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Synthesis of polymers having photocrosslinkable moieties for second‐order nonlinear optics
Author(s) -
Hashidate Sadahito,
Nagasaki Yukio,
Kato Masao,
Okada Shuji,
Matsuda Hiro,
Minami Nobutsugu,
Nakanisi Hachiro
Publication year - 1992
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1992.220030401
Subject(s) - cationic polymerization , monomer , materials science , copolymer , polymer , polymerization , polymer chemistry , nonlinear optics , photochemistry , optics , chemistry , composite material , laser , physics
Second‐order non‐linear optical polymers having photocrosslinkable moieties were synthesized by cationic polymerization of monomer (I) and monomer (II). The polymerization proceeded rapidly to give linear polymers in high yields. Monomer reactivity ratios were calculated to be r 1 = 0.90 and r 2 = 0.96 ( r 1 r 2 = 0.86), indicating that these monomers copolymerized through the almost ideal copolymerization mechanism. The photocrosslinking reaction of an equimolar copolymer film underwent the conversion of up to ca. 70% upon irradiation with a 500 W high‐presure mercury lamp for 5 min. The electric field induced polar orientation of the chromophores (pendant 4‐nitrophenyloxy groups) in a photocrosslinked polymer was stable for more than 10 days. This polymer exhibits a nonlinear coefficient d 33 of 5.6 × 10 ‐10 esu measured at a pumping wavelength of 1064 nm.