Volume 56, Issue 22 pp. 1491-1504
Full Paper

On the morphological behavior of ABC miktoarm stars containing poly(cis 1,4-isoprene), poly(styrene), and poly(2-vinylpyridine)

Sergey Chernyy

Corresponding Author

Sergey Chernyy

Technical University of Denmark, DTU Nanotech, Produktionstorvet, 2800 Lyngby, Denmark

Correspondence to: S. Chernyy (E-mail: [email protected]); J. P. Mahalik (E-mail: [email protected])Search for more papers by this author
Jyoti P. Mahalik

Corresponding Author

Jyoti P. Mahalik

Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831

Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831

Correspondence to: S. Chernyy (E-mail: [email protected]); J. P. Mahalik (E-mail: [email protected])Search for more papers by this author
Rajeev Kumar

Rajeev Kumar

Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831

Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831

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Jacob Judas Kain Kirkensgaard

Jacob Judas Kain Kirkensgaard

Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark

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Matthias M. L. Arras

Matthias M. L. Arras

Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831

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Hyeyoung Kim

Hyeyoung Kim

Polymer Science and Engineering Department, University of Massachusetts Amherst, 120 Governors Drive, Amherst, Massachusetts 01003

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Lars Schulte

Lars Schulte

Technical University of Denmark, DTU Nanotech, Produktionstorvet, 2800 Lyngby, Denmark

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Sokol Ndoni

Sokol Ndoni

Technical University of Denmark, DTU Nanotech, Produktionstorvet, 2800 Lyngby, Denmark

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Gregory S. Smith

Gregory S. Smith

Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831

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Kell Mortensen

Kell Mortensen

Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark

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Bobby G. Sumpter

Bobby G. Sumpter

Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831

Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831

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Thomas P. Russell

Thomas P. Russell

Polymer Science and Engineering Department, University of Massachusetts Amherst, 120 Governors Drive, Amherst, Massachusetts 01003

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Kristoffer Almdal

Kristoffer Almdal

Technical University of Denmark, DTU Nanotech, Produktionstorvet, 2800 Lyngby, Denmark

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First published: 03 October 2018
Citations: 6

ABSTRACT

Fundamental understanding of microphase separation in ABC miktoarm copolymers is vital to access a plethora of nonconventional morphologies. Miktoarm stars based on poly(cis 1,4-isoprene) (I), poly(styrene) (S), and poly(2-vinylpyridine) (V) are model systems, which allow systematic studies of the effects of composition, chemical microstructure, and temperature on the thermodynamics of microphase separation. Eleven ISV-x (I:S:V = 1:1:x, v:v:v) miktoarm copolymers were synthesized by anionic polymerization affording well-defined copolymers with a variable V arm. Equilibrium bulk morphologies of all samples, as evidenced by small-angle X-ray scattering, transmission electron microscopy (TEM), and self-consistent field theory, showed a systematic transition from lamellae (x ≈ 0–0.2) to [8.8.4] tiling (x ≈ 0.6–0.9) to cylinders in undulating lamellae (x ≈ 2–4) and, finally, to hexagonally packed core–shell cylinders (x ≈ 5–8). Chemical microstructure of the I arm [poly(cis 1,4-isoprene)] versus poly(3,4-isoprene) is shown to play important role in affecting morphological behavior. To reconcile differences between ISV-x star morphologies reported in the literature and those reported herein, even for the same composition, effects of the microstructure of I arm on the Flory–Huggins parameter between I and V arms were taken into account in a qualitative manner. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018, 56, 1491–1504

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