Characterization of carboxylated poly(butyl acrylate) latices produced by a semibatch process

✍ Scribed by C. S. Chern; F. Y. Lin; Y. C. Chen; C. H. Lin

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 779 KB
• Volume: 62
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19961017)62:3<585::aid-app16>3.0.co;2-y

✦ Synopsis

Several carboxylated poly(buty1 acrylate) latices prepared by a semibatch emulsion polymerization process were characterized in this study. A significant amount of polyelectrolyte was found in the latex product containing 10% AA, designated as AA10. On the other hand, latices containingO.l% AA (AAO.l), 0.1% MAA (MAAO.l), and 10% MAA (MAA10) showed very low levels of polyelectrolyte in water. Based on the critical flocculation concentration data, it can be concluded that incorporation of 10% AA or 10% MAA into the emulsion polymers can greatly improve the chemical stability of the latex products, especially at higher pH. T h e data of the p H and conductometric titration experiments show that the MAA unit can be distributed more uniformly in the latex particles in comparison with the AA unit. This result is further confirmed by determination of the T,'s of the emulsion polymers by means of thermally stimulated current (TSC). 0