Fracture Toughness of Polybutadiene at Cryogenic Temperatures.
AKRON UNIV OH INST OF POLYMER SCIENCE
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An estimate of fracture toughness of crosslined polybutadiene rubber at -180 degrees C has been made using the double torsin method. By using suitable specimen dimensions and strain rates, controlled crack propagatin can be achieved, together with a constant compliance to crack length ratio. Strain energy release rated for this polymer, crosslinked with either dicumyl peroxide or sulphur, were found to be an order of magnitude higher than for linear, glassy thermoplastics. Crazing is considered to contribute to the high toughness observed.