Influence of polydispersity and long chain branching on the melt viscosity of polycarbonate |
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Authors: | Z Dobkowski |
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Institution: | Institute of Industrial Chemistry, Rydygiera 8, 01-793 Warszawa, Poland |
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Abstract: | The Newtonian and non-Newtonian melt viscosities of bisphenol A polycarbonate (PC) at 280°C were treated according to the generalized multivariable power function, where the average molecular weights, polydispersity degree and branching degree are considered as variables. The shear rate was also considered as a variable for non-Newtonian conditions. In the same way, the melt fluidity was treated as a multivariable power function. It has been found that the same melt flow properties of polymer can be obtained by an appropriate combination of Newtonian melt viscosity (being a function of molecular weight) and long chain branching. The experimental data on PC agree with the theoretical approach of Bucche and Graessley. |
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