Evaluation of viscosity and shear stress in a telechelic polymer when various shear rates are applied
Articolo
Data di Pubblicazione:
2014
Citazione:
Evaluation of viscosity and shear stress in a telechelic polymer when various shear rates are applied / C. Manassero, C. Castellano. - In: JOURNAL OF POLYMER RESEARCH. - ISSN 1022-9760. - 22:1(2014 Dec). [10.1007/s10965-014-0621-2]
Abstract:
We present the results of molecular dynamics (MD)
simulations of bead and spring models of associating polymers
at melt-like densities.We consider telechelic polymers of
general formula AB12A at different values of shear rate. Under
bulk conditions, A···A associations occur, leading to the construction
of clusters or micelles that are interconnected by a
number of bridging chains. This results in a physical gel or a
reversible network, and the corresponding micelles assume
different forms depending on the interaction strength.
Whenever a low shear deformation is applied, the clusters
are broken and there is a phase transition similar to that from
a gel to a common non-Newtonian fluid. However, if the
applied shear is increased, the chains stretch themselves (in a
manner similar to nematic liquid crystal ordering) in a different
way from what is seen without shear. In this work, we
calculate the stress needed to yield a required deformation.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
associating polymers; shear rate; molecular dynamics
Elenco autori:
C. Manassero, C. Castellano
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