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Mechanism of ultraviolet stabilization of polymers by aromatic salicylates
Author(s) -
Newland G. C.,
Tamblyn J. W.
Publication year - 1964
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/app.1964.070080503
Subject(s) - stabilizer (aeronautics) , compounding , limiting , ultraviolet , chemistry , methyl salicylate , derivative (finance) , volatilisation , polymer , photochemistry , polymer chemistry , organic chemistry , materials science , mechanical engineering , ecology , optoelectronics , financial economics , engineering , economics , composite material , biology
Many derivatives of phenyl salicylate turn yellow when they are exposed, in solution, to ultraviolet light. This limits their usefulness as ultraviolet stabilizers for plastics. Evidence is presented to support the postulation that the yellowing is due to the formation, by a photochemical ortho rearrangement, of a derivative of 2,2′‐dihydroxybenzo‐phenone. Aromatic salicylates, such as 2,6‐dialkylphenyl salicylate, in which the ortho rearrangement is blocked, are found to be nonyellowing stabilizers, although less effective than the better yellowing varieties, such as p ‐octylphenyl salicylate. Loss of stabilizer by volatilization, either in compounding or during subsequent exposure, is shown to be an important factor in limiting the effective performance of the stabilizer.