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Grafting reactions onto polyorganophosphazenes. V. Photostabilization of poly[bis(4‐benzylphenoxy)‐phosphazene] by light‐induced grafting copolymerization of acrylate polymers containing pendant HALS moieties
Author(s) -
Gleria Mario,
Minto Francesco,
Scrima Roberto,
Borzatta Valerio
Publication year - 1996
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19960906)61:10<1675::aid-app7>3.0.co;2-d
Subject(s) - phosphazene , polymer chemistry , copolymer , grafting , benzoin , monomer , photopolymer , photoinitiator , materials science , acrylate , polymer , benzophenone , chemistry , organic chemistry
Abstract The light‐induced grafting reaction of acrylate monomers containing hindered piperidine groups (HALS) onto poly[bis(4‐benzylphenoxy)phosphazene] is described as a function of several different experimental parameters, i.e., type of photoinitiator (benzophenone or benzoin ethyl ether), monomer concentration, solvent composition, light intensity, and swelling of the polyphosphazene films. The obtained phosphazene‐ g ‐HALS‐containing acrylate‐grafted copolymers, irradiated with light of wavelength longer than 300 nm under accelerated photooxidative conditions to test the photostabilizing ability of the grafted HALS groups, showed that the hindered piperidine groups grafted onto the polyphosphazene matrix are able to considerably depress the damage caused to the poly[bis(4‐benzylphenoxy)phosphazene] films during light exposure. The efficiency of this process seems to be related to the amount of HALS residues grafted onto the phosphazene substrates. © 1996 John Wiley & Sons, Inc.