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Synthesis and photobehaviour of hydrophilic acrylic polymers containing azobenzene groups
Author(s) -
Altomare Angelina,
Ciardelli Francesco,
Solaro Roberto,
Tirelli Nicola
Publication year - 1995
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1995.021961013
Subject(s) - comonomer , copolymer , azobenzene , photoisomerization , polymer chemistry , azo compound , side chain , monomer , chemistry , polymer , materials science , isomerization , organic chemistry , catalysis
New hydrophilic photochromic polymeric systems containing side‐chain azobenzene groups were synthesized by radical copolymerization of 4‐acryloyloxyazobenzene with hydrophilic acrylic comonomers containing in the side chain either amide or quaternary onium groups. In all cases copolymerization products characterized by an almost random distribution of monomeric units were obtained. On irradiation at 366 nm, azobenzene‐ containing copolymers underwent trans ‐ to ‐ cis photoisomerization of the side‐chain azo groups and in all cases monoexponential decay of the 320 nm absorbance was observed. Copolymer properties were investigated by DSC analysis, solubility measurements, UV spectroscopy and photoisomerization kinetics. The results obtained are discussed in terms of nature and content of hydrophilic comonomer and water content of the solvent used. The possibility of photomodulating copolymer solubility is also suggested.