Styrene-butyl acrylate-N,N-dimethylN-butylN-methacrylamidino propyl ammonium bromide emulsifier-free emulsion copolymerization
✍ Scribed by Xu, Zushun; Yi, Changfeng; Lu, Guohong; Zhang, Jinzhi; Cheng, Shiyuan
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 342 KB
- Volume
- 44
- Category
- Article
- ISSN
- 0959-8103
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✦ Synopsis
EmulsiÐer-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 NH 2 `z { wNw and wC = } … NH 2
on the surface of particles and the surface charge density. The copolymer particles were characterized by transmission electron microscopy (TEM). The e †ects of reaction temperature, DBMPAB content, AIBA content, and ionic strength on conversion of monomer, average diameter and number of copolymer D1 w ) ( N p ) particles were investigated. Under constant ionic strength the average diameter of copolymer particles decreased with increasing AIBA and DBMPAB con-(D1 w ) centration, and decreased with rising reaction temperature. At constant concentration of comonomer and initiator and constant monomer composition, D1 w showed an increaseÈdecreaseÈincrease 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.