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.

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.

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.

scholarly journals Moebius strips of chiral block copolymers

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Zhen Geng ◽  
Bijin Xiong ◽  
Liquan Wang ◽  
Ke Wang ◽  
Min Ren ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Asymmetric Catalysis ◽  
Self Assembly ◽  
Chiral Recognition ◽  
Microphase Separation ◽  
Morphological Evolution ◽  
Mixed Solvents ◽  
Ring Mechanism ◽  
Moebius Strip ◽  
Large Compound

Abstract The Moebius topology (twisted, single-sided strip) is intriguing because of its structural elegance and distinct properties. Here we report the generation of block copolymer Moebius strips via a fast self-assembly of chiral block copolymer polystyrene-block-poly(D-lactide acid) (PS-b-PDLA) in tetrahydrofuran/water mixed solvents. The Moebius strip is formed by morphological evolution from large compound micelle (LCM) to spindle-like micelle (SLM) and then to toroid with a 180° twist along the ring. Mechanism insight reveals that a subtle balance of crystallization of PDLA and microphase separation between PS and PDLA chains dominates the formation of Moebius strips. An intriguing helix-helix transition occurs during the chiral transfer from microphase to assemblies, which is driven by relaxation of the internal stress within SLM related to orientated stretching of PS chains. Mesoporous chiral channels can be generated within Moebius strips after removal of PDLA, which are interesting in chiral recognition, separation and asymmetric catalysis.

Exploring Microphase Separation Behavior of Epoxidized Poly(styrene-b-isoprene-b-styrene) Block Copolymer Inside Thin Epoxy Coatings

2013 ◽  
Vol 46 (6) ◽  
pp. 2182-2187 ◽  
Author(s):  
Hernan Garate ◽  
Iñaki Mondragon ◽  
Norma B. D’Accorso ◽  
Silvia Goyanes
Keyword(s):  
Block Copolymer ◽  
Microphase Separation ◽  
Epoxy Coatings ◽  
Separation Behavior

scholarly journals Microphase-Separation Behavior of Triblock Copolymer Melts. Comparison with Diblock Copolymer Melts

2000 ◽  
Vol 33 (14) ◽  
pp. 5124-5130 ◽  
Author(s):  
Shao-Min Mai ◽  
Withawat Mingvanish ◽  
Simon C. Turner ◽  
Chiraphon Chaibundit ◽  
J. Patrick A. Fairclough ◽  
...  
Keyword(s):  
Diblock Copolymer ◽  
Triblock Copolymer ◽  
Microphase Separation ◽  
Copolymer Melts ◽  
Separation Behavior

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 Preparation of Fluorosilicone Triblock Copolymers and Microphase Separation Behavior on Surfaces

2019 ◽  
Vol 5 (4) ◽  
pp. 105
Author(s):  
Xitao Cheng ◽  
Xuan Tang ◽  
Wenhong Li ◽  
Fangfang Huang ◽  
Qianjin Wang
Keyword(s):  
Microphase Separation ◽  
Triblock Copolymers ◽  
Separation Behavior
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