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- W2121308308 abstract "The phenomenon of extrudate distortion, which is called melt fracture, was studied for polystyrene samples of narrow and broad molecular weight distribution, and commerical samples of polypropylene and linear and branched polyethylene. It was experimentally found that the shear stress at the onset of melt fracture (τcr) is of the order of 106 dynes/cm2 and independent of the distribution of molecular weights. As the weight average molecular weight increases the shear stress τcr decreases. For polystyrene extruded at τcr the recoverable shear strain, which is defined to be half the ration (first normal stress difference/shear stress), was found proportional to the factor MzMz+1/Mw2 which represents the distrubution of molecular weights. The proportionality is expected to hold for other polymer systems. The polymer behavior at the onset of melt fracture was explained in terms of Graessley's entanglement theory and his correlation between true and Rouse shear compliance." @default.
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- W2121308308 date "1972-05-01" @default.
- W2121308308 modified "2023-09-26" @default.
- W2121308308 title "Critcal stress and recoverable shear for polymer melt fracture" @default.
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- W2121308308 doi "https://doi.org/10.1002/pen.760120305" @default.
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