Asymmetric polymer mixtures in good solvents: A light scattering study

  • Lila Bouzina
  • Abd-El-Hamid Bensafi
  • Michel Duval
  • Michel RawisoEmail author
Regular Article


Dilute solutions of asymmetric polystyrene/poly(methyl methacrylate) (PS/PMMA) mixtures in toluene and tetrahydrofuran (THF) are investigated by static and dynamic light scattering (SLS and DLS). Both solvents are good solvents for each of the two polymers. In toluene, the PMMA refractive index increment is close to zero and SLS provides a direct measurement of the PS static scattering functions. DLS correlatively leads to a single relaxation mode connected with these PS chains. Contrarily, two modes well separated in time are observed for identical PS/PMMA mixtures in THF. Scattering from the PMMA chains is no longer negligible and partial static scattering functions can only be obtained through SLS-DLS combination. For identical polymer concentration and PS/PMMA mixture composition, PS scattering functions are then found to be different in both solvents. The difference increases with concentration and is only partly due to distinct thermodynamic parameters according to the solvent. PMMA scattering functions lead to similar conclusions. The Random Phase Approximation (RPA) describes all scattering functions. However, the SLS-DLS combination affords a reasonable approximation for extracting the partial static scattering functions only for the lowest concentrations, i.e. provided the cross polymer correlation term remains negligible.

Graphical abstract


Soft Matter: Polymers and Polyelectrolytes 

Supplementary material

10189_2019_11921_MOESM1_ESM.pdf (1.8 mb)
Asymmetric polymer mixtures in good solvents: A light scattering study


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© EDP Sciences / Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Lila Bouzina
    • 1
  • Abd-El-Hamid Bensafi
    • 1
  • Michel Duval
    • 2
  • Michel Rawiso
    • 2
    Email author
  1. 1.Département de Chimie Faculté des SciencesUniversité Abou Bekr Belkaid, MansourahTlemcenAlgeria
  2. 2.Institut Charles Sadron (CNRS-UdS)Strasbourg Cedex 2France

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