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15 January 1990 Recent Advances In The Synthesis And Characterization Of New Nonlinear Optical Polymers
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Electron nuclear double resonance studies and theoretical calculations suggest that self-localization occurs in coupled π-electron systems. Since intrinsic (electron-phonon and electron coulombic) interactions determine the extent of electron delocalization (hence derivative properties such as optical nonlinearity), it is not necessary to synthesize polymers possessing long segments of uninterrupted π conjugation. Thus, we have investigated the synthesis of copolymers containing alternating saturated and unsaturated segments. The number of advantages realized with this approach include improved solubility (which translates into improved processibility), higher polymer molecular weights (which translates into films of improved mechanical strength) for polycondensation synthetic procedures and sharper bandedges (bandedge tailing due to a distribution of short polymer lengths is avoided). This last feature results in better discrimination of resonant and non-resonant contributions to third order susceptibility. Finally, we discuss the extension of our development program for nonlinear optical materials to the preparation of organometallic as well as organic materials and the extension to the preparation of composite materials as well as homo and copolymer systems.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
L. P. Yu, R. Vac, L. R Dalton, and R. W. Hellwarth "Recent Advances In The Synthesis And Characterization Of New Nonlinear Optical Polymers", Proc. SPIE 1147, Nonlinear Optical Properties of Organic Materials II, (15 January 1990);

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