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Issue 31, 2013
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Phase behavior of rigid, amphiphilic star polymers

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Abstract

We determine the phase behavior of rigid, amphiphilic diblock copolymer stars in solution, by employing a lattice model and applying Grand Canonical Monte Carlo simulations as well as histogram reweighting techniques. Previous studies on these systems [C. Koch et al., Mol. Phys., 2011, 109, 3049] have found that for fully flexible chains with a moderate functionality ranging from f = 3 to f = 10 and with a solvophilic A-block smaller than or equal to the solvophobic B-block, the solution undergoes a liquid–gas macrophase separation with a well-defined critical point. We find that the introduction of chain rigidity alters the critical parameters: the higher the stiffness, the higher the critical temperature Tc and the lower the critical density ϕc. Furthermore, we find that for high rigidities and densities beyond ϕc, the molecules arrange in cubic, columnar and lamellar ordered phases whose domain of stability depends on molecular architecture and block incompatibility. For even higher densities the system remelts again into another fluid phase. The resulting rich phase diagrams of star polymers that feature amphiphilicity and high rigidity are a manifestation of the character of these hybrid molecules as polymer-based, soft patchy colloids.

Graphical abstract: Phase behavior of rigid, amphiphilic star polymers

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Article information


Submitted
24 Apr 2013
Accepted
22 May 2013
First published
23 May 2013

Soft Matter, 2013,9, 7424-7436
Article type
Paper

Phase behavior of rigid, amphiphilic star polymers

C. Koch, A. Z. Panagiotopoulos, F. Lo Verso and C. N. Likos, Soft Matter, 2013, 9, 7424
DOI: 10.1039/C3SM51135A

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