Abstract
Waste cooking oils are problematic disposal especially in the developed countries. In this paper, waste cooking oil is used as raw material to produce foam. The purpose of the study is to develop the high density solid biopolymer (HDB) by using hot compression moulding technique based on flexible and rigid crosslinking agents. Physical properties such as Scanning Electron Microscope (SEM) and density of HDB were examined. The acoustic study of HDB sandwich layups of flexible (F) or rigid (R) has been measured using an impedance tube test according ASTM E1050 standard up to four maximum sandwich lay ups of F and R HDB in different arrangement. It was revealed that the arrangement sandwich layups of FRRF HDB sandwich gives the lowest sound absorption coefficients. The resonance frequency for RFR, FRF and FRRF were shifted to the left except for RFFR. The highest increment was 35.7 %, observed from RFR compared to the three layers of sandwich HDB. For the conclusion, RFR HDB showed that could absorb more sound, thus having higher noise reduction coefficient (NRC) than the other sandwich layups HDB at low frequency.
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