/jjap.31.l553
Abstract
The poling process has been observed by means of second-harmonic generation in aromatic polyurea prepared by vapor deposition polymerization. Polymerization from the as-grown oligomer and crystallization proceed simultaneously with an electric-field-induced alignment of the urea group at about 130°C. Consequently, the poled structure is thermally quite stable even at 200°C and shows negligible relaxation at room temperature.Keywords
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