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- W2947029792 abstract "Abstract Frequency sweep experiments were performed on poly(vinyl chloride) (PVC) and acrylonitrile butadiene rubber (NBR) as well as their miscible blends PVC/NBR (70/30), PVC/NBR (50/50), and PVC/NBR (30/70) in oscillatory shear. The samples were prepared by mechanical blending at 160˚C. In order to investigate the validity of time temperature superposition (TTS) principle the loss angle δ versus the logarithm of the absolute value of the complex modulus, G* , were plotted. It was shown that the TTS principle is not valid for the above-mentioned polymer materials and therefore they are not thermorheologically simple. Master curves of PVC, NBR, and PVC/NBR (50/50) blend were therefore obtained approximately. Using a nonlinear regression method, discrete relaxation spectra were determined for PVC, NBR, and PVC/NBR (50/50). To study non-linear viscoelasticity behavior, the experiments of steady shear, start up steady shear, and step strain were carried out. The damping function was determined by the step strain experiments. Using K-BKZ constitutive equation, the shear viscosity and the shear stress growth function were calculated from the discrete relaxation spectra and the damping function and then compared to experimental data. The K-BKZ constitutive equation provides very good prediction over the entire range of experimental results." @default.
- W2947029792 created "2019-06-07" @default.
- W2947029792 creator A5005555279 @default.
- W2947029792 creator A5067759329 @default.
- W2947029792 date "2004-08-01" @default.
- W2947029792 modified "2023-10-18" @default.
- W2947029792 title "Discrete Relaxation Spectrum and K-BKZ Constitutive Equation for PVC, NBR and Their Blends" @default.
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- W2947029792 doi "https://doi.org/10.1515/arh-2004-0010" @default.
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