Suspension-based rheological modeling of crystallizing polymer melts

Determining Molecular Weight Distributions from the Rheological Properties of Polymer Melts

This note is a summary of the state-of-the-art for determining molecular weight distributions from melt rheological properties. It consists of a short introduction, including a summary of the models used, and then focuses on the so-called “Modulus Model” with emphasis on an evaluation of the recently commercialized software from Rheometric Scientific, Inc. It will conclude with a short look int...

Properties of Confined Polymer Melts

Properties of simple models of confined linear polymer chains were studied by means of the Monte Carlo method. Model chains were built of united atoms (statistical segments) and embedded to a simple cubic lattice. Then polymers were put into a slit formed by two parallel impenetrable surfaces. Chain lengths were varied up to 800 segments and the density of the polymer melt was changed up to 0.5...

Nanoparticle Dynamics in Polymer Melts

Reaction Kinetics in Polymer Melts

We study the reaction kinetics of end-functionalized polymer chains dispersed in an unreactive polymer melt. Starting from an infinite hierarchy of coupled equations for many-chain correlation functions, a closed equation is derived for the 2nd order rate constant k after postulating simple physical bounds. Our results generalize previous 2-chain treatments (valid in dilute reactants limit) by ...

Thermodynamic and rheological properties of rhyolite and andesite melts

The heat capacities of a rhyolite and an andesite glass and liquid have been investigated from relativeenthalpy measurements made between 400 and 1800 K. For the glass phases, the experimental data agree with empirical models of calculation of the heat capacity. For the liquid phases, the agreement is less good owing to strong interactions between alkali metals and aluminum, which are not curre...