Interpenetrating polymer networks (IPNs) of 2-hydroxyethyl methacrylate terminated polyurethanes (HPU) and polyurethanes (PU) with different ether-type polyols were prepared by simultaneous solution polymerization. Differential scanning calorimetry showed that the compatibility of polymers in IPN formation depends on the molecular weight of the prepolymers. Compatible IPN systems resulted in greater-than-average density values and reduced swelling behaviour. Water absorption of the IPNs was found to be mainly determined by the hard-to-soft segment ratio of the materials. The maximum tensile modulus occurred at a 25 wt% HPU content for the compatible systems and a 12.5 wt% HPU content for those that were incompatible. The maximum tensile strength occurred at a 25 wt% HPU content for all the IPN systems. Morphological observations using a scanning electron microscope revealed different fracture surfaces between the compatible and incompatible systems.
Посилання на статтю:
Interpenetrating polymer networks of 2-hydroxyethyl methacrylate terminated polyurethanes and polyurethanes / Tsung-Tang Hsieh, Kuo-Huang Hsieh, George P. Simon, Carlos Tiu // Polymer. – 1999. – N 40. – P. 3153–3163.