Gyroid Structures and Morphological Control in Binary Blends of Polystyrene-<i>block</i>-polyisoprene Diblock Copolymers

Sakurai, Shinichi; Irie, Hiroshi; Umeda, Hideo; Nomura, Shunji; Lee, Hee Hyun; Kim, Jin Kon

doi:10.1021/ma970471e

Cited by 72 publications

(78 citation statements)

References 33 publications

(108 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the future, it will be interesting to explore the feasibility of using an asymmetric DBC additive but of a composition chosen to alleviate packing frustration in both of the domains; depending on the length and composition of such an additive, it could stabilize a gyroid phase over a broader range of conditions and at overall A-block volume fractions that may be lower or higher than those where it is observed in pure DBCs. 32 An intriguing finding in this work is the appearance of a metastable woodpile phase. Although its free energy was found to be within error bars of the cylindrical phase, the woodpile phase transforms to a cylinder phase when the box size is doubled in each dimension.…”

Section: Discussionmentioning

confidence: 79%

A theoretical and simulation study of the self-assembly of a binary blend of diblock copolymers

Padmanabhan

Martínez-Veracoechea

Araque

et al. 2012

The Journal of Chemical Physics

View full text Add to dashboard Cite

Pure diblock copolymer melts exhibit a narrow range of conditions at which bicontinuous and cocontinuous phases are stable; such conditions and the morphology of such phases can be tuned by the use of additives. In this work, we have studied a bidisperse system of diblock copolymers using theory and simulation. In particular, we elucidated how a short, lamellar-forming diblock copolymer modifies the phase behavior of a longer, cylinder-forming diblock copolymer. In a narrow range of intermediate compositions, self-consistent field theory predicts the formation of a gyroid phase although particle-based simulations show that three phases compete: the gyroid phase, a disordered cocontinuous phase, and the cylinder phase, all having free energies within error bars of each other. Former experimental studies of a similar system have yielded an unidentified, partially irregular bicontinuous phase, and our simulations suggest that at such conditions the formation of a partially transformed network phase is indeed plausible. Close examination of the spatial distribution of chains reveals that packing frustration (manifested by chain stretching and low density spots) occurs in the majority-block domains of the three competing phases simulated. In all cases, a double interface around the minority-block domains is also detected with the outer one formed by the short chains, and the inner one formed by the longer chains.

show abstract

Section: Discussionmentioning

confidence: 79%

A theoretical and simulation study of the self-assembly of a binary blend of diblock copolymers

Padmanabhan

Martínez-Veracoechea

Araque

et al. 2012

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

“…Many works were devoted to blends of binary block copolymers. [1][2][3][4][5][6] When blending linear triblock terpolymers with diblock copolymers, besides similar morphologies known for pure triblock and diblock copolymers, there are also some new morphologies. A few examples of such systems have been reported elsewhere.…”

Section: Introductionmentioning

confidence: 99%

Novel Superlattices via Blending of Asymmetric Triblock Terpolymers with Diblock Copolymers

Jiang

Göpfert

Abetz

2003

Macromol. Rapid Commun.

View full text Add to dashboard Cite

The formation of superlattices in blends of a series of asymmetric BSV triblock terpolymers and symmetric SV or VC diblock copolymers is investigated with S being polystyrene, B being poly(1,2‐butadiene), V being poly(2‐vinylpyridine), and C being poly(cyclohexyl methacrylate). All of these triblock terpolymers and diblock copolymers by themselves self‐assemble into lamellae. Apart from various core shell morphologies, in these blends some new unexpected superstructures were obtained.A TEM micrograph of a 50/50 blend of B30S58V with S45V.magnified imageA TEM micrograph of a 50/50 blend of B30S58V with S45V.

show abstract

“…1,2 Recently, the blends of two different block copolymers, such as (A-B) R /(A-B) where A-B denotes A-block-B copolymer, also have received considerable theoretical [3][4][5][6][7][8][9] and experimental 10-29 attention due to their richness of the phase behaviors, including macrophase separation, 8,9,[13][14][15]23,27 microphase separation, 10,11,[16][17][18][19][20][21][22][23][24][25][26]29 macrophase separation induced by microphase separation, 14 OOT,4,5,[19][20][21]24,26 and modulated or superlattice structures. 15 In the previous study, 30 we investigated the interplay of macro-and microphase transitions by employing binary mixtures of polystyrene (PS)-block-polyisoprene (PI) (PS-PI) diblock copolymers which have similar molecular weights but different compositions, namely, the volume fractions of PS-block (f PS ).…”

Section: Introductionmentioning

confidence: 99%

A Phase Diagram for the Binary Blends of Nearly Symmetric Diblock Copolymers. 2. Parameter Space of Temperature and Blend Composition

2001

View full text Add to dashboard Cite

A phase diagram in the parameter space of temperature and blend composition that contains order-disorder transition (ODT) and thermoreversible macrophase separation between constituent copolymers was constructed for binary blends of polystyrene-block-polyisoprene (PS-PI) copolymers. The constituent copolymers, designated as H102 and FS-1, have nearly symmetric copolymer compositions and rather different molecular weights; i.e., number-average molecular weight (M n) and volume fraction of PS-block (fPS) are 1.0 × 10 5 and 0.47 for H102 while 2.1 × 10 4 and 0.40 for FS-1. The ODT was observed on the neat FS-1 and two blend specimens whose weight fractions of H102, ΦH102, are 0.1 and 0.2. Counterintuitively, the ODT temperature (TODT) decreased with increasing the average molecular weight of the specimen, namely, TODT for FS-1 neat > TODT for the blend of ΦH102 ) 0.1 > TODT for the blend of ΦH102 ) 0.2. Then TODT abruptly increased between the blends of ΦH102 ) 0.2 and 0.3 and became inaccessibly high temperature (i.e., > 200°C). The macrophase separation between H102 and FS-1 was observed on the blend of ΦH102 ) 0.2. This macrophase separation was thermoreversible but accompanied by a hysteresis between cooling and heating processes. Although both H102 and FS-1 neat copolymers showed lamellar morphology, PS cylindrical morphology was observed on certain blend specimens. The origin of PS cylindrical morphology may be attributed to the slight asymmetry in the fPS of FS-1.

show abstract

Gyroid Structures and Morphological Control in Binary Blends of Polystyrene-block-polyisoprene Diblock Copolymers

Cited by 72 publications

References 33 publications

A theoretical and simulation study of the self-assembly of a binary blend of diblock copolymers

A theoretical and simulation study of the self-assembly of a binary blend of diblock copolymers

Novel Superlattices via Blending of Asymmetric Triblock Terpolymers with Diblock Copolymers

A Phase Diagram for the Binary Blends of Nearly Symmetric Diblock Copolymers. 2. Parameter Space of Temperature and Blend Composition

Contact Info

Product

Resources

About