Utilasation Of A Natural Antioxidant From Elaeis Guineensis (Oil Palm) Leaves In Rubber Compounds
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Date
2015-01
Authors
SHUHAIMI, NOR HASMANIZA HUSNA
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Abstract
Oil palm (Elaeis Guineensis) leaves has the potential as a new type of natural antioxidant (NA) in natural rubber (NR) compound. Characterisation of NA was determined using Fourier Transform Infra-Red (FTIR) spectroscopy analysis. Based on functional groups, it can be shown that extraction from oil palm leaves possesses the criterion as an antioxidant with the present of polyphenolic groups. The curing characteristics, mechanical properties and thermo-oxidative studies on the effectiveness of NA in NR vulcanizate were investigated. Three different stages of investigators were performed. In the first series, the effect of different vulcanization system on NR vulcanizate in the presence of NA was studied. NR vulcanizate were cured with efficient (EV), semi-efficient (SEV) and conventional (CV) system with the presences of NA that was obtained from oil palm leaves. The obtained results have indicated that NA was more significant in SEV system for NR vulcanizate compared to CV and EV systems due to better mechanical properties, moderate crosslink density and curing characteristic results when exposed to aging process. In the second series, the effect of NR origin on NR vulcanizate in the presence of NA was studied. The NR from Malaysia (SMR CV60), Thailand (STR 5L), Vietnam (SVR 3L) and Cambodia (SCR L) were used in this study and cured using SEV. The origin of NR showed comparable curing characteristics and thermo-oxidative properties due to the same NR structure. NA STR 5L possesses higher molecular weight and lower extractable protein content exhibiting higher modulus and fatigue life cycle by inducing more strain crystallization and possesses less protein being denatured in NR vulcanizate. The effect of natural and synthetic rubber
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vulcanizate in the presence of NA was investigated in the third series. The results show that SBR has performed better on aging for retention and compression set testing due to the less reactive double bond to oxygen attacked and it has higher aging temperature as it has better heat stability compared to NR. As a conclusion for effectiveness of NA in rubber compounds, accumulated results from the comparison of NA and TMQ shown that NA vulcanizate has presented comparable results with TMQ in almost all curing characteristics, thermo-oxidative properties, fatigue life cycle and compression set testing for all three series.
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Utilasation Of A Natural Antioxidant From , Elaeis Guineensis (Oil Palm) Leaves In Rubber Compounds