Abstract
The purpose of this research is to prepare anti-gnawing bio-polymer composites and to investigate morphology, thermal and rheological properties. The non-lethal substances of denatonium benzoate (DB) mixed with zinc stearate (ZnSt) and capsicum oleoresin (CO) impregnated in silica (SiCO) were mixed with polybutylene succinate (PBS). DB gives the bitter taste and CO provides burning sensation to the rats. The concentration of DB/ZnSt is 2 wt% and concentration of SiCO is ranging from 12 to 24 wt%. The influence of the substances and concentration is analyzed by the analysis of variance (ANOVA) method. The substances and concentration are most significant with P-values less than 0.05. The specimens were examined gnawing test for 3 months. The best rat-proof sample is 12S, consisting of SiCO 12 wt%. SiCO presents better rat-proof property than DB. The incorporation of DB/ZnSt reduced rheological properties and thermal stability. The increase in SiCO concentration in PBS improved rheological properties and thermal properties. The PBS composites are good rat-preventing plastics.
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