کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
5201196 1381859 2016 7 صفحه PDF سفارش دهید دانلود کنید
عنوان انگلیسی مقاله
Characterization of ozone-degraded composite of crosslinked polydimethylsiloxane with silica in water
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Characterization of ozone-degraded composite of crosslinked polydimethylsiloxane with silica in water
چکیده انگلیسی

Effect of ozone-charged water on degradation of silicone rubber, i.e., crosslinked polydimethylsiloxane/silica composite, was investigated by various analytical techniques, in which active species including active oxygen were generated by self-decomposition of ozone in water. The composite was less swollen with good solvent after degradation with ozone-charged water, whereas amount of extracted polydimethylsiloxane increased significantly, reflecting chain scission of the polymer. Hardness of the composite, measured with scanning probe microscope and hardness tester, was found to increase after degradation. The extracts were proved to be polydimethylsiloxane through FT-IR and GC-MS. The composite was characterized through DD/MAS and CP/MAS solid state NMR spectroscopies on 13C and 29Si nuclei. It was found that OSi(OH)(CH3) groups were made in polydimethylsiloxane due to oxidative reaction with hydroxyl radical and they were attracted to silica in the composite to result in the decrease in the swelling ratio and the increase in the hardness.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Degradation and Stability - Volume 128, June 2016, Pages 193-199
نویسندگان
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