Mechanical properties of sulphur prevulcanised and gamma radiation vulcanised natural rubber and carboxylated styrene butadiene rubber latices and their blends

Stephen R., . and Thomas S., . and Joseph K., . Mechanical properties of sulphur prevulcanised and gamma radiation vulcanised natural rubber and carboxylated styrene butadiene rubber latices and their blends. pp. 78-95. ISSN 1511-1768

Blends of natural rubber and carboxylated styrene butadiene rubber latex with varying blend ratio were prepared. The blends were vulcanised by different techniques which include sulphur prevulcanisation and gamma radiation vulcanisation. Morphology of the blends was investigated from scanning electron micrographs. Mechanical properties such as tensile strength tear strength elongation at break and modulus were studied with reference to blend ratio and vulcanisation techniques. The crosslink density of the blends and individual components were determined from the swelling and stress-strain measurements. The sulphur prevulcanisation of latices was carried out at 70C for 2 h.The radiation vulcanisation of various systems was carried out using n-butyl acrylate as sensitiser at a dose of 15 kGy/h. The swell ratio of the samples was calculated. The radiation vulcanised systems showed comparable properties as that of sulphur prevulcanised systems. However the modulus of radiation vulcanised latex films was lower than prevulcanised samples. The gamma radiation vulcanised latices are eco-friendly due to the absence of curing agents. Applicability of various theoretical models were investigated to predict the modulus of the blends.

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Abstract

Blends of natural rubber and carboxylated styrene butadiene rubber latex with varying blend ratio were prepared. The blends were vulcanised by different techniques which include sulphur prevulcanisation and gamma radiation vulcanisation. Morphology of the blends was investigated from scanning electron micrographs. Mechanical properties such as tensile strength tear strength elongation at break and modulus were studied with reference to blend ratio and vulcanisation techniques. The crosslink density of the blends and individual components were determined from the swelling and stress-strain measurements. The sulphur prevulcanisation of latices was carried out at 70C for 2 h.The radiation vulcanisation of various systems was carried out using n-butyl acrylate as sensitiser at a dose of 15 kGy/h. The swell ratio of the samples was calculated. The radiation vulcanised systems showed comparable properties as that of sulphur prevulcanised systems. However the modulus of radiation vulcanised latex films was lower than prevulcanised samples. The gamma radiation vulcanised latices are eco-friendly due to the absence of curing agents. Applicability of various theoretical models were investigated to predict the modulus of the blends.

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Item Type:	Article
AGROVOC Term:	Mechanical properties
AGROVOC Term:	Sulphur
AGROVOC Term:	Vulcanization
AGROVOC Term:	Gamma radiation
AGROVOC Term:	Natural rubber
AGROVOC Term:	Styrene
AGROVOC Term:	Polymers
AGROVOC Term:	Latex
AGROVOC Term:	Blending
AGROVOC Term:	Elasticity
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/23094

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