Morphology and miscibility of miktoarm styrene-diene copolymers and terpolymers

Hadjichristidis, N.; Iatrou, Hermis; Behal, S. K.; Chludzinski, J.J.; Disko, M. M.; Garner, Richard T.; Liang, K. S.; Lohse, David J.; Milner, Scott T.

doi:10.1021/ma00073a042

Cited by 164 publications

(162 citation statements)

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“…However, the observation of a morphology predicted to occur in a higher volume fraction range is consistent with previous studies of miktoarm star morphology. 1,2,4 The effect of the junction point on morphological behavior may be probed more directly by considering miktoarm stars exhibiting lamellar morphologies. Figure 8 shows a plot of lamellar spacing for A n B n materials, where n is equal to 1 (linear diblock data from Hashimoto and coworkers 21 ), 2 (A 2 B 2 -3, and data from Foster and Quirk 6 ), and 8 (Vergina star data from our previous study 5 ).…”

Section: Resultsmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10] These nonlinear architectures have been demonstrated to allow control of morphology independent of the familiar composition windows in which linear diblocks form various structures. An approximate method has also been developed, which models complex graft copolymer architectures with multiple graft points in terms of corresponding block copolymers containing single junction points that are representative of the junction point effect on morphology in the more complex molecules.…”

Section: Introductionmentioning

confidence: 99%

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Morphological behavior of A2B2 star block copolymers

Beyer

Gido

Uhrig

et al. 1999

J. Polym. Sci. B Polym. Phys.

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A series of A2B2 four‐arm, miktoarm stars of polystyrene and polyisoprene have been synthesized. The morphological behavior of these materials has been characterized using TEM, SAXS, and SANS, and was found to agree in general with the predictions of Milner's theory for miktoarm star morphological behavior. One sample was found to exhibit a cylindrical morphology where lamellae were predicted; this behavior is similar to other discrepancies observed in previous studies of miktoarm star morphological behavior. A second sample, predicted to form a bicontinuous morphology, was found to exhibit hexagonally packed cylinders. The tetrafunctional junction point also results in an increase in spacing for the lamellar sample in this series over that of an AB diblock, but not as great as the increase previously observed for A8B8 16‐arm star materials. © 1999 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 37: 3392–3400, 1999

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Morphological behavior of A2B2 star block copolymers

Beyer

Gido

Uhrig

et al. 1999

J. Polym. Sci. B Polym. Phys.

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“…[26][27][28][29] Whereas the synthesis may be challenging, the introduction of architectural parameters adds further issues in controlling thin film structure. A third strategy that overcomes these issues is to blend simple diblock copolymers or homopolymers to give, for example, AB/CD, AB/BC, or AB/C systems.…”

Section: Introductionmentioning

confidence: 99%

Thin Film Morphology of Block Copolymer Blends with Tunable Supramolecular Interactions for Lithographic Applications

et al. 2010

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A modular and hierarchical self-assembly strategy using block copolymer blends (AB/B'C) with tunable supramolecular interactions is reported. By combining supramolecular assembly of hydrogenbonding units with controlled phase separation of diblock copolymers, highly ordered square arrays or hexagonal arrays of cylindrical domains were obtained for mixtures of poly(ethylene oxide)-b-poly(styrene-r-4-hydroxystyrene) (PEO-b-P(S-r-4HS)) and poly(styrene-r-4-vinylpyridine)-b-poly(methyl methacrylate) (P(S-r-4VP)-b-PMMA) diblock copolymers under solvent annealing with controlled high humidity. The fraction of the H-bonded phenolic and pyridyl units was shown to be critical for both the generation of longrange order and controlling the spatial arrangement of the cylindrical domains. Both low absolute numbers and a near-stoichiometric ratio of pyridyl-to-phenolic groups are needed to produce ordered square arrays with separated PEO and PMMA domains, whereas a low ratio of pyridyl-to-phenolic groups facilitated the formation of ordered hexagonal arrays with mixed PEO and PMMA domains. Self-consistent field theory simulations suggest that the effective Flory-Huggins parameters between the various blocks control the stability of the different packing structures in this system. The modularity and tunability of this supramolecular block copolymer blending approach is a unique and powerful strategy to fabricate diverse nanostructures for a variety of applications such as block copolymer lithography.

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“…The living anionic polymerization is an accomplished technique for synthesis of 3-miktoarm star terpolymers. [7][8][9][10] Focusing on which, the linking agent approach are applied broadly using chlorosilane 9,11 or 1,1-diphenylethylene derivatives. 3,12 However, the monomers suited for anionic polymerization are limited and polymerization conditions are strict.…”

Section: Introductionmentioning

confidence: 99%