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Abstract
The cure characteristics, swelling behaviour and tensile properties of carbon black (CB)-filled natural rubber (NR)/chloroprene rubber (CR) blends in the presence of alkanolamide (ALK) were investigated. The NR/CR blends were prepared at 50/50 blend ratio. The ALK was prepared from Refined Bleached Deodorized Palm Stearin (RBDPS) and diethanolamine and added into the CB-filled NR/CR blends as a rubber additive. The ALK loadings were 0.0, 1.0, 3.0, 5.0 and 7.0 phr. It was found that the ALK exhibited shorter scorch and cure times and higher elongation at break of the CB-filled NR/CR blends. The ALK also exhibited higher torque differences, tensile modulus and tensile strength up to 5.0 phr of ALK and then decreased with further increases in the ALK loading. The swelling test proved that the 5.0 phr loading of ALK caused the highest degree in crosslink density of the CB-filled NR/CR blends.
Highlights
The blending of rubber is a mixing operation that blends two or more types of base rubber with a number of rubber additives
ethylene thiourea (ETU) is a toxic material and is suspected to be carcinogenic [4,5] and an appearance of an alternative curing accelerator for chloroprene rubber (CR) has been in demand
Tensile tests were carried out with a universal tensile machine Instron 3366 to determine the tensile properties in terms of tensile strength (TS), stresses at 100% and 300% elongations (M100, M300) and elongation at break (EB)
Summary
The blending of rubber is a mixing operation that blends two or more types of base rubber with a number of rubber additives. Magnesium and zinc oxides (MgO and ZnO) together with ethylene thiourea (ETU) are widely utilised as curative additives for Polychloroprene Rubber (CR) [2,3]. Both of the metal oxides are utilised as curing agents and ETU as the curing accelerator. Based on the above reasons, ALK is likely to yield some good results in replacing the carcinogenic ETU as a curing agent [6] and solving the problem of filler dispersion. The effects of ALK on cure characteristics, swelling behaviour and tensile properties of CB-filled NR/ CR blends were reported
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