Effect Of Additives On The Mechanical, Solvent Transport And Heat Ageing Properties Of Rubber Vulcanizates

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dc.contributor.authorYahya, Siti Rohana
dc.date.accessioned2018-08-06T01:30:06Z
dc.date.available2018-08-06T01:30:06Z
dc.date.issued2011-04
dc.description.abstractThe influence of additives which are the ratio of accelerator to sulfur, antioxidant, and fillers on the properties natural rubber (NR) vulcanizates were investigated in this study. The mechanical and solvent transport properties of rubber vulcanizates before and after ageing for 2, 4, 6, 9, and 12 days at 100oC were carried out. Results indicated that the NR vulcanizates have better processability and mechanical properties than synthetic rubbers (SBR and EPDM). However, NR vulcanizates showed poor heat ageing and solvent resistance due to the present of highly unsaturated backbone structure. Vulcanizates cured with conventional vulcanization (CV) system exhibited better mechanical properties and solvent transport resistance but poorer thermal properties compared with vulcanizates with efficient vulcanization (EV) system due to high content of thermally unstable polysulfidic crosslinks. After aged for four days at 100 oC, the NR vulcanizates cured with CV system loss the ability to strain induced crystallization. The utilization of 2 phr IPPD as antioxidant has improved the tear strength, solvent transport resistance, and thermal properties of NR vulcanizates. The incorporation of maerogel in NR vulcanizates increased the mechanical properties and thermal stability especially at 3 phr of maerogel loading for single filler systems and 17/3 phr of carbon black/maerogel loading for hybrid filler system. The utilization of 17/3 phr in hybrid filler vulcanizates improved the solvent transport resistance compared with single filler vulcanizates. The addition of 0.5 phr Si-69 coupling agent in NR vulcanizates showed the enhancement of mechanical properties and solvent transport resistance.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/6181
dc.language.isoenen_US
dc.publisherUniversiti Sains Malaysiaen_US
dc.subjectThe influence of additivesen_US
dc.subjectthe ratio of accelerator to sulfuren_US
dc.titleEffect Of Additives On The Mechanical, Solvent Transport And Heat Ageing Properties Of Rubber Vulcanizatesen_US
dc.typeThesisen_US
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