Abstract
A variety of simultaneous and sequential interpenetrating polymer networks (IPNs) based on a polyurethane (PU) network and poly(methyl methacrylate) (PMMA) in linear and network forms were evaluated in terms of dynamic and static mechanical behaviour. IPNs of mid-range composition produced broad tan δ peaks with significant intensities at room temperature to influence elongation to failure. Unusually high elongations at failure were recorded in the simultaneous IPNs due to improved homogeneity in the distribution of the component polymers. The patterns of behaviour of the elastic modulus, hardness and glass transition temperature suggest the occurrence of phase inversion in the simultaneous IPNs and dual-phase continuity in the sequential IPNs. Synergism was experienced in various IPN properties with maximum improvements occurring in the PU/PMMA composition range 30 70 to 40 60 .
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