A core-shell particle for use as filler in rubber compositions. In one embodiment, the particle comprises a crosslinked core having repeat aromatic vinyl units. During an emulsion polymerization, a crosslinked shell comprising of conjugated diene units is grafted onto the core through residual vinyl units. The polymeric shell provides for better interaction and dispersion of the styrene core in an otherwise immiscible polymer matrix, particularly diene-based polymers. In another embodiment, the core has repeat units of (i) about 0% to about 25% by weight of a conjugated diene unit, (ii) about 70% to about 85% by weight of an aromatic vinyl unit, and (iii) about 15% to about 30% by weight of a crosslinking monomer unit.
一种芯壳粒子,可用作橡胶组合物中的填料。在一个实施方案中,颗粒包括一个具有重复芳香族
乙烯基单元的交联芯。在乳液聚合过程中,由共轭二烯单元组成的交联壳通过残余
乙烯基单元接枝到芯上。这种聚合物外壳可使
苯乙烯芯材在原本不相溶的聚合物基体(尤其是二烯基聚合物)中更好地相互作用和分散。在另一个实施方案中,芯材具有以下重复单元:(i) 约 0% 至约 25% (按重量计)共轭二烯单元;(ii) 约 70% 至约 85% (按重量计)芳香
乙烯基单元;(iii) 约 15% 至约 30% (按重量计)交联单体单元。