Novel copoly(isocyanurate-urea)s have been produced by reaction injection moulding (RIM). The materials were formed from -,~ 2:1 weight ratio of polyisocyanate to polyoxypropylene polyamine in the presence of an organic trimerization catalyst. In some cases an aromatic diamine chain extender was also used. The effects of the polyether polyamine functionality and the incorporation of aromatic diamine chain extenders on the morphology and properties of the copoly(isocyanurate-urea)s were studied using the SAXS, TEM, d.m.t.a, and tensile stress-strain techniques. The RIM materials were stiff plastics with room-temperature Young's moduli between 1.5 and 0.7 GPa, depending on the morphology. Development of morphology is a result of competition between polymerization kinetics, chemical gelation and (micro)phase separation. Materials with an isotropic, co-continuous morphology with a size-scale of ~ 100,~ had higher moduli than materials containing isolated glassy particles of ~ l #m in size. Correlations between morphology and dynamic mechanical-thermal and tensile stress-strain properties of a systematic series of copoly(isocyanurate-urea)s have been established
Посилання на статтю:
Morphology and properties of novel copoly(isocyanurate-urea)s formed by reaction injection moulding / Anthony J. Ryan*, John L. Stanford and Xiao Qiu Tao // Polymer. – 1993. – Vol 34. – P. 4020-4031.