منابع مشابه
Transient rheology of a polyethylene melt under shear.
Using nonequilibrium molecular dynamics simulation, we have studied the response of a C100 model polymer melt to a step change from equilibrium to a constant, high shear rate flow. The transient shear stress of the model polymer melt exhibits pronounced overshoot at the strain value predicted by the reptation model, in striking similarity to melts of longer, entangled polymer governed by reptat...
متن کاملMelt Rheology of Poly(Lactic Acid)/Low Density Polyethylene Polymer Blends
In this work, rheological properties of poly(lactic acid) (PLA), low density polyethylene (LDPE) polymer blends were investigated in the molten state. The experiments were carried on a capillary rheometer. The effect of shear stress, temperature and blending ratio on the flow activation energy at a constant shear stress and melt viscosity of the blends are described. The results showed that the...
متن کاملRheology
researchers write. So, during the dry season, the entire population is represented by developing eggs that incubate for 8–9 months, before hatching synchronously at the beginning of the following rainy season. “Remarkably, this chameleon spends more of its short annual life cycle inside the egg than outside it,” they report. The authors reviewed data on the life cycle of more than 1,700 tetrapo...
متن کاملstudy on the dynamic melt rheology of low and high-density polyethylene/ethylene-vinyl acetate copolymer blends
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متن کاملFundamentals of Rheology
Some important fundamental aspects of fluid mechanics and rheology are discussed. First, we examine the basis for the continuum approximation of fluids, and the formulation of equations in the continuum description. Then, we look at stress-strain rate relationships for simple shear flows of both viscous and viscoelastic fluids. The extension of the description to complex flows, which involves t...
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ژورنال
عنوان ژورنال: journal of the Japan Society for Testing Materials
سال: 1959
ISSN: 0372-7971
DOI: 10.2472/jsms1952.8.284