Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2007-03-21
Chemical and Physical News 32 (2006) 6
Physics
Condensed Matter
Soft Condensed Matter
3 figures
Scientific paper
In this work, we consider a semi-dilute solution of identical star-polymers, made of attached flexible long polymer chains of the same polymerization degree N. We first compute the effective pair-potential between star-polymers. Such a potential results from the excluded volume forces between monomers. We show that this potential is logarithmic, below some known characteristic distance, σ, depending on the number of attached chains per star-polymer, f, and volume fraction of polymers, φ0 . Beyond σ, the potential fails exponentially. Second, we investigate the structure and thermodynamics of these star-polymers. To this end, we use the integral equation method with the hybridized-mean spherical approximation. The numerical resolution of this equation gives the structure factor of the star-polymers, for various particle densities. Finally, the standard relationships between thermodynamics and structure enable us to deduce three physical quantities, namely the isotherm compressibility, pressure and internal energy, as functions of density.
Benhamou Mabrouk
Benzouine F.
Bettachy A.
Derouiche A.
Yassine M.
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