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Short discussion of static properties of dense polymer melts in two dimensions : CMA Monte Carlo Simulation vs Molecular Dynamics

Polanowski P., Jeszka J. K.

Computational Methods in Science and Technology

2020

Vol. 26, No. 4

137-142

In this paper we present the results of an extensive Monte Carlo lattice simulation of two dimensional dense athermal polymer solutions using the Cooperative Motion Algorithm (CMA). Simulations were performed for a wide range of polymer chain length N which varies from 32 to 1024 and for high concentration of polymer. Our results were compared with those obtained by means of molecular dynamics [1].

Pressure drops in convergent flows of polymer melts

Walicka A., Walicki E.

International Journal of Applied Mechanics and Engineering

2010

Vol. 15, no 4

1273-1285

Practical moulding processes of polymer melts involve geometrically complex dies. Such dies are usually tapered or streamlined as e.g. wedge or conical dies, to achieve maximum output rate under conditions of laminar flow. The models of generalized second grade fluids of a Shulman type are used and the results obtained are illustrated by examples of conical and wedge flows of power-law type and Bingham type fluids and the formulae for pressure drops were presented.

Continuous relaxation spectrum - its advantages and methods of calculation

Malkin A. Y.

International Journal of Applied Mechanics and Engineering

2006

Vol. 11, no 2

235-243

Some advantages in treating experimental data on viscoelastic properties of polymeric materials in terms of a continuous spectrum instead of generally used fitting these data by means of a discrete relaxation times spectrum were demonstrated. The proposed continuous spectrum of a power-like type contains only three adjustable parameters. They can be found from integral characteristics of viscoelastic material, such as instantaneous modules, Newtonian viscosity, areas under shear and normal stress relaxation curves. The proposed continuous spectrum correctly reflects main peculiarities of viscoelastic properties of real polymeric materials in a wide frequency range.