Gyroid-Forming Diblock Copolymers Confined in Cylindrical Geometry: A Case of Extreme Makeover for Domain Morphology

Ma, Minglin; Thomas, Edwin L.; Rutledge, Gregory C.; Yu, Bin; Li, Baohui; Jin, Qinhan; Ding, Datong; Shi, An‐Chang

doi:10.1021/ma9022586

Cited by 62 publications

(67 citation statements)

References 59 publications

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“…Ruotsalainen et al observed lamellar-within-spherical structures for a poly(styrene-b-vinylpyridine) system [119]. Rutledge et al prepared electrospun block copolymers using a co-annular needle system, with the copolymer confined within a shell with a high glass transition temperature [120,121]. The shell served as a process aid for the core material during electrospinning, poly(styrene-b-isoprene-b-styrene), and also confined the copolymer during the subsequent annealing step [120].…”

Section: Fibers Formed From Block Copolymersmentioning

confidence: 99%

“…The shell served as a process aid for the core material during electrospinning, poly(styrene-b-isoprene-b-styrene), and also confined the copolymer during the subsequent annealing step [120]. Gyroid-type structures were formed when the block copolymer poly(styrene-b-dimethyl siloxane) was used with a poly(methacrylic acid) shell [121]. Ma et al reported the formation of superhydrophobic fibers by the electrospinning poly(styrene-b-dimethylsiloxane).…”

Section: Fibers Formed From Block Copolymersmentioning

confidence: 99%

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Hierarchically Structured Electrospun Fibers

Zander

2013

Polymers

125

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Abstract:Traditional electrospun nanofibers have a myriad of applications ranging from scaffolds for tissue engineering to components of biosensors and energy harvesting devices. The generally smooth one-dimensional structure of the fibers has stood as a limitation to several interesting novel applications. Control of fiber diameter, porosity and collector geometry will be briefly discussed, as will more traditional methods for controlling fiber morphology and fiber mat architecture. The remainder of the review will focus on new techniques to prepare hierarchically structured fibers. Fibers with hierarchical primary structures-including helical, buckled, and beads-on-a-string fibers, as well as fibers with secondary structures, such as nanopores, nanopillars, nanorods, and internally structured fibers and their applications-will be discussed. These new materials with helical/buckled morphology are expected to possess unique optical and mechanical properties with possible applications for negative refractive index materials, highly stretchable/high-tensile-strength materials, and components in microelectromechanical devices. Core-shell type fibers enable a much wider variety of materials to be electrospun and are expected to be widely applied in the sensing, drug delivery/controlled release fields, and in the encapsulation of live cells for biological applications. Materials with a hierarchical secondary structure are expected to provide new superhydrophobic and self-cleaning materials.

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Section: Fibers Formed From Block Copolymersmentioning

confidence: 99%

Section: Fibers Formed From Block Copolymersmentioning

confidence: 99%

Hierarchically Structured Electrospun Fibers

Zander

2013

Polymers

125

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“…For cylindrical pores, experiments show that new morphologies including helical structures and concentric lamellae appear as the diameter of the cylindrical pore changes [5][6][7]. These observations have been verified by numerical simulations, which in turn have predicted structures not yet observed [40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58].…”

Section: Introductionmentioning

confidence: 90%

“…The theoretical/numerical approaches that have been used to study copolymers in cylindrical confinement include SCFT [40][41][42][43][44][45], DFT [46], MC [47][48][49][50][51][52][53], SA [30,[54][55][56][57], dissipative particle dynamics [58], coarse-grained molecular dynamics [59] and TDGL theory [60]. These studies have yielded detailed phase diagrams associated with the new morphologies and how these vary with pore diameter, chemical incompatibility and the block asymmetry [1].…”

Section: Introductionmentioning

confidence: 99%

Morphology of diblock copolymers in porous media

et al. 2014

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We study the self-assembly of a diblock copolymer melt confined within a porous medium with a prescribed regular twodimensional geometry using self-consistent field theory. We find that the morphology of the polymer sensitively depends on the characteristic length scales of the porous material and the polymer radius of gyration (R g ). When the pore size is much larger than R g , the polymer self-assembly is affected only locally close to the contact with the pore surface. However, when the size of the pores and the distance between them is comparable to the diblock characteristic length, novel morphologies appear and the polymer structure changes according to the constraints imposed by the porous material. We develop an interaction potential for the solid particle and copolymer, and show how this provides an understanding of the qualitative feature of the morphologies.

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“…Two-dimensional (2D) confinement in the form of cylindrical pores with curved surfaces presents a more tightly confined geometry than that of thin films, and 2D confinements have been demonstrated to provide rich, varied structures. The use of cylindrical nanotubes produces 2D confinement with varying diameters for diblock copolymers as-studied in theory [16][17][18], simulation [19][20][21][22][23][24][25], and experiments [26][27][28][29][30][31]. Previous studies have also shown that the combined effects of confinement and curvature significantly influence the morphologies of copolymers in self-assembled systems.…”

Section: Introductionmentioning

confidence: 99%

Phase Behavior of Copolymers Confined in Multi-Walled Nanotubes: Insights from Simulations

Zuo

Wang

et al. 2015

Polymers

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In this paper, the self-assembly process of diblock copolymers confined in multi-walled cylindrical nanotubes is systematically investigated using a molecular dynamics (MD) method. The dependence of resultant morphologies on the degree of confinement and on the interaction strength between nanotubes and copolymers is studied comprehensively. When the wall surfaces are not preferential, results indicate that geometric confinement significantly influences copolymer conformations. In addition, the thickness of the helical lamellar structure increases with interaction strength and confinement size. In cases where the nanotubes are strongly attracted to one copolymer block, the confinement effect weakens as geometric space increases. Findings explain the dependence of chain conformation on the degree of confinement and the strength of surface preferences.

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Gyroid-Forming Diblock Copolymers Confined in Cylindrical Geometry: A Case of Extreme Makeover for Domain Morphology

Abstract: The self-assembly of gyroid-forming diblock copolymers confined in cylindrical geometry is studied using a combination of computer simulations and experiments. The simulations, based on a system qualitatively representative of poly (styrene-b-isoprene)

Cited by 62 publications

References 59 publications

Hierarchically Structured Electrospun Fibers

Hierarchically Structured Electrospun Fibers

Morphology of diblock copolymers in porous media

Phase Behavior of Copolymers Confined in Multi-Walled Nanotubes: Insights from Simulations

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