Portal de Periódicos da CAPES

Gradient Density Grafted Polymers on Ground Tire Rubber Particles by Atom Transfer Radical Polymerization

2006; Wiley; Volume: 207; Issue: 24 Linguagem: Inglês

10.1002/macp.200600376

1521-3935

Serena Coiai, Elisa Passaglia, Francesco Ciardelli,

Fuel Cells and Related Materials

Abstract Summary: The graft polymerization of styrene and (meth)acrylic monomers via ATRP from cross‐linked rubber particles, produced by recycled tires (“ground tire rubber”, GTR), is reported. GTR particles, obtained by cryogenic grinding process, still contain CC unsaturations on the surface, which were first oxidized to hydroxyl groups and then modified by reaction with 2‐bromoisobutyryl bromide to serve as ATRP macroinitiators. Graft polymerizations were carried out using CuBr/CuBr 2 / N , N , N ′, N ″, N ″‐pentamethyldiethylenetriamine as catalytic system in bulk or in anisole at high temperature. The grafted particles were analyzed by ATR‐IR (spectra were recorded on particles surface and cross‐sectional slices), TGA, SEM and X‐ray microanalysis. Arrangement of surface‐grafted polymer assemblies along the particles section. magnified image Arrangement of surface‐grafted polymer assemblies along the particles section.