Abstract
We have successfully synthesized relatively monodisperse and cross-linked melamine-formaldehyde (MF) microspheres by dispersed polycondensation and subsequent pH adjustment with serum replacement cleaning. The average particle sizes (\(\overline {D_w }\): weight-average and\(\overline {D_n }\): number-average), the polydispersity index (\(\overline {D_w } /\overline {D_n }\)), the number of particlesN p , and the gel content of the M-F microspheres were observed by varying the pH, the surfactant concentration, and the polymerization temperature. We observed that both the pH and the polymerization temperature were predominant factors in determining\(\overline {D_n }\) andN p , but the effect that the temperature and pH had on the gel content (> 94% for all samples) was negligible. The exponents of the slopes of plots ofN p versus pH and surfactant concentration were −10 and 0.6, respectively. Particle nucleation and growth were achieved within short periods; the incessant coagulation occurred even in the presence of surfactants.
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Cheong, I.W., Shin, J.S., Kim, J.H. et al. Preparation of monodisperse melamine-formaldehyde microspheres via dispersed polycondensation. Macromol. Res. 12, 225–232 (2004). https://doi.org/10.1007/BF03218392
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DOI: https://doi.org/10.1007/BF03218392