AbstractDynamic mechanical analysis from −150 to +150°C has been carried out on seven block copolymers that were prepared by thein situanionic polymerization of caprolactam in the presence of a preformed polyurea. The various relaxations have been identified and activation energies calculated. Some polymer–polymer miscibility of the polyurea and amorphous nylon copolymer segments is indicated by the compositional dependence of the α relax
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