Polyhedral Oligosilsesquioxane (POSS) Nanoparticle Localization in Ordered Structures Formed by Solvated Block Copolymers

2013 ◽  
Vol 214 (23) ◽  
pp. 2716-2724 ◽  
Author(s):  
Biswajit Sarkar ◽  
Ebunoluwa Ayandele ◽  
Vinithra Venugopal ◽  
Paschalis Alexandridis
Keyword(s):  
Block Copolymers ◽  
Ordered Structures ◽  
Polyhedral Oligosilsesquioxane ◽  
Poss Nanoparticle

scholarly journals Precise Synthesis and Thin Film Self-Assembly of PLLA-b-PS Bottlebrush Block Copolymers

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1412
Author(s):  
Eunkyung Ji ◽  
Cian Cummins ◽  
Guillaume Fleury
Keyword(s):  
Thin Film ◽  
Block Copolymers ◽  
Self Assembly ◽  
Ring Opening ◽  
Periodic Structures ◽  
One Pot ◽  
Ordered Structures ◽  
Carbonyl Chloride ◽  
Thin Film Patterning ◽  
Nanoporous Templates

The ability of bottlebrush block copolymers (BBCPs) to self-assemble into ordered large periodic structures could greatly expand the scope of photonic and membrane technologies. In this paper, we describe a two-step synthesis of poly(l-lactide)-b-polystyrene (PLLA-b-PS) BBCPs and their rapid thin-film self-assembly. PLLA chains were grown from exo-5-norbornene-2-methanol via ring-opening polymerization (ROP) of l-lactide to produce norbornene-terminated PLLA. Norbonene-terminated PS was prepared using anionic polymerization followed by a termination reaction with exo-5-norbornene-2-carbonyl chloride. PLLA-b-PS BBCPs were prepared from these two norbornenyl macromonomers by a one-pot sequential ring opening metathesis polymerization (ROMP). PLLA-b-PS BBCPs thin-films exhibited cylindrical and lamellar morphologies depending on the relative block volume fractions, with domain sizes of 46–58 nm and periodicities of 70–102 nm. Additionally, nanoporous templates were produced by the selective etching of PLLA blocks from ordered structures. The findings described in this work provide further insight into the controlled synthesis of BBCPs leading to various possible morphologies for applications requiring large periodicities. Moreover, the rapid thin film patterning strategy demonstrated (>5 min) highlights the advantages of using PLLA-b-PS BBCP materials beyond their linear BCP analogues in terms of both dimensions achievable and reduced processing time.

Ordered Structures of Styrene Butadiene Block Copolymers

1967 ◽  
Vol 40 (5) ◽  
pp. 1526-1528
Author(s):  
Ed Vanzo
Keyword(s):  
Solid State ◽  
Block Copolymers ◽  
Mechanical Deformation ◽  
Solution Properties ◽  
Two Dimensional ◽  
Ordered Structure ◽  
Ordered Structures ◽  
Polymer Molecules ◽  
Cast Films ◽  
Styrene Butadiene

Abstract Anionically prepared block copolymers of butadiene and styrene exhibit solution properties which result from a two dimensional ordering of the polymer molecules. The most notable of these properties is the iridescent colors of toluene solutions which are dependent on concentration and abruptly change on mechanical deformation. Electron micrographs of the surface of cast films indicate that the ordered structure is retained to some degree in the solid state.

Hierarchically Ordered Structures of Rod–Rod Block Copolymers Containing Two Mesogen-Jacketed Liquid Crystalline Polymers

2019 ◽  
Vol 52 (24) ◽  
pp. 9504-9511
Author(s):  
Zhehao Tang ◽  
Ping-Ping Hou ◽  
Wei Zhang ◽  
Xiaolin Lyu ◽  
Zhihao Shen ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Liquid Crystalline ◽  
Liquid Crystalline Polymers ◽  
Ordered Structures ◽  
Crystalline Polymers

“Aggregation in Block Copolymer Solutions”

1989 ◽  
Vol 177 ◽  
Author(s):  
M. Olvera de la Cruz
Keyword(s):  
Block Copolymer ◽  
Block Copolymers ◽  
Solvent Effects ◽  
Microphase Separation ◽  
New Materials ◽  
Ordered Structures ◽  
Copolymer Concentration ◽  
Semidilute Solutions ◽  
Copolymer Melts ◽  
Block Sizes

ABSTRACTThe ability to produce block copolymers has led to new materials with unique properties. The chemical connectivity of incompatible blocks forces segregation to occur at distances of the order of the block sizes. In block copolymer melts, the segregated domains form periodic ordered structures called microphases. Most block copolymers are strongly incompatible. In such cases, in order to ensure equilibrium microphase separated samples, the microphases are prepared from solution. Microphase separation in semidilute solutions of block copolymers in nonselective good solvent is analyzed. The solvent effects on the thermodynamics in the weak segregation limit are discussed. The concentration of block copolymer at the transition in good solvents, scales as φtN−.62and in ϑ solvents as N−.5. The transitions between microphase morphologies as a function of block copolymer concentration are studied.

Rapid solvo-microwave annealing for optimizing ordered nanostructures and crystallization of regioregular polythiophene-based block copolymers

2019 ◽  
Vol 10 (36) ◽  
pp. 4962-4972 ◽  
Author(s):  
Junghun Han ◽  
Jin-Seong Kim ◽  
Jae Man Shin ◽  
Hongseok Yun ◽  
Youngkwon Kim ◽  
...  
Keyword(s):  
Thin Films ◽  
Block Copolymers ◽  
Processing Time ◽  
Ordered Structures ◽  
High Crystallinity ◽  
Microwave Annealing ◽  
Short Processing Time ◽  
Ordered Nanostructures

Solvo-microwave annealing is an effective method for producing thin films of polythiophene-based block copolymers with ordered structures and high crystallinity in a very short processing time (∼3 min).

scholarly journals Self-Assembly of Block Copolymers

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 794
Author(s):  
Volker Abetz
Keyword(s):  
Block Copolymer ◽  
Block Copolymers ◽  
Self Assembly ◽  
Soft Matter ◽  
Ordered Structures

Block copolymers and block-copolymer-containing blends represent a fascinating class of soft matter and can self-assemble in a variety of ordered structures on the mesoscale [...]

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