Colloid and Polymer Science

, Volume 274, Issue 7, pp 634–639 | Cite as

On the resistance to the interpenetration between macromolecular coils of different segment densities

  • A. Dondos
  • D. Papanagopoulos
Original Contribution

Abstract

Using viscometry techniques on polymer fractions, we determine the critical concentrationc* (separating the dilute and semi dilute solutions). The same measurements have been conducted with mixtures of these fractions (mixtures 1:1 by weight of fractions differing in molecular mass and chemical nature, or fractions differing only in molecular mass). The determined values of critical concentrationc* of the mixtures are higher than the values calculated based on the critical concentrations of the corresponding fractions. This deviation from the additivity rule is attributed to the resistance in the interpenetration (delay to the attainment of the homogeneous state) between macromolecular coils of different chemical nature or of the same chemical nature but of different molecular mass. Higher values of the reduced viscosities of the mixture of the fractions, compared to the values calculated using the reduced viscosities of the corresponding fractions, are observed above the critical concentrationc*. In this concentration region the interaction parameter between two different polymers is calculated.

Key words

Binary polymer mixtures dilute solutions semi dilute solutions overlap concentrationc* 

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Copyright information

© Steinkopff Verlag 1996

Authors and Affiliations

  • A. Dondos
    • 1
  • D. Papanagopoulos
    • 1
  1. 1.Department of Chemical EngineeringUniversity of PatrasPatrasGreece

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