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Dair, Benita J.; Avgeropoulos, Apostolos; Hadjichristidis, N.; Thomas, Edwin L.

doi:10.1023/a:1004816723095

Cited by 45 publications

(52 citation statements)

References 24 publications

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“…However, depending on the molecular architecture and resulting morphology of the block copolymers, the phase separated structures might have a different extent of orientation. It is known that the tensile yield stress of the block copolymers is strongly influenced by the orientation of the microdomains 8, 9, 25, 26…”

Section: Resultssupporting

confidence: 84%

Microhardness of styrene/butadiene block copolymer systems: Influence of molecular architecture

Michler

Calleja

Puente

et al. 2003

J of Applied Polymer Sci

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ABSTRACT:The influence of molecular architecture on the mechanical properties of styrene/butadiene block copolymers was investigated by means of the microhardness technique. It was found that the microhardness of the styrene/butadiene block copolymers is dictated by the nature of microphase separated morphology. In contrast to polymer blends and random copolymers, in which the microhardness generally follows the additivity rule, the behavior of the investigated block copolymers was found to significantly deviate depending on their molecular architecture.The glass-transition temperature of the polystyrene phase (T g-PS ), which practically remained constant and that of the polybutadiene phase (T g-PB ), which varied with the change in the block copolymer architecture, apparently do not influence the microhardness values of the block copolymers.

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Section: Resultssupporting

confidence: 84%

Microhardness of styrene/butadiene block copolymer systems: Influence of molecular architecture

Michler

Calleja

Puente

et al. 2003

J of Applied Polymer Sci

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“…Figure 3 shows that both E and σ y showed a strong increase at the transition from the hexagonal morphology to the bicontinuous morphology. The bicontinuous morphology was known to possess larger E and σ y values than the lamellar morphology, in agreement with studies of Thomas and coworkers 18. For the LN3/LN4 blends, E showed a maximum in the bicontinuous composition range, obviously increasing despite a weight fraction of the elastomeric triblock copolymer LN4 of about 20 wt %, which usually resulted in a decreasing value of E .…”

Section: Resultssupporting

confidence: 89%

“…With increasing LN4 content, the yield point diminished because of the transition from the bicontinuous morphology to the hexagonal morphology at about 35 wt % LN4; this assigned the transition from thermoplastic to elastomeric properties, and the elastomeric property profile was extended up to a thermoplastic concentration of 65%. Bicontinuous structures such as gyroids are obviously capable of providing improved properties in comparison with other morphologies, as observed by Thomas and coworkers earlier,18 apparently strengthening the thermoplastic property profile of a material because of the absence of a continuous rubbery matrix; however, the changes in the properties with 35 wt % TPE (LN4) arose from the presence of a rubbery SB matrix in the hexagonal cylindrical morphology.…”

Section: Resultsmentioning

confidence: 58%

Morphology and mechanical properties of binary triblock copolymer blends

Lach

Weidisch

Knoll

2005

J Polym Sci B Polym Phys

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The influence of the morphology on the mechanical properties of binary styrene–butadiene (SB) triblock copolymer blends of a thermoplastic block copolymer and a thermoplastic elastomer (TPE) with different molecular architectures was studied with bulk samples prepared from toluene. Both block copolymers contained SB random copolymer middle blocks, that is, the block sequence S–SB–S. The two miscible triblock copolymers were combined to create a TPE with increased tensile strength without a change in their elasticity. The changes in the equilibrium morphology of the miscible triblock copolymer blends as a function of the TPE content (lamellae, bicontinuous morphology, hexagonal cylinders, and worms) resulted in a novel morphology–property correlation: (1) the strain at break and Young's modulus of blends with about 20 wt % TPE were larger than those of the pure thermoplastic triblock copolymer; (2) at the transition from bicontinuous structures to hexagonal structures (∼35 wt % TPE), a change in the mechanical properties from thermoplastic to elastomeric was observed; and (3) in the full range of wormlike and hexagonal morphology (60–100 wt % TPE), elastomeric properties were observed, the strength greatly increasing and high‐strength elastomers resulting. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 429–438, 2005

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“…The microdomains can be enlarged either by suppressing the nucleation density of the equilibrium morphology (e.g. [ 33,121,122 ] Two related and particularly promising techniques which have led to the demonstration of excellent long range order and orientational control for other block copolymer equilibrium morphologies (e.g. Their orientation might also be affected by parameters such as the commensurability between the periodicity of the equilibrium morphology and the fi lm thickness, the surface energies of the substrate-polymer and polymer-air interfaces, and the roughness of the substrate.…”

Section: Reviewmentioning

confidence: 99%

Optical Properties of Gyroid Structured Materials: From Photonic Crystals to Metamaterials

Dolan

Wilts

Vignolini

et al. 2014

Advanced Optical Materials

230

224

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The gyroid is a continuous and triply periodic cubic morphology which possesses a constant mean curvature surface across a range of volumetric fi ll fractions. Found in a variety of natural and synthetic systems which form through self-assembly, from butterfl y wing scales to block copolymers, the gyroid also exhibits an inherent chirality not observed in any other similar morphologies. These unique geometrical properties impart to gyroid structured materials a host of interesting optical properties. Depending on the length scale on which the constituent materials are organised, these properties arise from starkly different physical mechanisms (such as a complete photonic bandgap for photonic crystals and a greatly depressed plasma frequency for optical metamaterials). This article reviews the theoretical predictions and experimental observations of the optical properties of two fundamental classes of gyroid structured materials: photonic crystals (wavelength scale) and metamaterials (sub-wavelength scale).

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Cited by 45 publications

References 24 publications

Microhardness of styrene/butadiene block copolymer systems: Influence of molecular architecture

Microhardness of styrene/butadiene block copolymer systems: Influence of molecular architecture

Morphology and mechanical properties of binary triblock copolymer blends

Optical Properties of Gyroid Structured Materials: From Photonic Crystals to Metamaterials

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