Curvature Elasticity of Block Copolymers and the Structure of Emulsified Polymer Blends

1989 ◽  
Vol 177 ◽  
Author(s):  
Zhen-Gang Wang ◽  
S. A. Safran
Keyword(s):  
Free Energy ◽  
Block Copolymer ◽  
Polymer Blends ◽  
Phase Behavior ◽  
Elastic Properties ◽  
Interfacial Layer ◽  
Elastic Moduli ◽  
Spontaneous Curvature ◽  
Polymer Properties ◽  
Curvature Elasticity

ABSTRACTWe consider the curvature elastic properties of a layer of block copolymer at the interface between two incompatible homopolymers. We focus on the relation between the relative lengths of the blocks and the elastic properties of the interfacial layer which determines the phase behavior. The curvature elastic moduli K and K, as well as the spontaneous curvature, c0, are obtained. The curvature free energy is used to predict the relative stability of spherical, cylindrical, lamellar, and ordered bicontinuous saddle-shaped structures as functions of concentration and polymer properties.

Phase Behavior of Highly Immiscible Polymer Blends Stabilized by a Balanced Block Copolymer Surfactant

2003 ◽  
Vol 36 (17) ◽  
pp. 6537-6548 ◽  
Author(s):  
Joon H. Lee ◽  
Megan L. Ruegg ◽  
Nitash P. Balsara ◽  
Yuqing Zhu ◽  
Samuel P. Gido ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Polymer Blends ◽  
Phase Behavior ◽  
Immiscible Polymer Blends ◽  
Immiscible Polymer

Phase behavior of block copolymer/inorganic nanocomposites

2008 ◽  
Vol 64 (a1) ◽  
pp. C146-C146
Author(s):  
P. Thiyagarajan ◽  
V. Pol ◽  
D. Bohnsack ◽  
C.-T. Lo ◽  
B. Lee ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Phase Behavior ◽  
Inorganic Nanocomposites

Phase behavior of semicrystalline polymer blends

Polymer ◽  
2004 ◽  
Vol 45 (11) ◽  
pp. 3671-3679 ◽  
Author(s):  
Chieh-Tsung Lo ◽  
Soenke Seifert ◽  
Pappannan Thiyagarajan ◽  
Balaji Narasimhan
Keyword(s):  
Polymer Blends ◽  
Phase Behavior ◽  
Semicrystalline Polymer

Mechanics of membrane–membrane adhesion

2011 ◽  
Vol 16 (8) ◽  
pp. 872-886 ◽  
Author(s):  
Ashutosh Agrawal
Keyword(s):  
Lipid Vesicles ◽  
Spontaneous Curvature ◽  
Interface Conditions ◽  
Point Boundary ◽  
Lagrange Equations ◽  
Equilibrium Conditions ◽  
Numerical Studies ◽  
Curvature Elasticity ◽  
Equilibrium Shapes ◽  
Membrane Adhesion

Curvature elasticity is used to derive the equilibrium conditions that govern the mechanics of membrane–membrane adhesion. These include the Euler–Lagrange equations and the interface conditions which are derived here for the most general class of strain energies permissible for fluid surfaces. The theory is specialized for homogeneous membranes with quadratic ‘Helfrich’-type energies with non-uniform spontaneous curvatures. The results are employed to solve four-point boundary value problems that simulate the equilibrium shapes of lipid vesicles that adhere to each other. Numerical studies are conducted to investigate the effect of relative sizes, osmotic pressures, and adhesion-induced spontaneous curvature on the morphology of adhered vesicles.

scholarly journals Bending elastic properties of a block copolymer-rich lamellar phase doped by a surfactant: a neutron spin-echo study

Soft Matter ◽  
2014 ◽  
Vol 10 (36) ◽  
pp. 6926-6930 ◽  
Author(s):  
H. Egger ◽  
G. H. Findenegg ◽  
O. Holderer ◽  
R. Biehl ◽  
M. Monkenbusch ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Elastic Properties ◽  
Spin Echo ◽  
Lamellar Phase ◽  
Neutron Spin ◽  
Neutron Spin Echo

Blocked Lipid Exchange in Bilayers and its Possible Influence on the Shape of Vesicles

1974 ◽  
Vol 29 (9-10) ◽  
pp. 510-515 ◽  
Author(s):  
W Helfrich
Keyword(s):  
Red Blood Cells ◽  
Blood Cells ◽  
Spontaneous Curvature ◽  
Lipid Exchange ◽  
Lipid Distribution ◽  
Shape Transformations ◽  
Curvature Elasticity ◽  
Possible Cause

Abstract The role of lipid exchange in the curvature elasticity of bilayers is studied theoretically. Blocking of exchange between the monolayers may give rise to a nonequilibrium lipid distribution going hand in hand with a spontaneous curvature. Some possible consequences for vesicular deformations are discussed. Lipid nonequilibrium is tentatively suggest as one possible cause for certain shape transformations of red blood cells

Phase Behavior and Microstructure in Binary Block Copolymer/Selective Solvent Systems:  Experiments and Theory

1999 ◽  
Vol 32 (3) ◽  
pp. 637-645 ◽  
Author(s):  
Mårten Svensson ◽  
Paschalis Alexandridis ◽  
Per Linse
Keyword(s):  
Block Copolymer ◽  
Phase Behavior ◽  
Selective Solvent ◽  
Solvent Systems
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