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Dynamic mechanical properties of short isora fibre reinforced natural rubber composites
von Dr. Lovely Mathew, Dr. Rani Joseph
Isora, a natural bast fibre separated from the bark of Helicteres isora plant was used as reinforcement for natural rubber. The dynamic mechanical behaviour of the composite are reported in this paper. The viscoelastic properties like storage modulus, loss modulus etc, are improved with fibre addition. The effects of fibre loading and fibre orientation and temperature on the dynamic properties of the composites have also been investigated.
With the increase of temperature these properties decreased sharply indicating a possible deterioration of the polymer at higher temperatures. To improve the fibre matrix adhesion, the fibre was treated with alkali and silane. While the storage modulus improved with this modification, the loss modulus and tan δ were decreased showing better fibre matrix interaction.
The silane treatment showed the least tan δ value. Addition of bonding agent to the matrix also affects the viscoelastic properties considerably. Bonded composites showed improved storage modulus and decreased loss factor than that of the unbonded composites.