title: Preparation of N2/CO2 triggered reversibly coagulatable and redispersible latexes by emulsion polymerization of styrene with a reactive switchable surfactant.
abstract: This work reports the development of a reversibly coagulatable and redispersible polystyrene latex system that can be triggered by N(2)/CO(2). The coagulatability and redispersibility of the latexes were achieved by employing 0.9-5.6 wt % (N-amidino)dodecyl acrylamide (DAm), a reactive switchable surfactant, in an emulsion polymerization of styrene under CO(2) atmosphere. The resulted latex particles were readily coagulated by N(2) bubbling at 60 °C and redispersed by CO(2) bubbling and ultrasonication, which switched amidine moieties between neutral and ionic states. The coagulation/redispersion processes were repeatable. The prepared latexes showed good stabilities against electrolytes, especially with higher charges.
authors.affiliation: State Key Lab of Chemical Engineering, Institute of Polymerization and Polymer Engineering, Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, People's Republic of China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Zhang
authors.forename: Guoqiang
authors.initials: G
authors.lastname: Yu
authors.forename: Wen-Jun
authors.initials: WJ
authors.lastname: Wang
authors.forename: Haomiao
authors.initials: H
authors.lastname: Yuan
authors.forename: Bo-Geng
authors.initials: BG
authors.lastname: Li
authors.forename: Shiping
authors.initials: S
authors.lastname: Zhu
mesh_terms: D000178:Acrylamides / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry*; D004573:Electrolytes / Q000737:chemistry; D004655:Emulsions; D007840:Latex / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry*; D058105:Polymerization; D020058:Styrene / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*
chemical_list: D000178:Acrylamides; D004573:Electrolytes; D004655:Emulsions; D007840:Latex; D013501:Surface-Active Agents; D002245:Carbon Dioxide; D020058:Styrene; D009584:Nitrogen