کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5182784 | 1380999 | 2012 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The role of silica in radiation induced grafting and crosslinking of silica/elastomers blends
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
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چکیده انگلیسی
When silica/polybutadiene and silica/styrene-butadiene are submitted to γ irradiation at 77 K a scavenging of the silica radiolytic species by absorbed vinyl units takes place at the surface with concomitant grafting and crosslinking of the polymers. Key intermediate in such reactions are SiO2-bonded radicals of structure SiO2-C
- (CH3)CH(R)(Râ²). The role of silica is rationalized in terms of the following steps: a) absorption of the radiation energy in the bulk of the silica particles followed by exciton migration at the surface; b) reactions of excited groups (silanols) with absorbed vinyl units giving SiO2-bonded radicals; c) crosslinking of the polymers initiated by grafted radicals.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 53, Issue 21, 28 September 2012, Pages 4579-4584
Journal: Polymer - Volume 53, Issue 21, 28 September 2012, Pages 4579-4584
نویسندگان
D. Dondi, A. Buttafava, A. Zeffiro, L. Conzatti, A. Faucitano,