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

The phase behavior of poly(styrene)-b-poly(1,4-butadiene) diblock copolymers with a polymer block invariant degree of polymerization N[over ¯]_{b}≈800 shows no evidence of Frank-Kasper phases, in contrast to low molar mass diblock copolymers (N[over ¯]_{b}N[over ¯]_{x}, while complex low symmetry ph...

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Bibliographic Details
Published in:Physical review letters 2018-11, Vol.121 (20), p.208002-208002, Article 208002
Main Authors: Lewis, Ronald M, Arora, Akash, Beech, Haley K, Lee, Bongjoon, Lindsay, Aaron P, Lodge, Timothy P, Dorfman, Kevin D, Bates, Frank S
Format: Article
Language:English
Subjects:
Asymmetry
Block copolymers
Butadiene
Crossovers
Degree of polymerization
Entanglement
Melts
Parameter identification
Polymer melts
Polystyrene resins
Variation
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Summary:The phase behavior of poly(styrene)-b-poly(1,4-butadiene) diblock copolymers with a polymer block invariant degree of polymerization N[over ¯]_{b}≈800 shows no evidence of Frank-Kasper phases, in contrast to low molar mass diblock copolymers (N[over ¯]_{b}N[over ¯]_{x}, while complex low symmetry phase formation is attributed to fluctuations and space-filling constraints, which dominate when N[over ¯]_{b}
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.121.208002