15-20 June 2014
Laurentian University / Université Laurentienne
America/Toronto timezone
Welcome to the 2014 CAP Congress! / Bienvenue au congrès de l'ACP 2014!

Phase Behaviour of Polyelectrolyte/Homopolymer Blends

17 Jun 2014, 14:30
A-226 (Laurentian University / Université Laurentienne)


Laurentian University / Université Laurentienne

Sudbury, Ontario
Oral (Student, In Competition) / Orale (Étudiant(e), inscrit à la compétition) Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM) (T2-6) Biophysics/Soft Condensed Matter I: Polymers - DCMMP-DMBP / Biophysique et matière condensée molle 1: polymères - DPMCM-DPMB


Mr Ashkan Dehghan (McMaster University)


The phase behaviour of polyelectrolyte/homopolymer blends is studied using self-consistent field theory. The blends are composed of charged and neutral homopolymers plus counter ions dissociated from the polyelectrolytes. We explore the phase behaviour of the system as a function of blend composition, charge density and interaction parameter. Besides the usual macrophase separation behaviour, the SCFT predicts that under appropriate conditions the system undergoes microphase separation, forming various ordered phases similar to diblock copolymers. We found that the formation of ordered structures is the result of the balance between the interactions and the mixing entropy of the ions. In particular, the domain size of the ordered phases is determined by the competition between the polymer-polymer interaction and counter ion entropy, thus it is not limited by polymer size. Increase in the repulsive interaction between the chains results in an increase in the domain spacing.

Primary authors

Dr An-Chang Shi (McMaster University) Mr Ashkan Dehghan (McMaster University) Mrs Youhai Sun (McMaster University)

Presentation Materials