Abstract
Stress relaxation has been investigated in films of block copolymers of polybutadiene and styrene (70:30). Films were prepared from the solvent mixed with a selective precipitant for polystyrene, varying the composition of the mixtures. It was found that a rapid acceleration of relazation processes accompanied by simultaneously reduced equilibrium stress occurs on adding the precipitant to the system right to the point when dispersion is obtained. The swelling of films prepared from a good solvent and from the dispersions was also investigated. The results show the relationship between the rate and equilibrium degree of swelling and the kinetics of the relaxation processes.
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