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Equilibrium behavior of symmetric ABA triblock copolymer melts

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Matsen, M. W., Thompson, R. B.·1999·The Journal of Chemical Physics
DOI 10.1063/1.480006
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Abstract

Melts of ABA triblock copolymer molecules with identical end blocks are examined using self-consistent field theory (SCFT). Phase diagrams are calculated and compared with those of homologous AB diblock copolymers formed by snipping the triblocks in half. This creates additional end segments which decreases the degree of segregation. Consequently, triblock melts remain ordered to higher temperatures than their diblock counterparts. We also find that middle-block domains are easier to stretch than end-block domains. As a result, domain spacings are slightly larger, the complex phase regions are shifted towards smaller A-segment compositions, and the perforated-lamellar phase becomes more metastable in triblock melts as compared to diblock melts. Although triblock and diblock melts exhibit very similar phase behavior, their mechanical properties can differ substantially due to triblock copolymers that bridge between otherwise disconnected A domains. We evaluate the bridging fraction for lamellar, cylindrical, and spherical morphologies to be about 40%–45%, 60%–65%, and 75%–80%, respectively. These fractions only depend weakly on the degree of segregation and the copolymer composition.

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Metadata

Authors
Matsen, M. W., & Thompson, R. B.
Venue
The Journal of Chemical Physics
Publisher
AIP Publishing
Published
1999-10-15
Volume
111
Issue
15
Pages
7139-7146
ISSN
  • 0021-9606 (ISSN-L)
  • 1089-7690
DOI
10.1063/1.480006
OpenAlex
W2055144274
Cited by
456
References
1
FWCI
4.57
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Equilibrium behavior of symmetric ABA triblock copolymer melts. https://app.cochat.ai/papers/10.1063/1.480006
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Matsen, M. W., & Thompson, R. B. (1999). Equilibrium behavior of symmetric ABA triblock copolymer melts. The Journal of Chemical Physics. https://doi.org/10.1063/1.480006

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