Formation of superlattices via blending of block copolymers

Abetz, Volker; Goldacker, Thorsten

doi:10.1002/(sici)1521-3927(20000101)21:1<16::aid-marc16>3.0.co;2-s

Cited by 191 publications

(195 citation statements)

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“…Synthesis and morphology of the SBV* miktoarm star terpolymers [9], the SB diblock copolymer [11], and the SV and VC diblock copolymers have been reported elsewhere [16]. The molecular characteristics and the morphologies are given in Tab.…”

Section: Experimental Partmentioning

confidence: 99%

“…Investigations have been carried out on the morphologies, both for linear systems like AB block copolymers [4], ABC triblock terpolymers [5,6], or ABCD tetrablock quaterpolymers [7], as well as on other systems with non-linear topologies like AB miktoarm copolymers [8], or ABC miktoarm star terpolymers [9]. Also blending of linear block copolymers as another strategy to control morphology was used successfully [10,11]. In such systems new morphologies were found, like a non-centrosymmetric lamellar superstructure in a blend of an ABC block terpolymer and AC block copolymer [12,13], or superstructures of centrosymmetric lamellae [13].…”

Section: Introductionmentioning

confidence: 99%

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Formation of superlattices in blends of 3-miktoarm star terpolymers with diblock copolymers

Abetz

Jiang

2004

E-Polymers

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In this contribution we report on the morphological structures formed in blends of microphase-separated 3-miktoarm star terpolymers of polystyrene-armpolybutadiene-arm-poly(2-vinylpyridine) (SBV*) and polystyrene-block-polybutadiene (SB), polystyrene-block-poly(2-vinylpyridine) (SV), poly(2-vinylpyridine)-block-poly(cyclohexyl methacrylate) (VC) diblock copolymers. The morphologies are characterized by transmission electron microscopy. Blends with similar morphologies as known from linear triblock terpolymers are found, like core-shell structures based on cylinders or gyroids. Other blends show very distorted morphologies, or morphologies similar to the ones found for pure 3-miktoarm star terpolymers. While attractive interactions between blocks of the two species enhance the formation of common superlattices, blends with too large diblock copolymers tend to macrophase-separate.

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Section: Experimental Partmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Formation of superlattices in blends of 3-miktoarm star terpolymers with diblock copolymers

Abetz

Jiang

2004

E-Polymers

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“…Multistep control of the precise composition of each segment of such A-B-C triblock copolymers, combined with the intricacies of controlling their thin-film morphologies, prompted our investigation into a simplified, modular approach to defining nanoscale features in polymeric thin films. In terms of modularity, simple blending of different diblock copolymers, such as A-B/B-C and A-B/C-D alloys, would seem to be attractive for combining physical properties and broadening the processing window (15)(16)(17). However, uniform long-range order has not been achieved in thin-film blends of block copolymers (18) because of the overwhelming tendency of such mixtures to exhibit macrophase separation (19)(20)(21)(22).…”

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Evolution of Block Copolymer Lithography to Highly Ordered Square Arrays

Tang

Lennon

Fredrickson

et al. 2008

Science

603

570

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The manufacture of smaller, faster, more efficient microelectronic components is a major scientific and technological challenge, driven in part by a constant need for smaller lithographically defined features and patterns. Traditional self-assembling approaches based on block copolymer lithography spontaneously yield nanometer-sized hexagonal structures, but these features are not consistent with the industry-standard rectilinear coordinate system. We present a modular and hierarchical self-assembly strategy, combining supramolecular assembly of hydrogen-bonding units with controlled phase separation of diblock copolymers, for the generation of nanoscale square patterns. These square arrays will enable simplified addressability and circuit interconnection in integrated circuit manufacturing and nanotechnology.

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“…Two asymmetric triblock terpolymers (S 26 I 07 M 67 171 and I 37 S 42 M 21 95 , referred from now on as SIM and ISM) were synthesized by sequential anionic polymerization and constitute the raw materials for the preparation of nine binary blends. Their molecular characteristics are summarized in Table 1.…”

Section: Resultsmentioning

confidence: 99%

Four‐Phase Morphologies in Blends of ABC and BAC Triblock Terpolymers

Haenelt

Abetz

2017

Macro Chemistry & Physics

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considerably more complex compared to diblock copolymers due to an increased number of variables. Thus, the morphology of linear ABC triblock terpolymers is controlled mainly by three interaction parameters (χ AB , χ AC , χ BC ,) and two independent volume fractions (f A , f B , f C = 1 -f A -f B ), as well as the block sequence. Among the morphologies are lamellae, lamellae with spheres or cylinders, knitting pattern, spheres on sphere, alternating and core-shell double gyroids, cylinder in cylinder, undulated/perforated cylinder in cylinder, cylinder at cylinder, spheres on cylinder, helices on cylinder. [12][13][14][15][16][17][18] The helices on cylinder represents a special case in between these morphologies. On the one hand, it is rare because it can be achieved only in a rather narrow composition window, but what is even more peculiar, it is the self-assembly of a nonchiral block copolymer into a chiral structure. [19] In order to develop functional materials with special electrical, optical, or magnetic properties, multiblock copolymers are promising, because of their capability to self-assemble into complex ordered morphologies, with symmetries like crystalline structures known from low molecular weight inorganic salts. [20] Lee et al. [21,22] were the first to identify a Frank-Kasper σ phase, which is a large tetragonal unit cell with P4 2 /mnm symmetry and 30 spheres, [23,24] in linear block copolymers. From then on numerous studies about novel sphere-forming morphologies in AB diblock [25][26][27] copolymers and ABAC tetrablock terpolymers [28] have been published. Especially linear ABAC tetrablock terpolymers are promising for the investigation of new structures. [29] Chanpuriya et al. [30] have presented nine different spherical phases for tetrablock terpolymers.Controlling the morphology for a given block copolymer by changing the volume fractions of the corresponding blocks implies the synthesis of one block copolymer for each morphology. There are other, more readily available methods to achieve different morphologies starting from one block copolymer. One method implicates chemical postmodification, like complexation or hydrogenation. Bronstein et al. [31] have modified the polybutadiene block (PB) of a polystyreneblock-polybutadiene-block-poly(methyl methacrylate) (SBM) triblock terpolymer by complexation with transition metal complexes, like Fe-complex and Pd-complex. They were able to observe a change from a lamellar morphology before modification to a cylindrical or gyroid morphology after the Blends It is investigated how binary blends of two asymmetric triblock terpolymers with the same type of monomers but different block sequences (ABC, BAC) and different block lengths lead to three new ABAC tetrablock terpolymer like morphologies. This study ascribes the formation of four microphases to a parallel chain orientation during the blend process. Because of the resultant spatial superposition, the B-blocks of both block copolymers can mix into each other as well as both C-blocks, whereas bot...

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Formation of superlattices via blending of block copolymers

Abstract: Results and discussion Morphologies of binary block copolymers, i. e., block copolymers with two different monomersWe consider first the morphologies of AB diblock copolymers, since most of the investigations on blends of bin-Macromol. Rapid Commun. 21, No. 1

Cited by 191 publications

References 86 publications

Formation of superlattices in blends of 3-miktoarm star terpolymers with diblock copolymers

Formation of superlattices in blends of 3-miktoarm star terpolymers with diblock copolymers

Evolution of Block Copolymer Lithography to Highly Ordered Square Arrays

Four‐Phase Morphologies in Blends of ABC and BAC Triblock Terpolymers

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