Diffusion of stabilizers in polymers. III. 2,4‐dihydroxybenzophenone and 2‐hydroxy‐4‐octoxybenzophenone in polyurethanes
- 1 September 1976
- journal article
- research article
- Published by Wiley in Journal of Applied Polymer Science
- Vol. 20 (9) , 2533-2539
- https://doi.org/10.1002/app.1976.070200920
Abstract
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 = D0 exp (−E/RT). The values of D0 and E are discussed in terms of the size of the stabilizer molecular and the structure of the polymer.Keywords
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