Poling dynamics and negligible relaxation in aromatic polyurea studied by in situ observation of second-harmonic generation

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...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 31; no. 5A; pp. L553 - L555
Main Authors NAGAMORI, H, KAJIKAWA, K, TAKEZOE, H, FUKUDA, A, UKISHIMA, S, IIJIMA, M, TAKAHASHI, Y, FUKADA, E
Format Journal Article
LanguageEnglish
Published Tokyo Japanese journal of applied physics 1992
Subjects
Applied sciences
Electrical, magnetic and optical properties
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Polymerization
Urea polymer
Relaxation
Polarity
Vapor deposition
Second harmonic
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Summary: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.
ISSN:0021-4922
1347-4065
DOI:10.1143/jjap.31.l553