Characterizations of Polystyrene-Based Hybrid Particles Containing Hydrophobic Mg(OH)2Powder and Composites Fabricated by Employing Resultant Hybrid Particles

摘要

Polystyrene (PS)-based hybrid particles containing a large amount of Mg(OH)2powder treated with methylhydrogen polysiloxane (MHS) were fabricated by a bulk and subsequent suspension two-step polymerization method. All the particles fabricated showed spherical shape and their particle sizes were about 500 μm, irrespective of the additive amount of the Mg(OH)2powder modified with MHS (ST-1). The actual content of ST-1 powder incorporated insideeach kind of hybrid particle was almost the same as that in the raw mixture, and agglomeration of ST-1 powderwas hardly observed inside the hybrid particles. The compressive strength of the hybrid particles remained almostunchanged, even when the ST-1 powder content increased from 10 to 50 phr. Furthermore, a composite fabricated by employing the hybrid particles achieved homogenous distribution of ST-1 powder and showed a higher oxygen index than that of a composite fabricated by directly mixing of PS pellets and ST-1 powder.