Abstract
A new functionalized polyurethane structure with a thiophene ring having a tricyanovinyl group in the polymer side chain was synthesized. The molecular weight of the final polymer was determined to be Mn=12000 and Mw/Mn=2.04. The resulting polymer was soluble in N-methylpyrrolidinone and could be processed into good optical quality films by spin casting at ca. 100°C. It showed no weight loss up to 266°C in the thermogravimetric analysis and a definite glass transition at 176°C. The second-order nonlinear optical coefficient, d33, was determined to be 51 pm V-1 from measuring the second harmonic generation (SHG) for a thin polymer film after poling treatment. The outstanding orientational stability of the aligned chromophores was observed up to about 150°C, which originated from the rigid polymer backbone and the stabilizing function of the hydrogen bridges formed between the neighboring polyurethane chains.
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