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Title: Cornucopia of Nanoscale Ordered Phases in Sphere-Forming Tetrablock Terpolymers

Journal Article · · ACS Nano
 [1];  [1];  [1];  [2];  [1];  [1];  [3];  [3];  [1]
  1. Univ. of Minnesota, Minneapolis, MN (United States)
  2. Rensselaer Polytechnic Inst., Troy, NY (United States)
  3. Univ. of California, Santa Barbara, CA (United States)

In this paper, we report the phase behavior of a series of poly(styrene)-b-poly(isoprene)-b-poly(styrene)'-b-poly(ethylene oxide) (SIS'O) tetrablock terpolymers. This study was motivated by self-consistent field theory (SCFT) calculations that anticipate a rich array of sphere-forming morphologies with variations in the molecular symmetry parameter τ = NS/(NS + NS'), where N is the block degree of polymerization and the volume fraction of O is less than about 0.22. Eight SIS'O samples, with τ ranging from 0.21 to 0.73, were synthesized and investigated using small-angle X-ray scattering and transmission electron microscopy, yielding evidence of nine different spherical phases: hexagonal, FCC, HCP, BCC, rhombohedral (tentative), liquid-like packing, dodecagonal quasicrystal, and Frank–Kasper σ and A15 phases. At temperatures close to the order–disorder transition, these tetrablocks behave as pseudo-[SIS']-O diblocks and form equilibrium morphologies mediated by facile chain exchange between micelles. Transition from equilibrium to nonequilibrium behavior occurs at a temperature (Terg) several tens of degrees below the order–disorder transition temperature, speculated to be coincident with the loss of ergodicity, as chain exchange is arrested due to increased segregation strength between the core (O) and corona (SIS') blocks. Nonequilibrium ordered structures form when T < Terg; these are interpreted using SCFT calculations to elucidate the free energy landscape driving ordering in the S and I block matrix. These experiments demonstrate a profound dependence on phase stability with variations in τ and temperature, providing insights into the formation of ordered phase symmetry in this class of asymmetric multiblock polymers.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
National Science Foundation (NSF); E.I. DuPont de Nemours & Co.; The Dow Chemical Company; Northwestern University; USDOE Office of Science (SC)
Grant/Contract Number:
DMR-1333669; DMR-1332842; AC02-06CH11357
OSTI ID:
1255285
Journal Information:
ACS Nano, Vol. 10, Issue 5; ISSN 1936-0851
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 86 works
Citation information provided by
Web of Science

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Cited By (21)

One-Pot Synthesis of ABCDE Multiblock Copolymers with Hydrophobic, Hydrophilic, and Semi-Fluorinated Segments journal October 2017
An Exceptionally Stable and Scalable Sugar–Polyolefin Frank–Kasper A15 Phase journal December 2019
Small‐Molecule Modulation of Soft‐Matter Frank–Kasper Phases: A Method for Adding Function to Form journal January 2020
An Exceptionally Stable and Scalable Sugar–Polyolefin Frank–Kasper A15 Phase journal January 2020
Small‐Molecule Modulation of Soft‐Matter Frank–Kasper Phases: A Method for Adding Function to Form journal January 2020
Self‐Assembly of Multiblock Copolymers journal June 2019
Four-Phase Morphologies in Blends of ABC and BAC Triblock Terpolymers journal July 2017
Frank–Kasper Phases Identified in PDMS‐ b ‐PTFEA Copolymers with High Conformational Asymmetry journal July 2019
Frank-Kasper and related quasicrystal spherical phases in macromolecules journal December 2017
Metallic-mean quasicrystals as aperiodic approximants of periodic crystals journal September 2019
New frontiers for the materials genome initiative journal April 2019
Losing supramolecular orientational memory via self-organization of a misfolded secondary structure journal January 2018
Structure formation in soft nanocolloids: liquid-drop model journal January 2018
Thermodynamics of 3D diamond-like epitaxial (film) morphologies on 1D modulated substrate: Weak crystallization theory journal June 2019
Multiple-scale structures: from Faraday waves to soft-matter quasicrystals journal March 2018
Multiple-scale structures: from Faraday waves to soft-matter quasicrystals conference January 2018
One-Pot Synthesis of ABCDE Multiblock Copolymers with Hydrophobic, Hydrophilic, and Semi-Fluorinated Segments journal October 2017
Multiple-scale structures: from Faraday waves to soft-matter quasicrystals text January 2017
Path-Dependent Preparation of Complex Micelle Packings of a Hydrated Diblock Oligomer journal February 2019
Stable Frank–Kasper phases of self-assembled, soft matter spheres journal September 2018
Encoding biological recognition in a bicomponent cell-membrane mimic text January 2019

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