The role of silica in radiation induced grafting and crosslinking of silica/elastomers blends

被引：10
|
作者：
Dondi, D. [1 ]
Buttafava, A. [1 ]
Zeffiro, A. [1 ]
Conzatti, L. [2 ]
Faucitano, A. [1 ]
机构：
[1] Univ Pavia, Dipartimento Chim, I-27100 Pavia, Italy
[2] CNR, ISMAC, I-16149 Genoa, Italy
来源：
POLYMER | 2012年 / 53卷 / 21期
关键词：
Silica-rubber blends; Radiation grafting; Radiation crosslinking; ELECTRON-SPIN-RESONANCE; ALKYL RADICALS; MOLECULAR-DYNAMICS; SILYL RADICALS; POLYBUTADIENE; RADIOLYSIS; SURFACE; STYRENE; DAMAGE; GEL;
D O I：
10.1016/j.polymer.2012.08.015
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
When silica/polybutadiene and silica/styrene-butadiene are submitted to gamma 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-center dot(CH3)CH(R)(R'). 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. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码：4579 / 4584
页数：6
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