High Tg NLO-polymers by functionalization of reactive precursors

Michael Doerr; Rudolf Zentel; Peter Boldt; Juergen Wichern; Manfred Eich; Martin Sprave; Jan Vydra

doi:10.1117/12.222781

5 October 1995 High Tg NLO-polymers by functionalization of reactive precursors

Michael Doerr, Rudolf Zentel, Peter Boldt, Juergen Wichern, Manfred Eich, Martin Sprave, Jan Vydra

Proceedings Volume 2527, Nonlinear Optical Properties of Organic Materials VIII; (1995) https://doi.org/10.1117/12.222781
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

A new copolymer system with high, but still variable glass-transition temperatures was synthesized. The fixation of various NLO-chromophores is performed after the radical is performed after the radical copolymerization by a polymer analogous reaction. This was accomplished by copolymerizing various N-substituted maleimides with methylvinyl- or vinylisocyanate, so that a polymer with a 1:1 composition of the two monomers and reactive isocynate side-groups is obtained. With different substituents attached to the imide-ring, T_g can be adjusted between 100 and 200 degrees C. Two effects of the substituent at the imide-nitrogen are observed. Bulky gorups reduce the mobility of the chain and lead to high T_g values. A similar tendency is found for smaller less flexible substituents. In this case the intermolecular forces by hydrogen-bonding (urethanes) contibute ot the effects for high T_g's. A variety of different NLO-chromopores can be fixed on the polymer backbone by reaction of a hydroxyalkyl-spacer with the isocyanates, so that a urethane linkage between the chromophore and the polymer is formed. Based on the experience obtained with this first class of NLO-materials, new functionalized polymers were prepared. In order to further increase the T_g-values, while keeping a good processability (solubility), chemical modifications of the spin-coated polymer were prepared. In order to further increase the T_g-values, while keeping a good processablility (solubility), chemical modifications of the spin-coated polymer were performed. Monomers functionalized with tertiary butyl groups (esters or carbonates) allow it, to split off isobutene from the final (and processed) polymer, thereby reducing its solubility and increasing its T_g-value.

Citation Download Citation

Michael Doerr, Rudolf Zentel, Peter Boldt, Juergen Wichern, Manfred Eich, Martin Sprave, and Jan Vydra "High Tg NLO-polymers by functionalization of reactive precursors", Proc. SPIE 2527, Nonlinear Optical Properties of Organic Materials VIII, (5 October 1995); https://doi.org/10.1117/12.222781

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