Journal
PHYSICAL REVIEW LETTERS
Volume 121, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.208002
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Funding
- National Science Foundation [0960140, DMR-1104368, DMR-1725272]
- National Science Foundation Graduate Research Fellowship [00039202]
- Dow Chemical Company
- Northwestern University
- U.S. DOE [DE-AC02-06CH11357]
- NSF through the MRSEC program
- E. I. DuPont de Nemours Co.
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The phase behavior of poly(styrene)-b-poly(1,4-butadiene) diblock copolymers with a polymer block invariant degree of polymerization (N) over bar (b) approximate to 800 shows no evidence of Frank-Kasper phases, in contrast to low molar mass diblock copolymers ((N) over bar (b) < 100) with the same conformational asymmetry. A universal self-concentration crossover parameter <(N)over bar>(x) approximate to 400 is identified, directly related to the crossover to entanglement dynamics in polymer melts. Mean-field behavior is recovered when (N) over bar (b) > (N) over bar (x), while complex low symmetry phase formation is attributed to fluctuations and space-filling constraints, which dominate when (N) over bar (b) < <(N)over bar>(x).
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