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Alkaline treatment of the black rice husk ash (BRHA) was done by immersing BRHA in 8 % sodium hydroxide, NaOH, solution for 24 hours and then the treated BRHA (TBRHA) was neutralized, washed and dried in an oven. The TBRHA was subsequently compounded with the polypropylene (PP) by using single screw extruder machine, and followed by compression molding at 185 °C. The physical properties results showed that the density and the water absorption behavior of the TBRHA filled PP biocomposite (TBRHA-PP) are higher and lower, respectively, when compared with the untreated BRHA filled PP biocomposites (UBRHA-PP). The melt flow index value of the TBRHA-PP biocomposite is also higher in comparison with the UBRHA-PP biocomposites. The mechanical properties results exhibited that the tensile stress, tensile strain, flexural modulus and impact strength of the TBRHA-PP biocomposite are higher than of the UBRHA-PP biocomposites. However, the tensile modulus of the TBRHA-PP biocomposite is slightly lower as compared with the UBRHA-PP biocomposites. Therefore, it could be concluded that the alkaline treatment of the BRHA has improved some of the physico-mechanical properties of the BRHA filled PP biocomposites.

Effect of alkaline treatment on physico-mechanical properties of black rice husk ash filled polypropylene biocomposites