کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
27711 44039 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Photochemical behaviour of poly(ethylene oxide) (PEO) in aqueous solution: Influence of iron salts
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
Photochemical behaviour of poly(ethylene oxide) (PEO) in aqueous solution: Influence of iron salts
چکیده انگلیسی

The degradation of poly(ethylene oxide) (PEO) photoinduced (λ ≥ 300 nm) by Fe(III) (6.0 × 10−4 mol L−1) in aqueous solution in the presence of oxygen at 15 °C has been investigated in various experimental conditions of pH and concentrations: pH 3.1 and 7.8 and at three different concentrations of PEO: 0.1, 5.0 and 50.0 g L−1. The formation of oxidation products was followed by infrared analysis of deposit obtained by evaporation of aliquots of irradiated polymer solutions. The photooxidation of PEO aqueous solutions both in the presence and in the absence of Fe(III) leads to the formation of macromolecular formates and esters. Formate ions are formed by the hydrolysis of macromolecular formates leading to the acidification of the medium. The presence of Fe(III) modifies the rate of oxidation especially in weakly acidic medium. The photogenerated OH radicals from iron species accelerate the oxidation of PEO. Thermooxidation experiments of PEO in aqueous solution in the presence of Fe(III) at 50 °C are also reported and compared with photooxidation results.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 195, Issues 2–3, 15 April 2008, Pages 167–174
نویسندگان
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