کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5366260 | 1388346 | 2009 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The influence of polychromic light on the surface of MDI based polyurethane elastomer The influence of polychromic light on the surface of MDI based polyurethane elastomer](/preview/png/5366260.png)
A polyurethane elastomer was synthesized starting from 4,4Ⲡdiphenylmethane 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 λ > 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 (Tg decreases from 64 °C for non-irradiated sample to 53 °C after 200 h irradiation) and the swelling coefficient (an increase from 1.2% up to 2.5% is observed after 200 h irradiation).
Journal: Applied Surface Science - Volume 255, Issue 23, 15 September 2009, Pages 9453-9457