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Two types of network formation affected by physical factors are discussed:(1) the effect of strong intermolecular interactions in the formation of polyurethane networks, and (2) the effect of strong intermolecular repulsion operative during anionic polymerization of oligoester acrylates. The intermolecular interactions influence also the formation of supermolecular structures and the reaction kinetics.During recent years much attention has been given to the possibility of the occurrence of some kind of local ordering in polymerizing systems. This ordering is considered to be a result of intermolecular interaction1 6, Many experimental structural and kinetic data can be explained if we take into account the existence of such regions7. These data allow us to think that for the most part the reactions of polymer molecule formation, especially in melt, are not those of isolated molecules. Many reactions, even in solution. are reactions between molecules which are found at an interface with some kind of supermolecular structures. composed perhaps of molecular aggregates8.

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X-ray studies on polyurethanes containing arabinose-based polyurethanes the phase sugar derivatives in the main chain were separation is defined least of all. Glucoseperformed. I t was demonstrated that the and dulcitol-based polymers are intermemicrophase separation of rigid and flexible diates as to their supermolecular organizafragments was dependent on the nature of tion. Supermolecular organization models sugar derivatives. The supermolecular or-for block copolyurethanes under investiganization in disaccharide-based polymers gation were proposed. is the most ordered one. In xylose-and