scholarly journals Ringed Spherulite in Binary Blends of Poly(ε-caprolactone) and ε-Caprolactone-Butadiene Diblock Copolymer

1991 ◽  
Vol 23 (12) ◽  
pp. 1473-1482 ◽  
Author(s):  
Shuichi Nojima ◽  
Dajing Wang ◽  
Tamaichi Ashida
Keyword(s):  
Diblock Copolymer ◽  
Binary Blends

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.

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.

Isothermal morphology diagrams for binary blends of diblock copolymer and homopolymer

1992 ◽  
Vol 25 (10) ◽  
pp. 2645-2650 ◽  
Author(s):  
Karen I. Winey ◽  
Edwin L. Thomas ◽  
Lewis J. Fetters
Keyword(s):  
Diblock Copolymer ◽  
Binary Blends

Ellipsometry as a probe of crystallization in binary blends of a sphere-forming diblock copolymer

2011 ◽  
Vol 49 (10) ◽  
pp. 712-716 ◽  
Author(s):  
Jessica L. Carvalho ◽  
Michael E. Somers ◽  
Kari Dalnoki-Veress
Keyword(s):  
Diblock Copolymer ◽  
Binary Blends

Phase Behavior of Binary Blends of Diblock Copolymer/Homopolymer Confined in Spherical Nanopores

Langmuir ◽  
2011 ◽  
Vol 28 (2) ◽  
pp. 1569-1578 ◽  
Author(s):  
Rongqiao Yang ◽  
Baohui Li ◽  
An-Chang Shi
Keyword(s):  
Phase Behavior ◽  
Diblock Copolymer ◽  
Binary Blends

Complex Macrophase-Separated Nanostructure Induced by Microphase Separation in Binary Blends of Lamellar Diblock Copolymer Thin Films

2014 ◽  
Vol 35 (18) ◽  
pp. 1622-1629 ◽  
Author(s):  
Jianqi Zhang ◽  
Dorthe Posselt ◽  
Detlef-M. Smilgies ◽  
Jan Perlich ◽  
Konstantinos Kyriakos ◽  
...  
Keyword(s):  
Thin Films ◽  
Diblock Copolymer ◽  
Microphase Separation ◽  
Binary Blends
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