Abstract
The purpose of this study is to improve the several properties of composites consisting of a phenolic, fly ash, and sodium or calcium type artificial Zeolite (Na-Ze or Ca-Ze). And it also includes the improvement in the flowability of molding compounds. The molding compounds were prepared from a phenol novolac, a curing agent, and several fillers. The flowability of the compounds containing fly ash and artificial Zeolite as a filler, mentioned above, was superior to that of the compounds containing glass fiber (GF), calcium carbonate (CaCO3), or talc as a filler. The phenolic composites were prepared from the above molding compounds by transfer molding. The phenolic composite containing Ca-Ze had most superior heat resistance, electrical insulation, and flexural strength, though in the lastly listed property it ranked next to the GF-filled composite. The linear expansion coefficient of the composite containing Ca-Ze was as low as almost isotropic. The reasons of obtaining these excellent properties were thought to be as follows : 1) Ca-Ze could finely be dispersed in the phenolic resin to bring good impregnation. 2) The surface chemical and physical interaction between the resin and Ca-Ze was higher than that between the resin and the other fillers.
