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Theoretical Study of Phase Behaviors of Symmetric Linear B(1)A(1)B(2)A(2)B(3) Pentablock Copolymer

The nanostructures that are self-assembled from block copolymer systems have attracted interest. Generally, it is believed that the dominating stable spherical phase is body-centered cubic (BCC) in linear AB-type block copolymer systems. The question of how to obtain spherical phases with other arra...

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Autores principales: Zhao, Bin, Dong, Qingshu, Yang, Wei, Xu, Yuci
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10146716/
https://www.ncbi.nlm.nih.gov/pubmed/37110770
http://dx.doi.org/10.3390/molecules28083536
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author Zhao, Bin
Dong, Qingshu
Yang, Wei
Xu, Yuci
author_facet Zhao, Bin
Dong, Qingshu
Yang, Wei
Xu, Yuci
author_sort Zhao, Bin
collection PubMed
description The nanostructures that are self-assembled from block copolymer systems have attracted interest. Generally, it is believed that the dominating stable spherical phase is body-centered cubic (BCC) in linear AB-type block copolymer systems. The question of how to obtain spherical phases with other arrangements, such as the face-centered cubic (FCC) phase, has become a very interesting scientific problem. In this work, the phase behaviors of a symmetric linear B(1)A(1)B(2)A(2)B(3) (f(A1) = f(A2), f(B1) = f(B3)) pentablock copolymer are studied using the self-consistent field theory (SCFT), from which the influence of the relative length of the bridging B(2)-block on the formation of ordered nanostructures is revealed. By calculating the free energy of the candidate ordered phases, we determine that the stability regime of the BCC phase can be replaced by the FCC phase completely by tuning the length ratio of the middle bridging B(2)-block, demonstrating the key role of B(2)-block in stabilizing the spherical packing phase. More interestingly, the unusual phase transitions between the BCC and FCC spherical phases, i.e., BCC → FCC → BCC → FCC → BCC, are observed as the length of the bridging B(2)-block increases. Even though the topology of the phase diagrams is less affected, the phase windows of the several ordered nanostructures are dramatically changed. Specifically, the changing of the bridging B(2)-block can significantly adjust the asymmetrical phase regime of the Fddd network phase.
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spelling pubmed-101467162023-04-29 Theoretical Study of Phase Behaviors of Symmetric Linear B(1)A(1)B(2)A(2)B(3) Pentablock Copolymer Zhao, Bin Dong, Qingshu Yang, Wei Xu, Yuci Molecules Article The nanostructures that are self-assembled from block copolymer systems have attracted interest. Generally, it is believed that the dominating stable spherical phase is body-centered cubic (BCC) in linear AB-type block copolymer systems. The question of how to obtain spherical phases with other arrangements, such as the face-centered cubic (FCC) phase, has become a very interesting scientific problem. In this work, the phase behaviors of a symmetric linear B(1)A(1)B(2)A(2)B(3) (f(A1) = f(A2), f(B1) = f(B3)) pentablock copolymer are studied using the self-consistent field theory (SCFT), from which the influence of the relative length of the bridging B(2)-block on the formation of ordered nanostructures is revealed. By calculating the free energy of the candidate ordered phases, we determine that the stability regime of the BCC phase can be replaced by the FCC phase completely by tuning the length ratio of the middle bridging B(2)-block, demonstrating the key role of B(2)-block in stabilizing the spherical packing phase. More interestingly, the unusual phase transitions between the BCC and FCC spherical phases, i.e., BCC → FCC → BCC → FCC → BCC, are observed as the length of the bridging B(2)-block increases. Even though the topology of the phase diagrams is less affected, the phase windows of the several ordered nanostructures are dramatically changed. Specifically, the changing of the bridging B(2)-block can significantly adjust the asymmetrical phase regime of the Fddd network phase. MDPI 2023-04-17 /pmc/articles/PMC10146716/ /pubmed/37110770 http://dx.doi.org/10.3390/molecules28083536 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zhao, Bin
Dong, Qingshu
Yang, Wei
Xu, Yuci
Theoretical Study of Phase Behaviors of Symmetric Linear B(1)A(1)B(2)A(2)B(3) Pentablock Copolymer
title Theoretical Study of Phase Behaviors of Symmetric Linear B(1)A(1)B(2)A(2)B(3) Pentablock Copolymer
title_full Theoretical Study of Phase Behaviors of Symmetric Linear B(1)A(1)B(2)A(2)B(3) Pentablock Copolymer
title_fullStr Theoretical Study of Phase Behaviors of Symmetric Linear B(1)A(1)B(2)A(2)B(3) Pentablock Copolymer
title_full_unstemmed Theoretical Study of Phase Behaviors of Symmetric Linear B(1)A(1)B(2)A(2)B(3) Pentablock Copolymer
title_short Theoretical Study of Phase Behaviors of Symmetric Linear B(1)A(1)B(2)A(2)B(3) Pentablock Copolymer
title_sort theoretical study of phase behaviors of symmetric linear b(1)a(1)b(2)a(2)b(3) pentablock copolymer
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10146716/
https://www.ncbi.nlm.nih.gov/pubmed/37110770
http://dx.doi.org/10.3390/molecules28083536
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