Stabilizing the Ordered Bicontinuous Double Diamond Structure of Diblock Copolymer by Configurational Regularity

2018 ◽  
Vol 51 (11) ◽  
pp. 4049-4058 ◽  
Author(s):  
Chih-Hsuan Lin ◽  
Takeshi Higuchi ◽  
Hsin-Lung Chen ◽  
Jing-Cherng Tsai ◽  
Hiroshi Jinnai ◽  
...  
Keyword(s):  
Diblock Copolymer ◽  
Diamond Structure ◽  
Double Diamond

The Ordered Bicontinuous Double Diamond Structure in Binary Blends of Diblock Copolymer and Homopolymer.

1989 ◽  
Vol 171 ◽  
Author(s):  
Karen I. Winey ◽  
Edwin L. Thomas
Keyword(s):  
Molecular Weight ◽  
Diblock Copolymer ◽  
Diblock Copolymers ◽  
Composition Range ◽  
Volume Fraction ◽  
Diamond Structure ◽  
Binary Blends ◽  
Resultant Effect ◽  
Strong Segregation ◽  
Double Diamond

ABSTRACTWe report the observation of the ordered bicontinuous double diamond (OBDD) structure in binary blends of poly(styrene-isoprene) diblock copolymer and homopolystyrene. The overall polystyrene volume fraction range is 64 - 67 PSvol% for the OBDD structure in binary blends of a lamellar diblock (SI 27/22) and a homopolymer (14.0 hPS). This composition range is approximately within the polystyrene volume fraction range established for pure diblock copolymers in the strong segregation regime having the OBDD structure. Ordered lamellae are observed at approximately 65 PSvol% when the homopolystyrene molecular weight is greater than the molecular weight of the polystyrene block of the copolymer. This observation is discussed in terms of the decreased degree of mixing between the homopolymer and the corresponding block and the resultant effect on the interfacial curvature.

Real-space evidence of the equilibrium ordered bicontinuous double diamond structure of a diblock copolymer

Soft Matter ◽  
2015 ◽  
Vol 11 (10) ◽  
pp. 1871-1876 ◽  
Author(s):  
C. Y. Chu ◽  
X. Jiang ◽  
H. Jinnai ◽  
R. Y. Pei ◽  
W. F. Lin ◽  
...  
Keyword(s):  
Diblock Copolymer ◽  
Electron Tomography ◽  
Real Space ◽  
Diamond Structure ◽  
Thermally Stable ◽  
Reversible Transition ◽  
Double Gyroid ◽  
Double Diamond

A thermally stable ordered bicontinuous double diamond (OBDD) structure in a stereoregular diblock copolymer has been revealed by electron tomography. The structure underwent a thermally reversible transition to double gyroid upon heating, accompanied by a reduction of domain spacing.

scholarly journals Correction: Real-space evidence of the equilibrium ordered bicontinuous double diamond structure of a diblock copolymer

Soft Matter ◽  
2015 ◽  
Vol 11 (20) ◽  
pp. 4142-4142 ◽  
Author(s):  
C. Y. Chu ◽  
X. Jiang ◽  
H. Jinnai ◽  
R. Y. Pei ◽  
W. F. Lin ◽  
...  
Keyword(s):  
Diblock Copolymer ◽  
Real Space ◽  
Diamond Structure ◽  
Double Diamond

Morphologies in Blends of Diblock Copolymer and Homopolymer: Morphology Diagrams and the Intermaterial Dividing Surface

1991 ◽  
Vol 248 ◽  
Author(s):  
Karen I. Winey
Keyword(s):  
Molecular Weight ◽  
Diblock Copolymer ◽  
Mean Curvature ◽  
Morphological Data ◽  
Copolymer Composition ◽  
Binary Blends ◽  
Morphological Transitions ◽  
The Mean ◽  
Dividing Surface ◽  
Double Diamond

AbstractBinary blends of diblock copolymer (AB) and homopolymer (hA) self assemble upon solvent evaporation into a great variety of microphase separated morphologies. The ordered lamellar, bicontinuous double diamond, cylindrical and spherical morphologies were observed by TEM and SAXS in our studies, as well as a range of micellar morphologies.The mean curvature (H) and the area per copolymer junction (σj), which characterize the intermaterial dividing surface, increased with increasing homopolymer concentration in the blend and/or with decreasing homopolymer molecular weight. These trends were generally obeyed both between and within ordered morphology types. The increase in H and σj was related to an increased degree of mixing between the homopolymer and the block of the copolymer.Two types of isothermal morphology diagrams were constructed to consolidate the extensive morphological data and to illustrate the general morphological transitions in AB/hA blends. The constant molecular weight morphology diagrams illustrated the interdependence of the copolymer composition and the homopolymer concentration. The constant copolymer composition diagrams emphasized the importance of the relative homopolymer molecular weight and the overall blend composition.

