Kenaf fiber-filled natural rubber composites with and without Bis-(3-triethoxysilylpropyl) tetrasulphide as a coupling agent at different kenaf loading i.e., 0, 10, 20, 30 and 40 phr were prepared. The natural rubber composites were cured at 150 C according to their cure time. Curing characteristics, tensile properties, rubberfiller interaction and morphological properties of the kenaf fiberfilled natural rubber composites were studied. Scorch time and cure time decreased but tensile strength, elongation at break and tensile modulus increased with the presence of Si-69 in the composites. Rubber-filler interaction studies showed that the NR-kenaf interaction was better for NR composites with Si-69.
Mangosteen peel powder (MPP) was used as an antioxidant in natural rubber (standard Malaysian rubber [SMR] L). Natural rubber compounds with various types of antioxidants (i.e., MPP; N-isopropyl-N'-phenyl-P-phenylenediamine [IPPD]; 2,2,4-trimethyl-1,2-dihydroquinoline [TMQ], and 2,6-di-tert-butyl-p-cresol [BHT]) were prepared. The SMR L compounds were cured at 150 C according to their cure time. Curing characteristics, tensile and aging properties, thermal behavior, and morphological properties of the SMR L compounds were studied. Curing and tensile properties obtained by SMR L compounds with MPP are comparable to SMR L compounds with commercial antioxidants. It was found that the addition of MPP into SMR L compounds improved the aging property of the compound. J. VINYL ADDIT. TECHNOL., 00:000-000, 2015.
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