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Phase behavior of rigid, amphiphilic star polymers

Autor(en)
Christian Koch, Athanassios Z. Panagiotopoulos, Federica Lo Verso, Christos N. Likos
Abstrakt

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.

Organisation(en)
Computergestützte Physik und Physik der Weichen Materie
Externe Organisation(en)
Princeton University, MPC Materials Physics Center
Journal
Soft Matter
Band
9
Seiten
7424-7436
Anzahl der Seiten
13
ISSN
1744-683X
DOI
https://doi.org/10.1039/c3sm51135a
Publikationsdatum
2013
Peer-reviewed
Ja
ÖFOS 2012
103023 Polymerphysik, 102009 Computersimulation, 104018 Polymerchemie
Schlagwörter
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/1cad7649-1904-431b-858b-2d655cb77d9e