Poly(ether-urethanes) based on 4,4 0 -methylene bis (4-phenylisocyanate) or toluene diisocyanate and poly(tetramethylene oxide) have been synthesised varying the molecular weight of the soft segment. The hard/soft segment mixing has been studied by differential scanning calorimetry and Fourier transform infrared spectroscopy. The polymers have been exposed to UV radiation, and the changes in the chemical structure have been analysed by FTir spectroscopy. The extent of the photodegradation in the urethane linkage increases with soft segment molecular weight. The phase separated structure is a critical factor which must be taken into account in order to study the photodegradation of the hard segments in poly(ether-urethanes).
Посилання на статтю:
Aromatic poly(ether-urethanes): effect of the polyol molecular weight on the photochemical behaviour / L. Irusta, M.J. Fernandez-Berridi // Polymer. – 1999. – N 40. – P. 4821–4831.