Abstract
Side-chain polymer containing the carbazolyldinitrophenylhydrazone moiety was synthesized for nonlinear optical (NLO) applications. Because free radical polymerization resulted in molecular weight limitation due to the chain transfer nature of the NLO active chromophore, to prepare a high molecular weight polymer, a polymer reaction was chosen to functionalize a preformed aldehyde prepolymer. This prepolymer (P1) was synthesized by the reaction of 6-(3-formyl-carbazol-9-yl)-hexyl methacrylate (M1) with methyl methacrylate (MMA). Successful polymerization was confirmed by 1H and 13C NMR spectroscopy and the molecular weight of the polymer was determined by gel permeation chromatography analysis. Polymer reaction of P1 with 2,4-dinitrophenyl hydrazine was carried out to prepare the NLO polymer (P2) and the reaction was monitored by NMR spectroscopy. This NLO polymer was soluble in common solvent and high optical quality thin film could be easily prepared for NLO activity measurement. The electro-optic coefficient (r33) of the polymer was determined 1.4 pm V−1 at poling field of 80 V μm−1.
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