1995 年 32 巻 4 号 p. 229-236
Composite particles constituted of fine AlN powder and polystyrene as the base polymer were prepared by suspension polymerization. To change the viscosity of the dispersed phase at the beginning of suspension polymerization, preliminary bulk polymerization of styrene containing AlN powder was carried out prior to suspension polymerization. Interfacial polycondensation was also carried out to form the polyamide film on the surface of the dispersed phase droplet. The AlN content of the composite particles increased with increase in the viscosity of the dispersed phase due to preliminary bulk polymerization and with decrease in the impeller speed during suspension polymerization. Formation of the polyamide film was found to effectively prevent AlN powder from escaping to the continuous phase, and this led to the increase in the AlN content. The dispersion state of AlN powder in the base polymer was found to be controlled by the preparation conditions.