Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
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Preparation of Monodisperse Melamine-Formaldehyde Microspheres via Dispersed Polycondensation

  • Cheong, In-Woo (Nanosphere Process and Technology Laboratory, Department of Chemical Engineering, Yonsei University) ;
  • Shin, Jin-Sup (Nanosphere Process and Technology Laboratory, Department of Chemical Engineering, Yonsei University) ;
  • Kim, Jung-Hyun (Nanosphere Process and Technology Laboratory, Department of Chemical Engineering, Yonsei University) ;
  • Lee, Seung-Jun (Department of Chemical and Bimolecular Engineering, KAIST)
  • Published : 2004.04.01
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Abstract

We have successfully synthesized relatively monodisperse and cross-linked melamine-formaldehyde (M-F) microspheres by dispersed polycondensation and subsequent pH adjustment with serum replacement cleaning. The average particle sizes (equation omitted): weight-average and (equation omitted) : number-average), the polydispersity index (equation omitted), the number of particles N$\_$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 (equation omitted) and N$\_$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 of N$\_$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.

Keywords

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