| Abstract: | The physical structure of a number of styrene-butadiene copolymers were investigated via dynamic mechanical and swelling studies on uncrosslinked and gamma-radiation cross-linked films that had initially been solvent cast from toluene or methyl ethyl ketone. The mechanical behavior of these films before and after crosslinking was found to depend on the material history as well as the chemical structure of the copolymer, in agreement with observations made by other experimental techniques. A simple morphological interpretation was given to the dynamic mechanical spectra as a function of radiation dosage and a limited discussion of the swelling behavior is included. |
