Abstract

This study presents long term sorption properties of automobile fluids – premium motor spirit (PMS) and automotive gas oil (AGO) in dynamically vulcanized recycled polyethylene/natural rubber (rPE/NR) thermoplastic elastomer biocomposites. The effect of oil palm empty fruit bunch (OPEFB) filler and maleic anhydride graft polyethylene (MAPE) as compartibilizer on the rPE/NR blends were also studied. The automobile fluids uptake trend was observed to reducewith OPEFB incorporation. Uptake of the automobile fluids by the biocompositesincreased rapidlywithin the first 24 hours and subsequently increased gradually within the 7 days period studied.The analysed results also showed that both the uncompartibilized and compartibilized thermoplastic elastomer biocomposites absorbed more PMS than AGO at same OPEFB loading and immersion time. Diffusion, sorption, and permeation coefficients of both PMS and AGO for the compatibilizedbiocompositesdecreased with increasing OPEFB content. The mode of transport of the automobile fluids into the filled rPE/NR blends has been found to be Fickianwhere the n values ranges from 0.1 to 0.4 for the various systems. This study also revealed greater degree of interaction between the PMS and the biocomposites than the AGO and the biocomposites.

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