Perspectives on the viscoelasticity and flow behavior of entangled linear and branched polymers.

Effects of Surface Viscoelasticity on Cellular Responses of Endothelial Cells

Background: One area of nanoscience deals with nanoscopic interactions between nanostructured materials and biological systems. To elucidate the effects of the substrate surface morphology and viscoelasticity on cell proliferation, fractal analysis was performed on endothelial cells cultured on nanocomposite samples based on silicone rubber (SR) and various concentrations of organomodified nano...

The rheology and microstructure of branched micelles under shear

The rheology and shear-induced structures of a series of self-assembled surfactant worm-like micelles (WLMs) with varying levels of branching are measured using rheoand flow-small angle neutron scattering (SANS). The degree of branching in the mixed cationic/anionic surfactant (CTAT/SDBS) WLMs is controlled via the addition of the hydrotropic salt sodium tosylate and verified by cryo-TEM. The l...

Stress Overshoot of Polymer Solutions at High Rates of Shear

Overshoot of shear stress, s, and the first normal stress difference, N1, in shear flow were investigated for polystyrene solutions. The magnitudes of shear corresponding to these stresses, gsm and gNm, for entangled as well as nonentangled solutions were universal functions of ġteq, respectively, and gNm was approximately equal to 2gsm at any rate of shear, ġ. Here teq 5 tR for nonentangled sy...

An Enhanced Finite Element method for Two Dimensional Linear Viscoelasticity using Complex Fourier Elements

In this paper, the finite element analysis of two-dimensional linear viscoelastic problems is performed using quadrilateral complex Fourier elements and, the results are compared with those obtained by quadrilateral classic Lagrange elements. Complex Fourier shape functions contain a shape parameter which is a constant unknown parameter adopted to enhance approximation’s accuracy. Since the iso...

Study on Linear Density Effect on the Vibration Behavior of Textile Strings Using Video Processing