کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5204588 1381965 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Radical processes induced in poly(siloxaneurethaneureas) by ionising radiation
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Radical processes induced in poly(siloxaneurethaneureas) by ionising radiation
چکیده انگلیسی
The effect of ionizing radiation on poly(siloxaneurethaneureas), comprising the soft phase of poly(dimethylsiloxane) chains and hard urethane segments, was examined by electron paramagnetic resonance (EPR) spectroscopy and gas chromatography (GC). It was found that radical processes in the investigated polymers were determined predominantly by polysiloxane segments. Dehydrogenation proceeded mainly in the terminal groups of dimethylsiloxane sequences, forming methylene radicals, whereas abstraction of methyl group dominated in inner fragments of the polysiloxane chain. However, upon irradiation no change in glass transition temperature of polysiloxane segments was detected by DSC.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Degradation and Stability - Volume 91, Issue 9, September 2006, Pages 2182-2188
نویسندگان
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