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Title: Studying Non-Newtonian /Newtonian Polymer Blends Using Large Amplitude Oscillatory Shearing Flow
Authors: Isameldeen E. Daffallah 
Supervisor: Dr. Abdulwahab S. Almusallam
Keywords: Amplitude : Polymer Blends
Issue Date: 2018
Publisher:  Kuwait university - college of graduate studies
Abstract: Large amplitude oscillatory shear (LAOS) was carried out on non-Newtonian /Newtonian polymer blends. The blend consists polybutadiene (PBD) as a droplet phase and polydimethylsiloxane (PDMS) as a matrix phase. The polybutadiene droplet phase was an elastic ‘‘Boger’’ fluid prepared by dissolving a high-molecular-weight polybutadiene into a low-molecular-weight Newtonian polybutadiene. Different percents of the high-molecular-weight PBD were used to prepare different types of Boger fluids that resulted in blends with different viscosity ratios from lower than unity, to unity and higher than unity. Furthermore, the LAOS results of the blends were analyzed by using the Fourier Transform (FT) technique. From a theoretical point of view, the constrained volume model for Newtonian components is adapted to the case of a Newtonian matrix phase and non-Newtonian Boger fluid droplet phase by taking into account normal forces or stresses that arise in the Boger fluids. The adapted model and the Newtonian CV-model were compared to the experimental results of FT-LAOS for checking the predictability of the model to the rheological properties. The adapted model shows a better qualitative and quantitative with the FT- harmonics for the first, third and fifth for higher than unity viscosity ratio, while for lower than unity and equal to unity some reasonable qualitative agreements were achieved.
Appears in Programs:0640 Chemical Engineering

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