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By H. Krug, H. Schmidt (auth.), Prof. Dr. Wolfgang Ehrfeld, Prof. Dr. Gerhard Wegner, Prof. Dr. Wolfgang Karthe, Dr. Hans-Dieter Bauer, Dr. Herbert O. Moser (eds.)
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For a symmetrically poled polymer only two different arrangements result (Fig. e-f), thus only two different angle dependent signals result. Fig. 4 shows the result of a calculation for a partially poled 40jlm thick PVDF film (lOjlm thick polarized region) and a homogeneously poled lOjlm thick PVDF film. The calculations show four different angle dependent second harmonic signals. Thus it should be possible to show asymmetric polarization profiles by nonlinear optical measurements only. r:: VI 20 o ~~~~~--~~~~~~~~~~~--~~~~ -90 -70 -50 Fig.
Due to the low reactivity of the polymer - bound acid chloride groups, the hydroxy groups were converted to the much more reactive alcoholates with butyl lithium prior to the reaction with PMACI. By this method polymethacrylates with a degree of substitution of more than 95 % were obtained under mild conditions (3 hours, room temperature) 38). • m = 2,3,5,6,11 Attempts to prepare the alcoholates of the NLO - active 4 - [ ( 2 - hydroxyethyl) methylamino] - 4' - nitroazobenzene 4a with butyl lithium failed because of side reactions with the polar NLO - chromophore.
Polym. , Polym. Chem. Ed 25, 727 (1987) 37) N. Ogata, K. Sanui, H. Watanabe, I. Yahagi, J. Polym. , Letters Ed. 23, 349 (1985) 38) P. Strohriegl, Mol. Cryst. Liq. Cryst. 183, 261 (1989) 39) St. Polowinski, Acta Polymerica 35, 193 (1984) 40) A. Reiser, ' Photoactive Polymers', J. Wiley and Sons, New York 1989 41) H. MUlier, O. Nuyken, P. Strohriegl, Makromol. , Rapid Commun. 13, 125 (1992) 42) H. MUlier, I. MUlier, O. Nuyken, P. Strohriegl, Makromol. , 1992, in press Polymer Filled Porous Glass Plates - A Composite Material for Nonlinear OptiCS R.