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The effect of palm oil fatty acid (POFA) and stearic acid on dynamic properties, curing characteristics and mechanical properties of natural rubber (SMR L) and epoxidized natural rubber (ENR 50) was investigated in the concentration range of 1 to 7 phr. Results indicate that scorch time, t ₂, cure time, t ₉₀ and maximum elastic torque increased with increasing both acid concentrations. The incorporation of palm oil fatty acid and stearic acid in both rubbers also resulted in lower damping (lower tan δ) and lower hysteresis (lower viscous torque). The tensile modulus (modulus at 100% elongation and 300% elongation, M300) and hardness increased with increasing acid concentration whereas tensile and tear strengths increased up to a maximum value and then decreased. At similar acid concentration, stearic acid and palm oil fatty acid in ENR 50 compounds show higher M100, M300 and hardness, but lower tensile and tear strengths than in SMR L compounds.

26:T4f2,

Heat shrinkability of a polymer, which depends on the elastic memory, can be introduced into the system in the form of an elastomeric phase. The present study deals with the measurement of heat shrinkability of a blend of grafted polyethylene and polyurethane elastomer. The grafting materials used are vinyl triacetoxy silane and maleic anhydride. The coupling agents used are ethane diol and 4,4′-diamino diphenyl sulphone. From Torque Rheometry it is found that the maximum amount of interchain crosslinking is obtained in the sample containing silane grafted LDPE. Shrinkability was measured at room temperature, 120°C, 150°C, and 180°C. Shrinkability is greater in the high temperature stretched sample than in the room temperature stretched sample. Shrinkability depends on various factors such as orientation of the stretched sample, unrecoverable viscous flow, which occurs during stretching, and degree of interchain crosslinking. Interchain crosslinking between grafted polyethylene and elastomer improves the shrinkability. Probable interactions between the rubber and plastic phase are confirmed by IR spectroscopy. Extraction of the elastomeric phase is restricted due to interchain crosslinking as confirmed by scanning electron microscopy.

27:T4c5,The Journal of Elastomers and Plastics is a high quality peer-reviewed journal which publishes original research on the development and marketing of elastomers and plastics and the area in between where the characteristics of both extremes are apparent.In addition to original resea