Abstract
The natural rubber (NR) was mixed with fluoro elastomer (FKM), due to the difference of polarity in NR and FKM made this blend incompatible so the third component was used. NR/FKM blended with the blend ratio of 70/30 was prepared by using a two-roll mill and vulcanization in a compression mold at 180℃ using peroxide as a curative agent. Epoxidized natural rubber (ENR) or polyisoprene-graft-maleic acid monomethyl ester (PI-ME) was used as a third component. The curing characteristics, morphology, mechanical properties, and automotive fuel swelling were investigated. The results indicated that the scorch time and cure time of the blend rubbers were longer as adding ENR or PI-ME. Both mechanical properties and automotive fuel resistance of the blend rubbers were found to increase with adding ENR in rubber blend. Conversely for adding PI-ME, automotive fuel resistance of the blend rubbers was found to decrease progressively with increasing PI-ME content.
Highlights
Natural rubber (NR) from Hevea brasiliensis is known to have highly unsaturated backbone, and it shows low oil and organic solvent resistance due to nonpolarity [1]
The scorch times of the blends were found to increase by adding Epoxidized natural rubber (ENR) but not significantly change with increasing ENR content
As for scorch time, the cure time value increase by adding ENR and not significantly change with increasing ENR content
Summary
Natural rubber (NR) from Hevea brasiliensis is known to have highly unsaturated backbone, and it shows low oil and organic solvent resistance due to nonpolarity [1]. According to Karnika de Silva and Lewwan [3] the addition of graft copolymer of NR reduced phase sizes attained in NR/NBR blends over a wide range of. Epoxidized natural rubber (ENR) contains polyisoprene as main chain and epoxidize group as side group which should be reacted to NR and FKM molecules, respectively (Figure 1). ENR was interested to be used as a third component for NR/FKM blend. ENR and polyisoprene-graft-maleic acid monomethyl ester (PI-ME) was interested to be used as a third component for these blend. PI-ME contains polyisoprene as main chain and maleic acid monomethyl ester as a grafting group. Mechanical properties, as well as automotive fuel resistances of 70/30 NR/FKM blends with and without a third component, ENR or PI-ME, were investigated. The selected automotive fuels were B5-biodiesel, diesel, gasoline and gasohol
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