Role of Chain Length in the Formation of Frank-Kasper Phases in Diblock Copolymers

Ronald M. Lewis, III, Akash Arora, Haley K. Beech, Bongjoon Lee, Aaron P. Lindsay, Timothy P. Lodge, Kevin D. Dorfman, and Frank S. Bates
Phys. Rev. Lett. 121, 208002 – Published 14 November 2018
PDFHTMLExport Citation

Abstract

The phase behavior of poly(styrene)-b-poly(1,4-butadiene) diblock copolymers with a polymer block invariant degree of polymerization N¯b800 shows no evidence of Frank-Kasper phases, in contrast to low molar mass diblock copolymers (N¯b<100) with the same conformational asymmetry. A universal self-concentration crossover parameter N¯x400 is identified, directly related to the crossover to entanglement dynamics in polymer melts. Mean-field behavior is recovered when N¯b>N¯x, while complex low symmetry phase formation is attributed to fluctuations and space-filling constraints, which dominate when N¯b<N¯x.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 14 May 2018
  • Revised 6 September 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.208002

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Polymers & Soft Matter

Authors & Affiliations

Ronald M. Lewis, III1, Akash Arora1, Haley K. Beech1, Bongjoon Lee1, Aaron P. Lindsay1, Timothy P. Lodge1,2, Kevin D. Dorfman1, and Frank S. Bates1,*

  • 1Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA
  • 2Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA

  • *To whom correspondence should be addressed. bates001@umn.edu

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 121, Iss. 20 — 16 November 2018

Reuse & Permissions
Access Options
CHORUS

Article Available via CHORUS

Download Accepted Manuscript
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×