Effect of low temperature curing on short isora fibre reinforced natural rubber composites

Mathew L., . and Joseph R., . and Palatty S., . Effect of low temperature curing on short isora fibre reinforced natural rubber composites. pp. 21-39. ISSN 1511-1768

Isora a natural fibre obtained from Helicteres isora plant is used for reinforcement of rubber composites. The fibre is separated from the bark of the plant by a retting process. Composites were prepared using chopped untreated and alkali treated isora fibre of lengths 10 mm at different fibre loadings in natural rubber (NR) using both low temperature curing accelerators (ZDC/xanthates) and conventional accelerators (CBS/TMTD). The bonding between the fibre and rubber was improved by the use of RF resin. Cure characteristics of the composites heated tovarious temperatures were studied. The mechanical properties of the composites prepared using a conventional system were compared with those of the composite prepared using xanthates at different temperatures from 80C 140C. Composites with the conventional accelerator system were vulcanised at 150C. The results showed that the xanthates were effective in low temperature curing of NR and the composite vulcanised at 100C showed optimum properties.At high temperature fibre and rubber showed a tendency to degrade and hence a decrease in properties. Alkali treated fibre composites showed enhancement of mechanical properties in both systems. Properties are improved by the use of bonding agent. The tensile fractured surface has been investigated by SEM studies and the failure mechanism has been explained. The swelling behaviour of these composites were also studied in toluene and it was found that low temperature cured composites restrict swelling considerably.

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Abstract

Isora a natural fibre obtained from Helicteres isora plant is used for reinforcement of rubber composites. The fibre is separated from the bark of the plant by a retting process. Composites were prepared using chopped untreated and alkali treated isora fibre of lengths 10 mm at different fibre loadings in natural rubber (NR) using both low temperature curing accelerators (ZDC/xanthates) and conventional accelerators (CBS/TMTD). The bonding between the fibre and rubber was improved by the use of RF resin. Cure characteristics of the composites heated tovarious temperatures were studied. The mechanical properties of the composites prepared using a conventional system were compared with those of the composite prepared using xanthates at different temperatures from 80C 140C. Composites with the conventional accelerator system were vulcanised at 150C. The results showed that the xanthates were effective in low temperature curing of NR and the composite vulcanised at 100C showed optimum properties.At high temperature fibre and rubber showed a tendency to degrade and hence a decrease in properties. Alkali treated fibre composites showed enhancement of mechanical properties in both systems. Properties are improved by the use of bonding agent. The tensile fractured surface has been investigated by SEM studies and the failure mechanism has been explained. The swelling behaviour of these composites were also studied in toluene and it was found that low temperature cured composites restrict swelling considerably.

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Item Type:	Article
AGROVOC Term:	Natural rubber
AGROVOC Term:	Low temperature
AGROVOC Term:	Fibres
AGROVOC Term:	Elastomers
AGROVOC Term:	Zinc
AGROVOC Term:	Mechanical properties
AGROVOC Term:	Fractures
AGROVOC Term:	Vulcanization
AGROVOC Term:	Toluene
AGROVOC Term:	Retting
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/23090

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