کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5203772 1381939 2009 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Photodegradation of poly(neopentyl isophthalate) part I: Laboratory and outdoor conditions
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Photodegradation of poly(neopentyl isophthalate) part I: Laboratory and outdoor conditions
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Degradation and Stability - Volume 94, Issue 11, November 2009, Pages 2086-2094
نویسندگان
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