Effect Of Additives On The Mechanical, Solvent Transport And Heat Ageing Properties Of Rubber Vulcanizates
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Date
2011-04
Authors
Yahya, Siti Rohana
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
The 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.
Description
Keywords
The influence of additives , the ratio of accelerator to sulfur