Effect of correlated random copolymers at a liquid–liquid interface: Is it comparable with that of diblock copolymers?

2001 ◽  
Vol 114 (10) ◽  
pp. 4696 ◽  
Author(s):  
N. A. Denesyuk
Keyword(s):  
Diblock Copolymers ◽  
Liquid Interface ◽  
Random Copolymers

pH-Controlled Adsorption of Polyelectrolyte Diblock Copolymers at the Solid/Liquid Interface

Langmuir ◽  
2000 ◽  
Vol 16 (14) ◽  
pp. 5980-5986 ◽  
Author(s):  
D. A. Styrkas ◽  
V. Bütün ◽  
J. R. Lu ◽  
J. L. Keddie ◽  
S. P. Armes
Keyword(s):  
Diblock Copolymers ◽  
Liquid Interface ◽  
Controlled Adsorption ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Ph Controlled

Adsorption of Ampholytic Diblock Copolymers from Dilute Aqueous Solution at the Solid/Liquid Interface

Langmuir ◽  
1999 ◽  
Vol 15 (4) ◽  
pp. 1260-1267 ◽  
Author(s):  
H. Walter ◽  
C. Harrats ◽  
P. Müller-Buschbaum ◽  
R. Jérôme ◽  
M. Stamm
Keyword(s):  
Aqueous Solution ◽  
Diblock Copolymers ◽  
Liquid Interface ◽  
Dilute Aqueous Solution ◽  
Solid Liquid Interface ◽  
Solid Liquid

Lateral Structures of Thin Films of Ampholytic Diblock Copolymers Adsorbed from Dilute Aqueous Solution at the Solid/Liquid Interface

Langmuir ◽  
1999 ◽  
Vol 15 (20) ◽  
pp. 6984-6990 ◽  
Author(s):  
H. Walter ◽  
P. Müller-Buschbaum ◽  
J. S. Gutmann ◽  
C. Lorenz-Haas ◽  
C. Harrats ◽  
...  
Keyword(s):  
Thin Films ◽  
Aqueous Solution ◽  
Diblock Copolymers ◽  
Liquid Interface ◽  
Dilute Aqueous Solution ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Lateral Structures

scholarly journals On the formation of inclusion complexes at the solid/liquid interface of anchored temperature-responsive PNIPAAM diblock copolymers with γ-cyclodextrin

2017 ◽  
Vol 295 (8) ◽  
pp. 1327-1341 ◽  
Author(s):  
Giuseppe Lazzara ◽  
Richard A. Campbell ◽  
Solmaz Bayati ◽  
Kaizheng Zhu ◽  
Bo Nyström ◽  
...  
Keyword(s):  
Inclusion Complexes ◽  
Diblock Copolymers ◽  
Liquid Interface ◽  
Temperature Responsive ◽  
Solid Liquid Interface ◽  
Solid Liquid

Electron microscopy of crystalline structure in thermotropic random copolymers

1991 ◽  
Vol 49 ◽  
pp. 1054-1055
Author(s):  
Afzana Anwer ◽  
S. Eilidh Bedford ◽  
Richard J. Spontak ◽  
Alan H. Windle
Keyword(s):  
Electron Microscopy ◽  
Crystalline Structure ◽  
Liquid Crystalline ◽  
Elevated Temperatures ◽  
Random Copolymers ◽  
Molecular Characteristics ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Identical Monomer ◽  
Periodic Layer

Random copolyesters composed of wholly aromatic monomers such as p-oxybenzoate (B) and 2,6-oxynaphthoate (N) are known to exhibit liquid crystalline characteristics at elevated temperatures and over a broad composition range. Previous studies employing techniques such as X-ray diffractometry (XRD) and differential scanning calorimetry (DSC) have conclusively proven that these thermotropic copolymers can possess a significant crystalline fraction, depending on molecular characteristics and processing history, despite the fact that the copolymer chains possess random intramolecular sequencing. Consequently, the nature of the crystalline structure that develops when these materials are processed in their mesophases and subsequently annealed has recently received considerable attention. A model that has been consistent with all experimental observations involves the Non-Periodic Layer (NPL) crystallite, which occurs when identical monomer sequences enter into register between adjacent chains. The objective of this work is to employ electron microscopy to identify and characterize these crystallites.

Morphological behavior of compatibilized ternary blends prepared by mechanical mixing

1993 ◽  
Vol 51 ◽  
pp. 1200-1201
Author(s):  
S.D. Smith ◽  
R.J. Spontak ◽  
D.H. Melik ◽  
S.M. Buehler ◽  
K.M. Kerr ◽  
...  
Keyword(s):  
Interfacial Adhesion ◽  
Diblock Copolymers ◽  
Ternary Blends ◽  
Mechanical Mixing ◽  
Design Considerations ◽  
Covalently Bonded ◽  
Homopolymer Blends ◽  
Emulsifying Agent ◽  
Surface Active ◽  
Low Entropy

When blended together, homopolymers A and B will normally macrophase-separate into relatively large (≫1 μm) A-rich and B-rich phases, between which exists poor interfacial adhesion, due to a low entropy of mixing. The size scale of phase separation in such a blend can be reduced, and the extent of interfacial A-B contact and entanglement enhanced, via addition of an emulsifying agent such as an AB diblock copolymer. Diblock copolymers consist of a long sequence of A monomers covalently bonded to a long sequence of B monomers. These materials are surface-active and decrease interfacial tension between immiscible phases much in the same way as do small-molecule surfactants. Previous studies have clearly demonstrated the utility of block copolymers in compatibilizing homopolymer blends and enhancing blend properties such as fracture toughness. It is now recognized that optimization of emulsified ternary blends relies upon design considerations such as sufficient block penetration into a macrophase (to avoid block slip) and prevention of a copolymer multilayer at the A-B interface (to avoid intralayer failure).

Triply-periodic nanostructures in surfactant, block copolymer, and biomembrane systems, and simulation of TEMs

1993 ◽  
Vol 51 ◽  
pp. 884-885
Author(s):  
David M. Anderson ◽  
Tomas Landh
Keyword(s):  
Liquid Crystalline ◽  
Diblock Copolymers ◽  
Cubic Phase ◽  
List Type ◽  
Interpenetrating Networks ◽  
Triply Periodic ◽  
Wide Range ◽  
Bicontinuous Cubic ◽  
Phase Liquid ◽  
Dividing Surface

First discovered in surfactant-water liquid crystalline systems, so-called ‘bicontinuous cubic phases’ have the property that hydropnilic and lipophilic microdomains form interpenetrating networks conforming to cubic lattices on the scale of nanometers. Later these same structures were found in star diblock copolymers, where the simultaneous continuity of elastomeric and glassy domains gives rise to unique physical properties. Today it is well-established that the symmetry and topology of such a morphology are accurately described by one of several triply-periodic minimal surfaces, and that the interface between hydrophilic and hydrophobic, or immiscible polymer, domains is described by a triply-periodic surface of constant, nonzero mean curvature. One example of such a dividing surface is shown in figure 5.The study of these structures has become of increasing importance in the past five years for two reasons:1)Bicontinuous cubic phase liquid crystals are now being polymerized to create microporous materials with monodispersed pores and readily functionalizable porewalls; figure 3 shows a TEM from a polymerized surfactant / methylmethacrylate / water cubic phase; and2)Compelling evidence has been found that these same morphologies describe biomembrane systems in a wide range of cells.

Sign in / Sign up

Export Citation Format

Share Document