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Modification of Cross-Linked Rubber Particles by Free Radical Polymerization |
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| Authors: | Serena Coiai Elisa Passaglia Francesco Ciardelli Diego Tirelli Franco Peruzzotti Emiliano Resmini |
| Institution: | 1. CNR-ICCOM c/o Department of Chemistry and Industrial Chemistry, University of Pisa, Via Risorgimento 35, 56126 Pisa, Italy;2. CNR-ICCOM c/o Department of Chemistry and Industrial Chemistry, University of Pisa, Via Risorgimento 35, 56126 Pisa, Italy
Department of Chemistry and Industrial Chemistry, University of Pisa, Via Risorgimento 35, 56126 Pisa, Italy;3. PIRELLI Labs, Viale Sarca 222, 20126 Milano, Italy |
| Abstract: | The synthesis of polystyrene chains covalently bound to the surface of cross-linked rubber particles from recycled tires (ground tire rubber, GTR) was investigated via free radical polymerization in situ by using azobisisobutyronitrile (AIBN) and dibenzoyl peroxide (BPO) as initiators. Indeed, the graft polymerization provides a significant route to modify the physical and chemical properties of these particles allowing to improve their compatibility with other polymers. Polymerization reactions were carried out in bulk by changing the styrene/GTR ratio as well as the amount of free radical initiator. Appreciable amounts of polystyrene (PS) were grafted on GTR when BPO was used as confirmed by particle characterizations. |
| Keywords: | cross-linked rubber particles graft polymerization polystyrene |