Special solution behavior of soluble intramolecularly cross-linked macromolecule of polyurethane with a hexaethylene diamine chain extender

The intramolecularly cross-linked macromolecule (ICM) is expected to have special solution behavior thanks to its network structure compared with linear, branched macromolecules. In this paper ICM was synthesized in concentrated solution and its solution behavior is investigated. The dynamic light scattering (DLS) experimental results show that the particle size at any time is different and decreases with decreasing concentration. This indicates that ICM tends to form molecular clusters (MCs) in solution and that the formation and dissociation of the MC is in a nonequilibrium state, which might be attributed to its network structure. The aggregation force in MC is not strong, so that MC can be easily dissociated by the collision of ICM and impacting of solvent molecules. The experimental results also show that the degree of cross-linking has great influence on the aggregation of ICMs in solution.