Preparation and characterization of thermoplastic starch ...
· Fly ash modified by dry grinding in a planetary ball mill. Ten grams of unmodified fly ash was placed in the grinding jar of a planetary ball mill (Retsch Co., Germany; Model No.: PM 100) with 10 grinding balls. The mill was operated for 1, 3 and 5 h at 400 and 600 rpm. The modified fly ash was dried in a hot air oven and kept in a desicor ...