scholarly journals Thermoresponsive properties of poly(acrylamide-co-acrylonitrile)-based diblock copolymers synthesized (by PISA) in water

2020 ◽  
Vol 11 (37) ◽  
pp. 5998-6008
Author(s):  
Nicolas Audureau ◽  
Fanny Coumes ◽  
Jean-Michel Guigner ◽  
Thi Phuong Thu Nguyen ◽  
Christine Ménager ◽  
...  
Keyword(s):  
Diblock Copolymers ◽  
Morphological Transition ◽  
Poly Acrylamide

UCST-type poly(acrylamide-co-acrylonitrile) diblock copolymers synthesized in water (by PISA) can not only undergo reversible temperature-induced chain dissociation, but also temperature-induced morphological transition.

scholarly journals Crystallization and morphological transition of poly(l-lactide)–poly(ε-caprolactone) diblock copolymers with different block length ratios

RSC Advances ◽  
2017 ◽  
Vol 7 (36) ◽  
pp. 22515-22523 ◽  
Author(s):  
Weiqiang Han ◽  
Xia Liao ◽  
Qi Yang ◽  
Guangxian Li ◽  
Bin He ◽  
...  
Keyword(s):  
Crystallization Temperature ◽  
Diblock Copolymers ◽  
Block Length ◽  
Morphological Transition ◽  
The Relationship

The crystallization temperature has an effect on the relationship between the lamellar twisting and the morphological transition of PLLA.

Thermally induced morphological transition from lamella to gyroid in a binary blend of diblock copolymers

1998 ◽  
Vol 108 (10) ◽  
pp. 4333-4339 ◽  
Author(s):  
Shinichi Sakurai ◽  
Hideo Umeda ◽  
Chizuko Furukawa ◽  
Hiroshi Irie ◽  
Shunji Nomura ◽  
...  
Keyword(s):  
Diblock Copolymers ◽  
Morphological Transition ◽  
Binary Blend ◽  
Thermally Induced

scholarly journals pH-Responsive Non-Ionic Diblock Copolymers: Ionization of Carboxylic Acid End-Groups Induces an Order-Order Morphological Transition

2014 ◽  
Vol 127 (4) ◽  
pp. 1295-1299 ◽  
Author(s):  
Joseph R. Lovett ◽  
Nicholas J. Warren ◽  
Liam P. D. Ratcliffe ◽  
Marzena K. Kocik ◽  
Steven P. Armes
Keyword(s):  
Carboxylic Acid ◽  
Diblock Copolymers ◽  
Morphological Transition ◽  
Ph Responsive ◽  
End Groups

Self-Assembly of Asymmetrical Diblock Copolymers Confined in Carbon Nanotube

2013 ◽  
Vol 420 ◽  
pp. 114-117
Author(s):  
Yu Xin Zuo ◽  
Guo Qiang Wang ◽  
Ying Yu ◽  
Chun Cheng Zuo ◽  
Yi Rui Wang
Keyword(s):  
Carbon Nanotube ◽  
Surface Energy ◽  
Molecular Dynamic ◽  
Self Assembly ◽  
Cohesive Energy ◽  
Diblock Copolymers ◽  
Md Simulations ◽  
Chain Conformation ◽  
The Self ◽  
Morphological Transition

We present molecular dynamic (MD) simulations to model and simulate the self-assembly of asymmetrical diblock copolymers (DCP) confined in carbon nanotube (CNT). The strength of the attractive interaction is systemically varied to examine effects on the self-assembled morphologies. The aim of our study is to understand how the surface energy and cohesive energy affect the structure. The dependence of the chain conformation on the strength of the surface preference is reasonably explained. The energetics is discussed qualitatively and used to account for the appearance of the complex morphological transition.

scholarly journals Vesicles of double hydrophilic pullulan and poly(acrylamide) block copolymers: a combination of synthetic- and bio-derived blocks

2017 ◽  
Vol 8 (7) ◽  
pp. 1244-1254 ◽  
Author(s):  
Jochen Willersinn ◽  
Anna Bogomolova ◽  
Marc Brunet Cabré ◽  
Bernhard V. K. J. Schmidt
Keyword(s):  
Aqueous Solution ◽  
Block Copolymers ◽  
Diblock Copolymers ◽  
Poly Acrylamide

The formation of vesicular structures with average diameters from 200 to 300 nm consisting of double hydrophilic diblock copolymers pullulan-b-poly(N,N-dimethylacrylamide) and pullulan-b-poly(N-ethylacrylamide) in aqueous solution is described.

scholarly journals pH-Responsive Non-Ionic Diblock Copolymers: Ionization of Carboxylic Acid End-Groups Induces an Order-Order Morphological Transition

2014 ◽  
Vol 54 (4) ◽  
pp. 1279-1283 ◽  
Author(s):  
Joseph R. Lovett ◽  
Nicholas J. Warren ◽  
Liam P. D. Ratcliffe ◽  
Marzena K. Kocik ◽  
Steven P. Armes
Keyword(s):  
Carboxylic Acid ◽  
Diblock Copolymers ◽  
Morphological Transition ◽  
Ph Responsive ◽  
End Groups

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.

Equilibrium emulsification of polymer blends by diblock copolymers

1990 ◽  
Vol 51 (2) ◽  
pp. 185-200 ◽  
Author(s):  
Zhen-Gang Wang ◽  
S.A. Safran
Keyword(s):  
Polymer Blends ◽  
Diblock Copolymers
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