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 modulatedtemperature 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. MTDSC 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.
Посилання на статтю:
Modulated-temperature differential scanning calorimetry: 15. Crosslinking in polyurethane–poly(ethyl methacrylate) interpenetrating polymer networks / D.J. Hourston, M. Song, F.-U. Schafer, H.M. Pollock, A. Hammiche // Polymer. – 1999. – N 40. – P. 4769–4775.