000			01403nam a2200181Ia 4500
008			220216s9999 xx 000 0 und d
100			_aHan P K
245		0	_aRheological studies of dynamically vulcanized and mechanical blends of polypropylene and ethylene-Propylene rubber
260			_bRubber Chemistry and Technology _c1995
300			_a728-738
520			_aAn experimental study is presented of the rheological properties of (i) polypropylene, (ii) a mechanical blend of a polypropylene and an ethylene-propylene copolymer. The polypropylene behaves as a typical flexible chain thermoplastic exhibiting a zero shear viscosity and higher rate non-Newtonian viscosity, well defined normal stresses, an elongational viscosity three times the zeroshear viscosity, and an equality of the shear viscosity and the complex viscosity (Cox-Merz Rule). The PP/EPDM-TPE exhibits an apparent yield value in shear flow, unmeasurable normal stresses and a complex viscosity which is much greater than the shear viscosity. This is behavior similar to that of particle filled compounds, block copolymers and liquid crystalline thermoplastics and suggests a material with a rest state structure. The behavior of the PP/EPM mechanical blend is intermediate.
650			_aBlend
650			_aEthylene-propylene rubber
650			_aPolypropylene
650			_aRheology
700			_aWhite J L
942			_cJS
999			_c67076 _d67076