Paper number 213

EFFECT OF DEBONDING MICROPROCESSES ON PARTICULATE FILLED POLYOLEFINES FLOW AND FRACTURE. I. YIELD STRESS1

Victor G. Oshmyan, Irena L. Dubnikova

N.N.Semenov Institute of Chemical Physics Russian Academy of Sciences,
Kosygin st. 4, 117977 Moscow

Summary

Effect of filler fraction and size on debonding mechanism, debonding stress, portion of debonded particles and yielding of particulate filled polypropylene (PP) and polyethylene (HDPE) have been studied. Transitions from uncorrelated to correlated debonding and (as a consequence) from microuniform to craze-like flow at approximately " 15 vol.% of filler fraction have been discovered. The transition between debonding mechanisms is caused by an increase in the intensity of mechanical fields interaction with loading. The phenomenon has been described in terms minimum work criterion. Theoretical estimation of the transitional loading as 11 vol.% is slightly below the experimental value.

Keywords

polymer, filler, composites, mechanical properties, yielding, debonding.