Unraveling the Self-Assembly of Heterocluster Janus Dumbbells into Hybrid Cubosomes with Internal Double-Diamond Structure

2018 ◽  
Vol 141 (2) ◽  
pp. 831-839 ◽  
Author(s):  
Hong-Kai Liu ◽  
Li-Jun Ren ◽  
Han Wu ◽  
Yong-Li Ma ◽  
Sven Richter ◽  
...  
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Diamond Structure ◽  
Double Diamond

Effect of long-range order on craze microstructure in deformed PS/PB block copolymers

1987 ◽  
Vol 45 ◽  
pp. 524-525
Author(s):  
Chris S. Henkee ◽  
Edwin L. Thomas
Keyword(s):  
Block Copolymers ◽  
Diblock Copolymers ◽  
Local Deformation ◽  
Long Range Order ◽  
Diamond Structure ◽  
Volume Percent ◽  
Craze Growth ◽  
Stage Process ◽  
Spherical Micelles ◽  
Double Diamond

The morphology present in block copolymers is determined by the volume percent of each of the components present. When the minority component ranges from 0-20 vol%, spherical micelles of the minority component are found. From 20-35 vol%, cylindrical microdomains are observed; at volume fractions slightly greater than this (35-38%), the ordered bicontinuous double diamond structure is observed. Finally from 38-≃60 vol%, regular alternating lamellae are found. It is now well known that for polystyrene-polybutadiene (PS/PB) diblock copolymers in which the PB is the minority component forming either spheres or cylinders, that deformation takes place via crazing. The mechanism for craze growth in these polymers appears to be a two stage process; the cavitation of the PB phase, followed by the drawing of the PS matrix into fibrils spanning the region of local deformation.

Ordered-bicontinuous-double-diamond structure in block copolymer/homopolymer blends

2015 ◽  
Vol 110 (4) ◽  
pp. 48003 ◽  
Author(s):  
Hideaki Takagi ◽  
Katsuhiro Yamamoto ◽  
Shigeru Okamoto
Keyword(s):  
Block Copolymer ◽  
Diamond Structure ◽  
Homopolymer Blends ◽  
Double Diamond

Recent morphological surprises in diblock copolymer systems

1994 ◽  
Vol 52 ◽  
pp. 438-439
Author(s):  
M. M. Disko ◽  
S. K. Behal ◽  
K. S. Liang ◽  
R. J. Roe ◽  
K. J. Jeon
Keyword(s):  
Diblock Copolymer ◽  
Diblock Copolymers ◽  
Volume Fraction ◽  
Thin Sections ◽  
Flexible Control ◽  
Molecular Weights ◽  
Interfacial Surfaces ◽  
Double Diamond ◽  
Selective Separations ◽  
Styrene Butadiene

Diblock copolymers form ordered interfacial surfaces that range from lamellae, to cylinders, to the ordered bicontinuous double diamond (OBDD) structure, and spheres on a cubic lattice as the size of one component is increased. Flexible control of these materials presents an opportunity for structural materials, adhesives and selective separations. Mixtures of diblock copolymers with homopolymers exhibit similar structures due to changes in the interfacial curvature that accompany "swelling" the like-component of the diblock with homopolymer. Ordering behavior in systems of this type depends on the elastic properties and molecular weights (MW's) of the polymers, annealing temperature and annealing time. We have examined the changes in morphology of a styrene-butadiene (SB) diblock copolymer mixed with homopolymer polystyrene (hS). Sample made by casting from toluene solution, annealing at 130°C for 2-10 days, staining B-rich regions with OsO4, and microtoming thin-sections at -90°C. The SB MW was 49 800 g/mol with an S-block MW of 25 500 g/mol, and 24 400 g/mol for the B-block. Two hS components were used, having MW's of 26 000 g/mol (h26) and 19 300 g/mol (h19). We refer to the samples by the hS molecular weight and total polystyrene volume fraction, e.g. h26/0.67.

A variety of morphologies in diblock copolymer/homopolymer blends

1989 ◽  
Vol 47 ◽  
pp. 346-347
Author(s):  
Edwin L. Thomas ◽  
Karen I. Winey
Keyword(s):  
Molecular Weight ◽  
Block Copolymer ◽  
Diblock Copolymer ◽  
Copolymer Composition ◽  
Molecular Weights ◽  
Copolymer Concentration ◽  
Wide Range ◽  
Homopolymer Blends ◽  
Long Range Ordering ◽  
Double Diamond

A wide range of morphologies and thereby physical properties can be achieved in block copolymer/homopolymer blends by varying the copolymer composition, copolymer concentration and molecular weights. Recently we investigated micelle shape transitions in diblock copolymer with homopolymer blends at low copolymer concentration. In this paper we study the microstructure over a wider concentration range for a polystyrene-polybutadiene (PS/PB) diblock copolymer of molecular weight 20.5 × 103/20.5 × 103 blended with 17.2 × 103 molecular weight homopolystyrene (hPS).Figure 1 shows schematically a possible spectrum of microdomain structures dependent on the copolymer concentration of a lamellar PS/PB and hPS. Below the critical micelle concentration (CMC) the block copolymer is molecularly dispersed in the homopolymer exhibiting a homogeneous phase. As diblock concentration increases the minority (i.e. PB) forms spherical and/or cylindrical micelles randomly dispersed in the hPS. Further increases in diblock concentration induces long range ordering of various microdomains. In addition three biphasic regions are proposed in which two phases coexist: isotropic cylinders with ordered cylinders, ordered cylinders with ordered bicontinuous double diamond (OBDD), and OBDD with swollen lamellae.

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