Premium
Styrene–butyl acrylate– N,N ‐dimethyl N ‐butyl N ‐methacrylamidino propyl ammonium bromide emulsifier–free emulsion copolymerization
Author(s) -
Xu Zushun,
Yi Changfeng,
Lu Guohong,
Zhang Jinzhi,
Cheng Shiyuan
Publication year - 1997
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199710)44:2<149::aid-pi836>3.0.co;2-u
Subject(s) - comonomer , copolymer , emulsion polymerization , polymer chemistry , butyl acrylate , monomer , materials science , styrene , ionic strength , cationic polymerization , acrylate , ammonium bromide , chemical engineering , chemistry , organic chemistry , polymer , composite material , aqueous solution , pulmonary surfactant , engineering
Emulsifier‐free emulsion copolymerization of styrene (St) and butyl acrylate (BA) in the presence of cationic functional comonomer N,N ‐dimethyl N ‐butyl N ‐methacrylamidino propyl ammonium bromide (DBMPAB) was carried out using azobis(isobutylamidine hydrochloride) (AIBA) as initiator. The surface properties of particles were studied by testing the actual value of ‐N + and ‐C + (NH 2 ) 2 (Publisher's note: for graphical representations please see printed journal or the Acrobat PDF version on this website.) on the surface of particles and the surface charge density. The copolymer particles were characterized by transmission electron microscopy (TEM). The effects of reaction temperature, DBMPAB content, AIBA content, and ionic strength on conversion of monomer, average diameter D w ) and number ( N p ) of copolymer particles were investigated. Under constant ionic strength the average diameter of copolymer particles ( D w ) decreased with increasing AIBA and DBMPAB concentration, and decreased with rising reaction temperature. At constant concentration of comonomer and initiator and constant monomer composition, D w showed an increase–decrease–increase with ionic strength plot. The polymerization rate increased with increasing DBMPAB content, AIBA content and rising temperature. The surface charge properties of particles were mainly decided by DBMPAB content, AIBA content, and ionic strength. ©1997 SCI