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Synthesis and properties of a second-order nonlinear optical side-chain polyimide

✍ Scribed by Yoshimasa Sakai; Mitsuru Ueda; Takashi Fukuda; Hiro Matsuda

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
222 KB
Volume
37
Category
Article
ISSN
0887-624X

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✦ Synopsis

A thermal stable aromatic polyimide (PI) with side-chain second-order nonlinear optical (NLO) chromophores has been developed. The PI was prepared by the ring-opening polyaddition of 4,4Ј-(hexafluoroisopropylidene)diphthalic anhydride with a new diamine having two N-ethyl-N-[4-[(6-chlorobenzothiazol-2-yl)diazenyl]phenyl]-2aminoethanol units as the NLO chromophore, followed by poling during or after the thermal imidization process. The resulting PI had number and weight-average molecular weights (M n , M w ) of 25,000 and 80,000, respectively, and a relatively high glass transition temperature of 180Β°C. The second harmonic coefficient (d 33 ) of PI at the wavelength of 1.064 m was 138 pm/V (329.6 Ο« 10 Οͺ9 esu) and remained unchanged at elevated temperatures. The corona poling process of the NLO-substituted poly(amic acid) to the PI was also studied in detail by measuring the second harmonic generation (SHG) from the polymer films.

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