MODULAR HIGH-T-G 2ND-ORDER POLYMERIC NONLINEAR-OPTICAL MATERIALS - POLYFUNCTIONAL EPOXIDE AND DIISOCYANATE CROSS-LINKED CHROMOPHORIC POLYHYDROXYSTYRENES

The synthesis of the chiral, donor-acceptor substituted, second-order NLO chromophore (S)-(+)-N-p-(4-nitrostyryl)phenylprolinol (NSP) (mu beta(vec)(calc)=1050x10(-30) D cm(5)/esu at 1.17 eV) and its covalent attachment via ether linkages to the glassy polymer poly(p-hodroxyster ene) are reported. Thermal cross-linking with 4,4'-diisocyanoto-3,3'-d imethoxybiphenyl and the tetraphenylglycidyl ether of p-xylene yields matrices exhibiting T-g values of 245 and 255 degrees C, respectively. Subsequent to corona poling, the cross-linked materials exhibit chi(( 2)) responses of 0.84x10(-7) esu (35pm/V) and 0.85x10(-7) esu (36 pm/V ), respectively, as well as similar-to 90 and similar-to 95% retention of the responses after 900 and 1600h, respectively, in air at 100 deg rees C.