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The large-strain tensile deformation of high-density polyethylene and high-density polyethylene filled with two volume fractions (f) of calcium carbonate particles is studied via an optical method. Digital image correlation is used to determine the local displacement gradients and full-field displacements during uniaxial tension tests on specimens of rectangular cross-section. A novel technique measures...
The mechanisms of deformation and fracture of isotactic polypropylene filled with CaCO3 particles were studied. Three types of particles with average diameters of 0.07, 0.7, and 3.5μm were used at filler volume fraction from 0.05 to 0.30. The experiments included slow tensile tests, notched Izod impact tests with varying notch depths, and fracture resistance tests using double-cantilever-beam sample...
The mechanical behavior of Nylon-6 blends modified by two types of CaCO 3 particles of 0.7 and 3.5μm diameter with particle volume fractions ranging from 0.05 to 0.28 was studied between -30 and 60 o C in slow tension, and at 20 o C in bending impact. Additional experiments were also carried out at 20 o C to determine the plane stress fracture toughness of the blends...
Rubber-modified polyamides were probed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), small-angle X-ray scattering and various mechanical tests. TEM studies showed that in tough samples the crystalline orientation in the interparticle region is of a distinctly different character. The lamellae are organized perpendicular to the rubber-matrix interface, while the...
The microstructural processes of fracture in rubber-modified polyamides were studied in blends of polyamide 66/ethylene-propylene-diene rubber (PA66/EPDR) in Izod bending impact experiments. Izod tests were performed at various temperatures to determine the ductile-brittle transition as a function of temperature, rubber weight fraction and particle size. Subsequent analysis of the fracture surfaces...
The process of massive cavitational deformation in an ethylene-propylene-diene grafted maleic-anhydride modified polyamide 66, initiated from cavitating rubber particles and associated with stable crack propagation in compact tension and Izod impact experiments, has been studied in the region ahead of the crack front by scanning electron microscopy. The very tough stable ductile tearing behaviour...
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