The ordered bicontinuous double-diamond morphology in diblock copolymer/homopolymer blends

1992 ◽  
Vol 25 (1) ◽  
pp. 422-428 ◽  
Author(s):  
Karen I. Winey ◽  
Edwin L. Thomas ◽  
Lewis J. Fetters
Keyword(s):  
Diblock Copolymer ◽  
Homopolymer Blends ◽  
Double Diamond

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.

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.

scholarly journals SELF-ASSEMBLY OF SYMMETRIC DIBLOCK COPOLYMER/HOMOPOLYMER BLENDS CONFINED IN SPHERICAL NANOPORES

2011 ◽  
Vol 011 (11) ◽  
pp. 1355-1360 ◽  
Author(s):  
Rongqiao YANG ◽  
Datong DING ◽  
Baohui LI
Keyword(s):  
Diblock Copolymer ◽  
Self Assembly ◽  
Homopolymer Blends

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 Nonperiodic Lamellar Phase in Ternary Diblock Copolymer/Homopolymer Blends

2002 ◽  
Vol 35 (24) ◽  
pp. 8926-8928 ◽  
Author(s):  
J. R. Naughton ◽  
M. W. Matsen
Keyword(s):  
Diblock Copolymer ◽  
Lamellar Phase ◽  
Homopolymer Blends

Lithium Salt-Induced Microstructure and Ordering in Diblock Copolymer/Homopolymer Blends

2016 ◽  
Vol 49 (13) ◽  
pp. 4839-4849 ◽  
Author(s):  
Matthew T. Irwin ◽  
Robert J. Hickey ◽  
Shuyi Xie ◽  
Frank S. Bates ◽  
Timothy P. Lodge
Keyword(s):  
Diblock Copolymer ◽  
Lithium Salt ◽  
Homopolymer Blends
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