High impact strength, high transparency cast sheets of polyurethane (PU)-reinforced poly(methyl methacrylate) (PMMA) were obtained by means of IPN techniques. The PU content was kept low (less than 10%). The impact strength is maximum at a critical PU concentration, and for a given morphology. The study of various synthesis parameters led to the conclusion that the size of interstitial PMMA nodules - and therefore the optical and mechanical properties of the final material - are determined by the crosslink density of the swollen PU network at the onset of the methyl methacrylate polymerization.
Посилання на статтю:
High impact cast sheets of poly(methyl methacrylate) with low levels of polyurethane / Ph. Heim*, C. Wroteckit, M. Avenel and P. Gaillard // Polymer. – 1993. – Vol 34. – P. 1653-1660.