Abstract
The glass transition behaviour and morphology of 70:30 polyurethane–poly(ethyl methacrylate) (PU–PEMA) interpenetrating polymer networks (IPNs) in which the crosslink density in both networks was systematically varied were investigated by means of modulated-temperature differential scanning calorimetry (M-TDSC) and dynamic mechanical thermal analysis (DMTA). The observed influence on the glass transition temperature, Tg, was similar for both the M-TDSC and DMTA studies, but some substantial differences also existed. M-TDSC was more sensitive to phase separation than DMTA. On increasing the crosslink density in the first-formed PU network, the weight fraction of the interphase component increased. Higher crosslinking levels in the PEMA network had relatively little influence.
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