Rice Husk Ash as Filler in Unsaturated Polyester Based Sheet Moulding Compounds (SMC)

摘要

Sheet moulding compounds were made from unsaturated polyester resin as matrix material filled with calcium carbonate,white rice hush ash and black rice husk ash.The.objective of this investigation was to utilize the white,and black rice husk ash,which are available,in large quantities and which pose environmental pro-blems in rice-producing areas.The investigation showed that black ash has a profound effect to increase the modulus of rupture,modulus of elasticity,as well as to reduce the thickness swelling and water absorption.Scanning electron microscopic studies showed that the black ash retained the fibrous morphology and thus has a better reinforcing function than white ash,which is amorphous.Reduction in water absorption and thickness smelling should he attributed to the hydro-phobic nature of carbonaceous residues present on the outer surface of blach ash.Formation of organosilicon compounds during the processing of the black ash was at first suspected to be responsible,for the water repellency;but the ~(29)Si MAS NMR studies did not provide evidence for the formation of such compounds.