The influence of polychromic light on the surface of MDI based polyurethane elastomer

A polyurethane elastomer was synthesized starting from 4,4' diphenylmethane diisocyanate and poly(ethyleneadipate) diol. Butylene glycol was used as chain extender. Surface properties after photo-degradation of the elastomer under the action of the radiation with lambda > 300 nm was monitored by FT-IR spectroscopy and contact angle measurements. The quality of polymer surface was observed under optical microscope. The formation of photo-Fries rearrangement and Norrish II reaction products during irradiation was associated with the gloss loss (from 100% for non-irradiated sample to 27% after 200 h irradiation time) and modification of wettability. There were also found significant modifications with irradiation time of both the glass transition temperature (T(g) decreases from 64 degrees C for non-irradiated sample to 53 degrees C after 200 h irradiation) and the swelling coefficient (an increase from 1.2% up to 2.5% is observed after 200 h irradiation). (C) 2009 Elsevier B.V. All rights reserved.