Synthesis, chiroptical properties and photoinduced linear birefringence of the homopolymer of (R)-3-methacryloyloxy-1-(4′-cyano-4-azobenzene)pyrrolidine and of the copolymers with the enantiomeric monomer |
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Authors: | Luigi Angiolini Tiziana Benelli Elisabetta Salatelli Alessandro Daurù |
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Institution: | a Dipartimento di Chimica Industriale e dei Materiali and INSTM UdR-Bologna, Università di Bologna, Viale Risorgimento 4, 40136 Bologna, Italy b Dipartimento di Scienze Chimiche and INSTM UdR-Padova, Università di Padova, Via Marzolo 1, 35131 Padova, Italy |
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Abstract: | We have investigated a new optically active photochromic homopolymer poly(R)-3-methacryloyloxy-1-(4′-cyano-4-azobenzene)pyrrolidine] containing in the side-chain a chiral group of one prevailing configuration linked to a trans-azoaromatic system. As expected it exhibits in solution homogeneous conformations with a prevailing chirality induced by dipole-dipole interactions between side-chain chromophores. Copolymers with the enantiomeric monomer (S)-3-methacryloyloxy-1-(4′-cyano-4-azobenzene)pyrrolidine have also been prepared in order to evaluate the effect on the photoinduced optical properties of side-chain chiral groups of opposite configuration in various ratios. The possibility of producing reversible photomodulation of linear birefringence without any significant degradation of these materials seems to be promising for their use in optical data storage. |
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Keywords: | Photochromic chiral polymers Optical activity Circular dichroism Azo polymers Optical storage |
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