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Diffusion of stabilizers in polymers. III. 2,4‐dihydroxybenzophenone and 2‐hydroxy‐4‐octoxybenzophenone in polyurethanes
Author(s) -
Hauserman R. G.,
Johnson M.
Publication year - 1976
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.1976.070200920
Subject(s) - polyester , polyurethane , diffusion , polymer , polymer chemistry , stabilizer (aeronautics) , arrhenius equation , materials science , atmospheric temperature range , chemistry , composite material , activation energy , organic chemistry , thermodynamics , mechanical engineering , physics , engineering
The diffusion of the radioactively labeled ultraviolet stabilizers 2,4‐dihydroxybenzophenone and 2‐hydroxy‐4‐octoxybenzophenone in two linear poly(ester‐urethanes) was studied over the temperature range 36–75°C. Within this temperature range, both stabilizers diffused faster in the polyurethane which had a polyester of molecular weight 2000 in its chain rather than in the polyurethane with a polyester of molecular weight 1000 in its chain. 2,4‐Dihydroxybenzophenone diffused slightly faster than 2‐hydroxy‐4‐octoxybenzophenone in both polyurethanes. In each case, the results can be represented by an Arrhenius expression D = D 0 exp (− E / RT ). The values of D 0 and E are discussed in terms of the size of the stabilizer molecular and the structure of the polymer.