The role of silica in radiation induced grafting and crosslinking of silica/elastomers blends
作者： D. Dondi , A. Buttafava , A. Zeffiro , L. Conzatti , A. Faucitano
DOI: 10.1016/J.POLYMER.2012.08.015
关键词: Hydrophobic silica 、 Radical 、 Grafting 、 Materials science 、 Absorption (chemistry) 、 Polybutadiene 、 Polymer chemistry 、 Radiolysis 、 Elastomer 、 Polymer
摘要: Abstract 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 surface with concomitant grafting crosslinking polymers. Key intermediate in such reactions SiO2-bonded radicals structure SiO2–C•(CH3)CH(R)(R′). The role is rationalized terms following steps: a) absorption radiation energy bulk particles followed exciton migration surface; b) excited groups (silanols) giving radicals; c) polymers initiated grafted radicals.
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