Journal article
On the Morphological Behavior of ABC Miktoarm Stars Containing Poly(cis 1,4-isoprene), Poly(styrene), and Poly(2-vinylpyridine)
Department of Micro- and Nanotechnology, Technical University of Denmark1
Amphiphilic Polymers in Biological Sensing, Department of Micro- and Nanotechnology, Technical University of Denmark2
Oak Ridge National Laboratory3
University of Copenhagen4
University of Massachusetts5
Self-Organized Nanoporous Materials, Department of Micro- and Nanotechnology, Technical University of Denmark6
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 smallangle 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 inundulating 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.
Language: | English |
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Year: | 2018 |
Pages: | 1491-1504 |
ISSN: | 10990488 and 08876266 |
Types: | Journal article |
DOI: | 10.1002/polb.24733 |
ORCIDs: | Chernyy, Sergey , Ndoni, Sokol , Almdal, Kristoffer , 0000-0003-4448-4126 , 0000-0001-9494-3488 , 0000-0001-6265-0314 , 0000-0002-4714-9086 , 0000-0002-9854-1694 , 0000-0002-8998-9390 , 0000-0001-6341-0355 and 0000-0001-6384-5826 |