Direct visualization of microphase separation in block copoly(3-alkylthiophene)s

RSC Advances ◽  
2015 ◽  
Vol 5 (12) ◽  
pp. 8721-8726 ◽  
Author(s):  
Pieter Willot ◽  
Joan Teyssandier ◽  
Wouter Dujardin ◽  
Jinne Adisoejoso ◽  
Steven De Feyter ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Diblock Copolymer ◽  
Microphase Separation ◽  
Direct Visualization ◽  
Block Copolymerization ◽  
One Pot ◽  
Copolymerization Reaction

A copoly(3-alkylthiophene) block copolymer was synthesized in a one-pot block copolymerization reaction, starting from a functional o-tolyl initiator in order to maximize A–B diblock copolymer formation. The microphase separation behaviour was directly visualized using STM.

Synthesis and Self-Assemble Behavior of Block Copolymerization of Vinyl Acetate and N-Vinylacetamide

2013 ◽  
Vol 645 ◽  
pp. 10-14
Author(s):  
Yu Lou ◽  
Dong Jian Shi ◽  
Wei Fu Dong ◽  
Ming Qing Chen
Keyword(s):  
Block Copolymer ◽  
Radical Polymerization ◽  
Vinyl Acetate ◽  
Microphase Separation ◽  
Molar Ratio ◽  
Block Copolymerization ◽  
Bulk State ◽  
Self Assembled

Polymerizations of VAc was carried out using AIBN as the initiator and DIP as the MADIX agent precursor. Then, block copolymer PVAc-b-PNVA had been synthesized by RAFT radical polymerization in the presence of PVAc-DIP as macro CTA. The length of blocks could be tuned by changing the molar ratio of NVA and VAc. Block copolymer PVAc-b-PNVA self-assembled into micelles in solution, and underwent microphase separation in bulk state.

Block Copolymer Thin Films Above and Below the Order-Disorder Transition Temperature

2000 ◽  
Vol 629 ◽  
Author(s):  
Ratchana Limary ◽  
Peter F. Green
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Molecular Weight ◽  
Transition Temperature ◽  
Block Copolymer ◽  
Film Thickness ◽  
Diblock Copolymer ◽  
Diblock Copolymers ◽  
Microphase Separation ◽  
Disorder Transition Temperature

ABSTRACTSymmetric diblock copolymers undergo a disorder to order transition below a microphase separation transition temperature. In this temperature range the structure is characterized by alternating lamellae of thickness L. In thin film geometries, the lamellae are oriented normal to the substrate if there is a preferential interaction between either of the block constituents and the substrate/copolymer or copolymer/vacuum interfaces. Depending on the relation between the film thickness and L, the topography of the film might comprise of holes, islands or spinodal-like structures. We show that in a polystyrene-b-poly(methyl methacrylate) diblock copolymer of molecular weight 20, 000 g/mol, above the microphase separation transition temperature, the topography of the film depends on the thickness. A heirarchy of bicontinuous patterns and holes is observed with increasing film thickness for films thinner than 35 nm.

Controlling the morphology and crystallization of a thiophene-based all-conjugated diblock copolymer by solvent blending

Soft Matter ◽  
2017 ◽  
Vol 13 (31) ◽  
pp. 5261-5268 ◽  
Author(s):  
Huina Cui ◽  
Xiubao Yang ◽  
Juan Peng ◽  
Feng Qiu
Keyword(s):  
Block Copolymer ◽  
Diblock Copolymer ◽  
Microphase Separation ◽  
Photophysical Properties ◽  
Mixed Solvents ◽  
Separation Behavior

We report the crystallization and microphase separation behavior of an all-conjugated poly(3-hexylthiophene)-b-poly[3-(6-hydroxy)hexylthiophene] (P3HT-b-P3HHT) block copolymer in mixed solvents and demonstrate how the conformations of P3HT and P3HHT chains influence the photophysical properties of the copolymer.

scholarly journals Hydrophilic Cross-Linked Aliphatic Hydrocarbon Diblock Copolymer as Proton Exchange Membrane for Fuel Cells

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1617
Author(s):  
David Julius ◽  
Jim Yang Lee ◽  
Liang Hong
Keyword(s):  
Diblock Copolymer ◽  
Proton Exchange Membrane ◽  
Random Copolymer ◽  
Proton Exchange ◽  
Primary Proton ◽  
One Pot ◽  
Fuel Cell Performance ◽  
Alcohol Fuel ◽  
The One ◽  
Exchange Membrane

