Three photochromic monomers containing a permanent dipole photochromic azobenzene group spaced from the methacryloyl moiety by a polymethylene segment were synthesized in three steps starting from 4-cyanoaniline. The monomers were homopolymerized and copolymerized with an optically active monomer, (-)-menthyl methacrylate, in the presence of AIBN as a radical initiator. Structurally similar amphiphilic polymers were obtained by homopolymerization of analogous methacrylates in which oligo(oxyethylene) segments replaced the polymethylene spacers. The polymeric materials, having a molar content of photochromic units between 5 and 100% and molecular weights of about 15,000, were characterized by thermal analysis, X-ray diffraction, 1D and 2D NMR. Mobility and photochromic properties in solution were also investigated.
|Autori:||ALTOMARE A; ANDRUZZI L; CIARDELLI F; MADER M; TIRELLI N.; SOLARO R|
|Titolo:||Liquid crystal polymers containing permanent dipole azobenzene chromophores|
|Anno del prodotto:||1999|
|Digital Object Identifier (DOI):||10.1002/masy.19991370105|
|Appare nelle tipologie:||1.1 Articolo in rivista|