Recent activity in Polymer Rheology

A viscoelastic polymer is subjected to a constant strain of $0.3$. The behaviour of the polymer follows Maxwell model of linear viscoelasticity. Elastic modulus of the po...

The variation of steady shear viscosity $(\eta)$ of a polymer melt with shear rate $(\dot{\gamma})$ is shown in the figure, where $\dot{\gamma}_{s}$ is the upper limit of...

Which one of the following is NOT a rotational rheometer?Cone and plate rheometerParallel plate rheometerCapillary rheometerCylindrical Couette rheometer

Norrish-Smith effect or Trommsdorff effect during free radical bulk polymerization at high conversion is characterized by $\_\_\_\_$.increase in rate of polymerization wi...

​​​​Which one of the following measures of viscosity is dimensionless?Inherent viscosityReduced viscosityZero-shear viscositySpecific viscosity

\begin{tabular}{|c|c|c|c|c|}\hline \multirow[t]{2}{*}{ Q. 123} & \multicolumn{4}{|c|}{\begin{tabular}{l}Mechanical stress is applied on a polymer. Identify the correct ma...

The 'die swell' phenomenon exhibited by a polymer melt is due toviscous deformationplastic deformationviscous and elastic deformationelastic recovery

Melt flow index $\text{(MFI)}$ of a polymer depends on its molecular weight $(M W)$ and melt viscosity $(\eta)$. Select the correct relation(s) from the following.$\text{...

For a polymer solution, the dependence of viscosity $(\eta)$ on shear rate $(\dot{\gamma})$ is described by the three-parameter Carreau model given by\[\eta=\eta_{0}\left...

The linear viscoelastic behaviour of a polymer is described by the Kelvin-Voigt model consisting of a spring element of elastic modulus $10$ MPa in parallel with a dashpo...