title: Ultrasonically initiated emulsion polymerization of styrene in the presence of Fe2+.
abstract: Ultrasonically initiated emulsion polymerization of styrene was carried out in the presence of Fe(2+). The addition of a small amount of Fe(2+) markedly enhanced the polymerization rate of styrene. In the presence of 50 microM Fe(2+), the conversion of monomer in the reaction time of 60 min was 2.4 times as high as that in the absence of Fe(2+). The increase in the polymerization rate was due to higher concentration of hydroxyl (*OH) radicals generated via Fenton reaction of Fe(2+) with hydrogen peroxide (H(2)O(2)), which was proved by a lower amount of H(2)O(2) in Fe(2+) aqueous solution compared with that in pure water during ultrasonic irradiation. However, the addition of excessive Fe(2+) had no further accelerating effect on the polymerization rate due to the reduction of *OH radicals by Fe(2+). So it is an effective way to add an appropriate amount of Fe(2+) to accelerate ultrasonically initiated emulsion polymerization of styrene.
authors.affiliation: State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu 610065, China.
authors.forename: Guihua
authors.initials: G
authors.lastname: Qiu
authors.affiliation: State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu 610065, China.
authors.forename: Min
authors.initials: M
authors.lastname: Nie
authors.affiliation: State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu 610065, China. Electronic address: qiwang@scu.edu.cn.
authors.forename: Qi
authors.initials: Q
authors.lastname: Wang
mesh_terms: D000465:Algorithms; D002384:Catalysis; D004655:Emulsions; D006861:Hydrogen Peroxide / Q000737:chemistry / Q000528:radiation effects; D017665:Hydroxyl Radical; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D016877:Oxidants / Q000737:chemistry / Q000528:radiation effects; D011137:Polystyrenes / Q000138:chemical synthesis*; D014465:Ultrasonics
chemical_list: D004655:Emulsions; D016877:Oxidants; D011137:Polystyrenes; D017665:Hydroxyl Radical; D006861:Hydrogen Peroxide; D007501:Iron