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Polymers |
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| The
development of the Perturbed Chain Statistical Associating Fluid , PC-SAFT,
equation of state has produced a model that can be applied to complex and
macromolecular compounds. Many papers in the literature have detailed its
application to highly asymmetric and associating mixtures. However a major
application must be its ability to handle polymeric systems. Due to the large
difference in the molecular sizes of polymers and solvents the excess Gibbs
free energy models fail to predict the phase and volumetric behaviour.
A polymer can be represented by several components, each of which represents the same polymer structure but which are of different lengths—similar to pseudo components for an oil. Each sub-polymer is composed of a different number of segments and has a different molecular weight, allowing for poly dispersity. A homopolymer is made up of segments that are identical however, in practice most industrially produced polymers are not homo-polymers but copolymers, composed of different types of repeat units. The repeat units may be arranged alternately or in a random fashion. The Multiflash implementation allows the user to define up to four different polymer segments. For more information please see our PC-SAFT leaflet or case study. |
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| For further information please contact: Dr Beryl Edmonds, Infochem Computer Services Ltd, 13 Swan Court, 9 Tanner Street, London SE1 3LE, UK Tel: +44 20 7357 0800 Fax: +44 20 7407 3927 Email: marketing@infochemuk.com Please send comments and suggestions about our website to info@infochemuk.com This page was last revised in May 2006. |