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Emulsifier‐free emulsion copolymerization of styrene and butyl acrylate with cationic comonomer
Author(s) -
Xu Zushun,
Yi Changfeng,
Cheng Shiyuan,
Zhang Jinzhi
Publication year - 1997
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19971003)66:1<1::aid-app1>3.0.co;2-x
Subject(s) - comonomer , copolymer , emulsion polymerization , polymer chemistry , monomer , butyl acrylate , materials science , styrene , ionic strength , cationic polymerization , acrylate , methacrylate , polymerization , chemical engineering , chemistry , polymer , organic chemistry , aqueous solution , composite material , engineering
Emulsifier‐free emulsion copolymerization of styrene (St) and butyl acrylate (BA) in the presence of a cationic functional comonomer, N ‐dimethyl, N ‐butyl, N ‐ethyl methacrylate ammonium bromine (DBMA) was carried out using azobis(isobutyl‐amidine hydrochloride) (AIBA) as an initiator. The surface properties of particles were studied by testing the actual value ofon the surface of the particles and the surface charge density. The copolymer particles were characterized using transmission electron microscopy (TEM). The effects of reaction temperature, DBMA content, AIBA content, ionic strength, etc., on the conversion of the monomer and the average diameter ( D¯w ) and number ( Np ) of copolymer particles were investigated. Under constant ionic strength, the average diameter of copolymer particles ( D¯w ) decreased with increasing AIBA and DBMA concentrations and decreased with increasing reaction temperature also. Moreover, it increased with increasing St content in the monomer feeding. Under a constant concentration of the co‐monomer and initiator as well as the constant monomer composition, D¯w shows a change process of increase‐decrease‐increase in the ionic strength plot. The polymerization reaction rate increased with increasing the DBMA content, AIBA content, and increasing temperature. The surface charge properties of the particles were mainly decided by the DBMA content, AIBA content, ionic strength, etc. The methods of feeding the monomer affects the morphology, structure, size, and surface charge density of the particles. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 66: 1–9, 1997