SURFACE FUNCTIONALIZATION OF POLYMER LATEX-PARTICLES - III - A CONVENIENT METHOD OF PRODUCING ULTRAFINE POLY(METHYLSTYRENE) LATEXES WITH ALDEHYDE GROUPS ON THE SURFACE
P. Li et al., SURFACE FUNCTIONALIZATION OF POLYMER LATEX-PARTICLES - III - A CONVENIENT METHOD OF PRODUCING ULTRAFINE POLY(METHYLSTYRENE) LATEXES WITH ALDEHYDE GROUPS ON THE SURFACE, Journal of polymer science. Part A, Polymer chemistry, 36(12), 1998, pp. 2103-2109
A convenient method of preparing ultrafine poly(methylstyrene) (PMS) l
atex particles with aldehyde groups on the surface is developed. PMS l
atexes in the size range 33-81 nm were prepared via microemulsion poly
merization, using cetyltrimethylammonium bromide (CTAB) as surfactant.
The surface of the PMS latexes was oxidized in the presence of tert-b
utyl hydroperoxide catalyzed by copper(II) chloride. As the degree of
oxidation increased up to 6 h, the amounts of aldehyde group increased
. Bigger particles were found to have a slightly higher rate of oxidat
ion than small ones under the same oxidation conditions. The particle
size underwent little change during oxidation; thus, the amounts of fu
nctional groups and the particle size could be controlled concurrently
. Dialysis study of the oxidized PMS microlatexes indicated that the i
nstability of highly oxidized PMS microlatexes was caused by the reduc
tion of total surface charge density due to the presence of carboxylic
acid groups. (C) 1998 John Wiley & Sons, Inc.