This study proposes a hydrophobic and hydrophilic aliphatic diblock copolymer wherein the hydrophobic block contains glycidyl methacrylate (GMA) units that are distanced by poly(acrylonitrile) (PAN) segments to fabricate a proton exchange membrane (PEM). This diblock copolymer also known as ionomer due to the hydrophilic block comprising 3-sulfopropyl methacrylate potassium salt (SPM) block. The diblock copolymer was synthesized in the one-pot atom transfer radical polymerization (ATRP) synthesis. Subsequently, the membrane was fabricated by means of solution casting in which an organic diamine, e.g., ethylene diamine (EDA), was introduced to crosslink the diblock copolymer chains via the addition of amine to the epoxide group of GMA. As a result, the PEM attained possesses dual continuous phases, in which the hydrophobic domains are either agglomerated or bridged by the EDA-derived crosslinks, whereas the hydrophilic domains constitute the primary proton conducting channels. The in-situ crosslinking hydrophobic block by using a hydrophilic cross-linker represents the merit aspect since it leads to both improved proton conductivity and dimensional stability in alcohol fuel. To characterize the above properties, Nafion® 117 and random copolymer of P(AN-co-GMA-co-SPM) were used as control samples. The PEM with the optimized composition demonstrates slightly better fuel cell performance than Nafion 117. Lastly, this diblock ionomer is nonfluorinated and hence favors lowering down both material and environmental costs.

One-pot synthesis of PLA-b-PHEA via sequential ROP and RAFT polymerizations

2017 ◽  
Vol 8 (39) ◽  
pp. 6086-6098 ◽  
Author(s):  
Ilknur Yildirim ◽  
Pelin Sungur ◽  
Anna C. Crecelius-Vitz ◽  
Turgay Yildirim ◽  
Diana Kalden ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Ring Opening ◽  
Raft Polymerization ◽  
Ring Opening Polymerization ◽  
One Pot ◽  
One Pot Synthesis

A block copolymer library of polylactide and poly(2-hydroxyethyl acrylate) was prepared via sequential ring opening polymerization and RAFT polymerization in a one-pot approach.

MICROPHASE SEPARATION AND THE MORPHOLOGY OF BLOCK COPOLYMER MELT FILM

2004 ◽  
Author(s):  
YONGMIN HUANG ◽  
JIANBO TANG ◽  
JIE FENG ◽  
HONGLAI LIU ◽  
YING HU
Keyword(s):  
Block Copolymer ◽  
Microphase Separation

Microphase separation in block copolymer/homopolymer blends: Theory and experiment

1997 ◽  
Vol 106 (8) ◽  
pp. 3318-3328 ◽  
Author(s):  
G. Floudas ◽  
N. Hadjichristidis ◽  
M. Stamm ◽  
A. E. Likhtman ◽  
A. N. Semenov
Keyword(s):  
Block Copolymer ◽  
Microphase Separation ◽  
Homopolymer Blends ◽  
Theory And Experiment

scholarly journals Paraspeckles are constructed as block copolymer micelles through microphase separation

2020 ◽  
Author(s):  
Tomohiro Yamazaki ◽  
Tetsuya Yamamoto ◽  
Hyura Yoshino ◽  
Sylvie Souquere ◽  
Shinichi Nakagawa ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Soft Matter ◽  
Microphase Separation ◽  
Theoretical Framework ◽  
Internal Organization ◽  
Ribonucleoprotein Complexes ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles ◽  
Rna Domains ◽  
Soft Matter Physics

SummaryParaspeckles are constructed by NEAT1_2 architectural long noncoding RNAs and possess characteristic cylindrical shapes with highly ordered internal organization, distinct from typical liquid–liquid phase-separated condensates. We experimentally and theoretically investigated how the shape and organization of paraspeckles are determined. We identified the NEAT1_2 RNA domains responsible for shell localization of the NEAT1_2 ends, which determine the characteristic internal organization. We then applied a theoretical framework using soft matter physics to understand the principles that determine the NEAT1_2 organization, shape, number, and size of paraspeckles. By treating paraspeckles as amphipathic block copolymer micelles, we could explain and predict the experimentally observed behaviors of paraspeckles upon NEAT1_2 domain deletions or transcriptional modulation. Thus, we propose that paraspeckles are block copolymer micelles assembled through microphase separation. This work provides an experimentally-based theoretical framework for the concept that ribonucleoprotein complexes (RNPs) can act as block copolymers to form RNA-scaffolding microphase-separated condensates in cells.

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