Abstract
A poly(ethylene glycol) (PEG) based macroinitiator (MI) with terminal chloride atom at both ends was prepared by the reaction of PEG-400 with chloroacetyl chloride and used for the cationic polymerization of dodecyl vinyl ether (DVE) yielding ABA type block copolymer. The block copolymer was then used as the surfactant for the emulsion polymerization of vinyl acetate and styrene in the presence of potassium persulfate as an initiator. The effects of new polymeric emulsifier on the physicochemical properties of obtained latexes were investigated depending on surfactant percentage in homopolymerizations.
Highlights
Emulsion polymerization is a unique chemical process widely used to produce waterborne latexes with various colloidal and physicochemical properties
A macroinitiator with poly(ethylene oxide) (PEO) like chain was prepared by the reaction of poly(ethylene glycol) (PEG)-400 with chloro acetyl chloride. This initiator was used for cationic polymerization of dodecyl vinyl ether to obtain ABA type block copolymer. This block copolymer was used in the emulsion polymerizations of vinyl acetate (VAc) and styrene (St) as a surfactant, and the effects of this polymeric surfactant quantity were investigated on the main characteristics of poly(vinyl acetate) (PVAc) and polystyrene (PSt) latexes
ABA type tree block copolymer of PEG, PDVE and PEG was prepared by cationic polymerization of dodecyl vinyl ether in the presence of PEG-400 having chlorine groups at both ends as a macroinitiator and a solution of AgBF4 in methylene chloride as catalyst at −7 ̊C for 3 h
Summary
Emulsion polymerization is a unique chemical process widely used to produce waterborne latexes with various colloidal and physicochemical properties. Necessarily less welldefined than small-molecule surfactants, polymeric surfactants probably offer greater opportunities in terms of flexibility, diversity and functionality [8] This is especially true in the light of recent advances in controlled/ living radical polymerization chemistry, as exemplified by atom transfer radical polymerization (ATRP) [9,10,11,12,13,14,15] and, to a lesser extent, reversible addition fragmentation transfer (RAFT) polymerization [16]. With the ABA block copolymer, the PPO B-chain produces small loops at the oil-surface leaving two tails of PEO chains dangling in the aqueous solution. A macroinitiator with PEO like chain was prepared by the reaction of PEG-400 with chloro acetyl chloride This initiator was used for cationic polymerization of dodecyl vinyl ether to obtain ABA type block copolymer. This block copolymer was used in the emulsion polymerizations of vinyl acetate (VAc) and styrene (St) as a surfactant, and the effects of this polymeric surfactant quantity were investigated on the main characteristics of poly(vinyl acetate) (PVAc) and polystyrene (PSt) latexes
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