Abstract
Glass transition temperature (Tg) of submicron-sized, carboxylated polymer particles dispersed in aqueous media, which were prepared by emulsion copolymerization of styrene, iso-butyl methacrylate, or methyl methacrylate with methacrylic acid, was measured at alkali or acidic pH region with a power compensation-type high sensitive differential scanning calorimeter. The Tg of relatively hydrophilic polymer particles was obviously decreased by the neutralization of the carboxyl groups with KOH, whereas that of hydrophobic polymer particles was not changed though water was absorbed therein. These results indicate that water absorption state, which means not only the amount of water absorption but also the heterogeneity of the ionized carboxylated polymer particles, markedly depends on the hydrophilicity of their base polymers. This strongly supports the formation mechanism of multihollow particles by the stepwise alkali/acid or the alkali/cooling treatments of carboxylated polymer particles proposed by the authors.
References
Warson H, Finch CA (2001) Applications of synthetic resin latices, vol 1. Wiley, New York, p 284
Elaissari A (2003) Colloidal polymers. Marcel Dekker, New York, p 23
Okubo M, Kanaida M, Fujimura M (1990) Chem Express 5:797
Okubo M, Ichikawa K, Fujimura M (1991) Colloid Polym Sci 269:1257
Okubo M, Ichikawa K, Fujimura M (1992) In: Daniels ES, Sudol ED, El-Aasser MS (eds) Polymer Latexes 492:282
Okubo M, Ichikawa K (1994) Colloid Polym Sci 272:933
Okubo M, Ito A, Hashiba A (1996) Colloid Polym Sci 274:428
Okubo M, Sakauchi A, Okada M (2002) Colloid Polym Sci 280:38 (ibid. 2002; 280, 303)
Okubo M, Inoue M, Suzuki T, Kouda M (2004) Colloid Polym Sci 282:1150
Brandrup J, Immergut EH, Grulke EA, Bloch D (eds) (1999) Polymer Handbook, 4th edn.
Author information
Authors and Affiliations
Corresponding author
Additional information
Part CCLXIX of the series, “Studies on Suspension and Emulsion.”
Rights and permissions
About this article
Cite this article
Suzuki, T., Inoue, M. & Okubo, M. Estimation of water absorption state within ionized carboxylated polymer particles with high sensitive differential scanning calorimetry. Colloid Polym Sci 284, 802–806 (2006). https://doi.org/10.1007/s00396-005-1445-8
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00396-005-1445-8