CHARACTERIZATION OF CARBONACEOUS GEL BEADS PREPARED IN PRESENCE OF POLYMER USING WATER-IN-OIL EMULSION

Carbonaceous gel beads were prepared by addition of polymers using amm onia water of amphiphilic carbonaceous material through water-in-oil e mulsion. By addition of poly(vinylalcohol), carbonaceous gel beads hav ing dimples were obtained, where the number and size of dimples were d ependent on the additive amount and molecular weight of poly(vinylalco hol). However, only beads with smooth surfaces were obtained by additi on of poly(vinylpyrrolidone) and poly(ethyleneglycol). The morphology of beads is significantly influenced by interfacial tension at the wat er-oil interface. The surface area of beads prepared by addition of po lymers remarkably increased by heat treatment from 5 m(2) g(-1) to 289 m(2) g(-1) and a pore size of about 20 Angstrom was predominantly pro duced in the case of PVA. In addition, the carbonaceous gel prepared b y addition of PVA exhibited a high graphitizability, similar to that o f green cokes. Thus, it was found that physicochemical properties of g el beads prepared by addition of PVA are significantly altered.