Abstract
Blend prepared by the melt mixing of thermoplastic elastomer has gained considerable attention in recent years from heat shrinkability point of view. Present study deals with the measurement of the heat shrinkability of the maleic anhydride grafted poly (ethylene vinyl acetate) and polyurethane elastomer blend. Two samples have been prepared to study the effect of the coupling agent's reactivity on the shrinkability of the blend. The used coupling agents are 4,4′ diamino diphenyl sulphone (DDS) and 4,4′ diamino diphenyl methane (MDA). It is revealed that heat shrinkability increases as the reactivity of the coupling agent increases. The reactivity as well as the shrinkability is more when the used coupling agent is 4,4′ diamino diphenyl methane. The mechanism of interchain crosslinking reaction is confirmed by IR spectroscopy.
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