Large Homogeneous Biaxial Extension of Polyisobutylene and Comparison with Uniaxial Behaviour
Compared with the activity during the last decade in uniaxial extension of polymer melts, the investigation of their biaxial behaviour has been rather limited because of experimental difficulties. In a previous paper /1/, a new type of biaxial rheometer has been described, which has distinct advantages over the conventional bubble inflation technique. Using this new rheometer, equibiaxial extensional experiments on polyisobutylene at room temperature (22°C) and constant strain rates have been made. The results of these experiments are compared with the response of the same material in uniaxial extension and simple shear.
KeywordsConstant Strain Rate Radial Strain Uniaxial Extension HENCKY Strain Nominal Strain Rate
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