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It is suggested that the existence of yield values in the elongational viscosity of concentrated suspensions of small particles in polymer melts leads to enhanced instability of uniaxial stretching and melt-spinning behavior. This is supported by analyses of filament stability. Severe instabilities are found in experiments on both simple stretching and melt spinning of filaments of suspensions of carbon black, titanium dioxide, and calcium carbonate in polystyrene. Necking and low elongations to break are observed in the former case. The melt-spinning results show “draw resonance” occurring at low drawdown ratios and high amplitudes of disturbances in the unstable region.
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White et al. (1981) studied this question.
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