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The influence of polyvinyl acetate and rice starch binders on molded rice straw filled rice bran: comparative study

The main objective of this study is to evaluate the effect of rice starch and polyvinyl acetate (PVAc) as binding agents on mechanical, thermal and water absorption properties of molded rice bran/rice straw (RB/RS). Rice bran (RB) and rice straw (RS) were molded in form of paper sheet using compression-molding technique. Tearing resistance of RB/RS was enhanced by 135%–140% after the addition of PVA and rice starch binders. Thermal stability of RB/RS was affected positively by PVAc and negatively by rice starch binders. Fractured surface analysis of inverted optical microscope indicated that RB/RS samples have clear visible phase separation without binding agent compared to RB/RS with binders of PVAc and rice starch.