Photodegradation of poly(neopentyl isophthalate) part I: Laboratory and outdoor conditions |
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| Authors: | Przemyslaw Malanowski Saskia Huijser Rolf A.T.M. van Benthem Leendert G.J. van der Ven Jozua Laven Gijsbertus de With |
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| Affiliation: | aLaboratory of Materials and Interface Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600MB Eindhoven, The Netherlands;bLaboratory of Polymer Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600MB Eindhoven, The Netherlands;cDutch Polymer Institute (DPI), P.O. Box 902, 5600 AX Eindhoven, The Netherlands |
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| Abstract: | In this paper the mechanisms of photodegradation of poly(neopentyl isophthalate) (PNI) in laboratory (Suntest XXL+, λ >  300 nm) and outdoor conditions are compared. Changes in the chemical composition were studied with ATR-FTIR, SEC and MALDI-ToF MS. Furthermore, the results were compared with data presented in our previous paper on PNI coatings that were aged in the UVACUBE (λ > 254 nm). Two main aspects of photodegradation of PNI are addressed in the present paper: the influence of different wavelengths and the comparison of laboratory and outdoor exposure regarding the mechanism of degradation. Under short (λ > 254 nm) and long (λ > 300 nm) wavelength irradiation similar products of degradation are formed. However, the presence of short wavelength radiation dramatically accelerates the overall rate of photodegradation of PNI. UV light absorption calculations confirm this experimentally found acceleration. Exposure of PNI in laboratory and outdoor conditions, both with wavelengths λ > 300 nm resulted in similar degradation products in the initial stage of ageing. |
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| Keywords: | Polyester Weathering Coating MALDI UV exposure |
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