title: Well-Defined High Molecular Weight Polystyrene with High Rates and High Livingness Synthesized via Two-Stage RAFT Emulsion Polymerization.
abstract: A highly living polymer with over 100 kg mol(-1) molecular weight is very difficult to achieve by controlled radical polymerization since the unavoidable side reactions of irreversible radical termination and radical chain transfer to monomer reaction become significant. It is reported that over 500 kg mol(-1) polystyrene with high livingness and low dispersity could be synthesized by a facile two-stage reversible addition-fragmentation transfer emulsion polymerization. The monomer conversion reaches 90% within 10 h. High livingness of the product is ascribed to the extremely low initiator concentration and the chain transfer constant for monomer unexpectedly much lower than the well-accepted values in the conventional radical polymerization. The two-stage monomer feeding policy much decreases the dispersity of the product.
authors.affiliation: The State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, 38 Zhe Da Road, Hangzhou, 310027, P. R. China.
authors.forename: Kun
authors.initials: K
authors.lastname: Yan
authors.affiliation: The State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, 38 Zhe Da Road, Hangzhou, 310027, P. R. China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Gao
authors.affiliation: The State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, 38 Zhe Da Road, Hangzhou, 310027, P. R. China.
authors.forename: Yingwu
authors.initials: Y
authors.lastname: Luo
mesh_terms: D004655:Emulsions; D005609:Free Radicals / Q000737:chemistry; D008970:Molecular Weight; D058105:Polymerization; D011137:Polystyrenes / Q000138:chemical synthesis*
chemical_list: D004655:Emulsions; D005609:Free Radicals; D011137:Polystyrenes
keywords: emulsion polymerization; high livingness; high molecular weight; reversible addition fragmentation chain transfer (RAFT) polymerization