The shear activation volumes of miscible polystyrene-poly(2,6-dimethyl-1,4-phenylene oxide) (PS-PPO) blends at different PS-PPO ratios were determined experimentally by both plane strain and uniaxial compression at constant strain rates. We find that the shear activation volume is proportional to the entanglement density to the 0.6 power, and this correlation holds for the blend as well as for various pure glassy polymers. Since the shear activation volume is closely related to the size of the plastic shear zones, this correlation suggests that the cooperativity of the elementary processes of plastic deformation in glassy polymers scales with the entanglement density.
|Materials Research Society symposium proceedings
|conference; Polymer/metal interfaces and defect mediated phenomena in ordered polymers : symposia held December 2-6, 2002, Boston, Massachusetts, USA; 2002-12-02; 2002-12-06
|2/12/02 → 6/12/02
|Polymer/metal interfaces and defect mediated phenomena in ordered polymers : symposia held December 2-6, 2002, Boston, Massachusetts, USA