Presented at the International Symposium on Polymeric Microspheres, Fukui, 23–26 October 1991.
Effect of crosslinked core on minimum film formation temperature and morphology of composite microspheres†
Article first published online: 10 SEP 2007
Copyright © 1993 Society of Chemical Industry
Volume 30, Issue 4, pages 499–504, 1993
How to Cite
Omi, S., Kohmoto, T. and Iso, M. (1993), Effect of crosslinked core on minimum film formation temperature and morphology of composite microspheres. Polym. Int., 30: 499–504. doi: 10.1002/pi.4990300413
- Issue published online: 10 SEP 2007
- Article first published online: 10 SEP 2007
- Manuscript Accepted: 25 MAY 1992
- Manuscript Revised: 6 MAY 1992
- Manuscript Received: 12 MAR 1992
- seed emulsion polymerization;
Effect of crosslinking on minimum film formation temperature (MFT) and particle morphology was investigated using the latices composed by the combination of crosslinked soft core-hard shell. n-Butyl acrylate (nBA) and ethylene glycol dimethacrylate (EGDMA) were used to prepare crosslinked rubber with methylmethacrylate (MMA) or styrene (ST) as a hard plastic component. Ordinary batch (flooded with secondary monomer) and semicontinuous (starved feed) operations were employed to compare the thermal properties of composite latices resulting from the different mode of secondary polymerization. As the degree of crosslinking increases, MFT of the latices obtained by batch operation became higher than those by semibatch operation. Observation of microtomed sections of particles stained with RuO4 did not reveal much difference in particle morphologies between the two operations. There was a definite relationship between MFT and molecular weight of THF soluble fraction of composite polymers regardless the mode of operation.