Microphase separation in interpenetrating polymer networks

摘要: Dielectric relaxation spectroscopy tehcniques, covering broad ranges of frequency (10 exp -3 -10 exp 9 Hz) and temperature (77-400K) are used to stduy the mechanisms of molecular mobility and phase separation in interpenetrating polymer networks of polyurethane and butylmethacrylate-triethylene glycol dimethacrylate copolymer. Two relaxation processes were observed in the dielectric measurements: the secondary beta -relaxation (due to copolymer) and alpha -relaxation due to the glass-rubber transition of polyurethane (PUR) phase. The temperatures of primary transitions of IPNs were obtained using volume dilatometry measurements.