Hj. Lee et al., Synthesis and properties of nonlinear optical polymers based on poly(etherimides) for electrooptical devices, POLYM BULL, 42(4), 1999, pp. 403-409
Nonlinear optical poly(ether imides) with an adequate thermal stability has
been synthesized by direct coupling of hydroxy poly(ether imides) and NLO
chromophores with a quantitative yield. The resultant amorphous NLO poly(et
her imides) exhibited good solubility in common organic solvents, providing
optical-quality thin films by spin coating. The glass transition temperatu
res of the polymers are at around 180 degrees C. The electrooptic coefficie
nts (r(33), @1.3 mu m) of PEI-DR1 was 12.3 pm/V with an electrical poling f
ield of 100 V/mu m and it decayed about 10 % over 10 months at 90 degrees C
under atmospheric conditions.