Extreme Deflection of Phase Boundaries and Chain Bridging in A(BA')n Miktoarm Star Polymers
Abstract
In this study, we use self-consistent field theory to demonstrate that the A(BA')n miktoarm architecture can strongly deflect order–order phase boundaries to large volume fractions fA. The A(BA')n architecture achieves this strong deflection by combining the effects of miktoarm frustration and block bidispersity and is shown to stabilize discrete spheres and cylinders of the A block up to values of $$f_A$$ = 0.58 and $$f_A$$ = 0.78, respectively. Next, we analyze the prevalence of chain bridging $$ν_B$$ in both neat miktoarm melts and in homopolymer blends that form the fluctuation-stabilized “bricks and mortar” phase. These calculations demonstrate that high $$ν_B$$ and $$f_A$$ can both be simultaneously achieved with highly asymmetric miktoarm stars, a property especially useful for the design of tough thermoplastic elastomers. Lastly, we show that these miktoarms exhibit large windows of phase space where the σ and A15 Frank–Kasper phases are stable.
- Authors:
-
- Univ. of California, Santa Barbara, CA (United States)
- Publication Date:
- Research Org.:
- Univ. of California, Santa Barbara, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1594760
- Grant/Contract Number:
- SC0019001; CNS-1725797; DMR-1720256
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Macromolecules
- Additional Journal Information:
- Journal Volume: 53; Journal Issue: 2; Journal ID: ISSN 0024-9297
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Morphology; Interfaces; Homopolymers; Mathematical methods; Phase transitions
Citation Formats
Lequieu, Joshua, Koeper, Trenton, Delaney, Kris T., and Fredrickson, Glenn H. Extreme Deflection of Phase Boundaries and Chain Bridging in A(BA')n Miktoarm Star Polymers. United States: N. p., 2020.
Web. doi:10.1021/acs.macromol.9b02254.
Lequieu, Joshua, Koeper, Trenton, Delaney, Kris T., & Fredrickson, Glenn H. Extreme Deflection of Phase Boundaries and Chain Bridging in A(BA')n Miktoarm Star Polymers. United States. https://doi.org/10.1021/acs.macromol.9b02254
Lequieu, Joshua, Koeper, Trenton, Delaney, Kris T., and Fredrickson, Glenn H. Wed .
"Extreme Deflection of Phase Boundaries and Chain Bridging in A(BA')n Miktoarm Star Polymers". United States. https://doi.org/10.1021/acs.macromol.9b02254. https://www.osti.gov/servlets/purl/1594760.
@article{osti_1594760,
title = {Extreme Deflection of Phase Boundaries and Chain Bridging in A(BA')n Miktoarm Star Polymers},
author = {Lequieu, Joshua and Koeper, Trenton and Delaney, Kris T. and Fredrickson, Glenn H.},
abstractNote = {In this study, we use self-consistent field theory to demonstrate that the A(BA')n miktoarm architecture can strongly deflect order–order phase boundaries to large volume fractions fA. The A(BA')n architecture achieves this strong deflection by combining the effects of miktoarm frustration and block bidispersity and is shown to stabilize discrete spheres and cylinders of the A block up to values of $f_A$ = 0.58 and $f_A$ = 0.78, respectively. Next, we analyze the prevalence of chain bridging $ν_B$ in both neat miktoarm melts and in homopolymer blends that form the fluctuation-stabilized “bricks and mortar” phase. These calculations demonstrate that high $ν_B$ and $f_A$ can both be simultaneously achieved with highly asymmetric miktoarm stars, a property especially useful for the design of tough thermoplastic elastomers. Lastly, we show that these miktoarms exhibit large windows of phase space where the σ and A15 Frank–Kasper phases are stable.},
doi = {10.1021/acs.macromol.9b02254},
journal = {Macromolecules},
number = 2,
volume = 53,
place = {United States},
year = {Wed Jan 08 00:00:00 EST 2020},
month = {Wed Jan 08 00:00:00 EST 2020}
}
Web of Science
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