منابع مشابه
Viscoelastic Properties of Polymer Melts from Equilibrium Molecular Dynamics Simulations
Introduction. The dynamics of polymer chains are now generally very well understood in the pioneering frameworks of the Rouse model for short chains, and the reptation model for longer chains.1-5 While these theories yield well-known expressions for the variation of the diffusivity D and viscosity η with the chain length N, an open question is the chain length at which one crosses over from Rou...
متن کاملViscoelastic dynamics of confined polymer melts.
The frequency-dependent shear response of an ultrathin polymer melt (polyphenylmethylsiloxane) confined between adsorbing surfaces (parallel plates of mica) is described. The sinusoidal deformations were sufficiently small to give linear response, implying that measurement did not perturb the film structure. A remarkable transition was observed with decreasing thickness. When the film thickness...
متن کاملComputer Simulation of Entanglements in Viscoelastic Polymer Melts
No part of this work may be reproduced by print, photocopy or any other means without the permission in writing from the publisher. Dit proefschrift is goedgekeurd door: Prof. dr. W.J. Briels (promotor) " Convictions are more dangerous enemies of truth than lies. "-Friedrich Nietzsche
متن کاملProperties 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...
متن کاملViscoelastic properties of bamboo
Dynamic viscoelastic properties of bamboo were determined in torsion and bending. Damping, measured by tan δ, in dry bamboo was relatively small, about 0.01 in bending and 0.02 to 0.03 in torsion, with little dependence on frequency in the audio range. In wet bamboo, damping was somewhat greater: 0.012 to 0.015 in bending and 0.03 to 0.04 in torsion. The anisotropy in damping implies a purely c...
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ژورنال
عنوان ژورنال: Nihon Reoroji Gakkaishi(Journal of the Society of Rheology, Japan)
سال: 1976
ISSN: 0387-1533
DOI: 10.1678/rheology1973.4.2_52