Self-Assembly of Block Copolymers in Selective Solvents:  Influence of Relative Block Size on Phase Behavior

Langmuir ◽  
2000 ◽  
Vol 16 (17) ◽  
pp. 6839-6846 ◽  
Author(s):  
Birgitta Svensson ◽  
Ulf Olsson ◽  
Paschalis Alexandridis
Keyword(s):  
Block Copolymers ◽  
Phase Behavior ◽  
Self Assembly ◽  
Block Size ◽  
Selective Solvents

scholarly journals Uniform electroactive fibre-like micelle nanowires for organic electronics

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Xiaoyu Li ◽  
Piotr J. Wolanin ◽  
Liam R. MacFarlane ◽  
Robert L. Harniman ◽  
Jieshu Qian ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Charge Carrier ◽  
Self Assembly ◽  
Diblock Copolymers ◽  
Field Effect Transistors ◽  
Fibre Length ◽  
Charge Carrier Mobility ◽  
Degree Of Polymerization ◽  
Selective Solvents ◽  
The Individual

Abstract Micelles formed by the self-assembly of block copolymers in selective solvents have attracted widespread attention and have uses in a wide variety of fields, whereas applications based on their electronic properties are virtually unexplored. Herein we describe studies of solution-processable, low-dispersity, electroactive fibre-like micelles of controlled length from π-conjugated diblock copolymers containing a crystalline regioregular poly(3-hexylthiophene) core and a solubilizing, amorphous regiosymmetric poly(3-hexylthiophene) or polystyrene corona. Tunnelling atomic force microscopy measurements demonstrate that the individual fibres exhibit appreciable conductivity. The fibres were subsequently incorporated as the active layer in field-effect transistors. The resulting charge carrier mobility strongly depends on both the degree of polymerization of the core-forming block and the fibre length, and is independent of corona composition. The use of uniform, colloidally stable electroactive fibre-like micelles based on common π-conjugated block copolymers highlights their significant potential to provide fundamental insight into charge carrier processes in devices, and to enable future electronic applications.

Radio-opaque Micelles for X-ray Imaging

2014 ◽  
Vol 67 (1) ◽  
pp. 78 ◽  
Author(s):  
Zhiyong Wang ◽  
Teddy Chang ◽  
Luke Hunter ◽  
Andrew M. Gregory ◽  
Marcel Tanudji ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Self Assembly ◽  
Block Size ◽  
Drug Carriers ◽  
Block Copolymerization ◽  
X Ray ◽  
Transmission Electron ◽  
X Ray Imaging ◽  
Reversible Addition ◽  
Rate Of Polymerization

Block copolymers based on iodinated monomers were prepared with the aim of creating nanoparticles as contrast agents suitable for X-ray imaging. Reversible addition–fragmentation chain-transfer polymerization was employed to synthesize block copolymers based on oligo(ethylene glycol) methylether methacrylate (OEGMEMA) and 2-[2′,3′,5′-triiodobenzoyl]oxyethyl methacrylate (METB). The polymerization of METB was found to be slow owing to the low solubility of the monomer, which does not allow high enough concentration to achieve a fast rate of polymerization. However, the block copolymerization was well controlled, resulting in several block copolymers, POEGMEMA-b-PMETB, which were further investigated in regards to their self-assembly in water. Micelles were prepared using POEGMEMA55-b-PMETB18, POEGMEMA55-b-PMETB32, POEGMEMA100-b-PMETB22, and POEGMEMA100-b-PMETB32. Transmission electron microscopy and dynamic light scattering revealed micelle sizes between 30 and 45 nm depending on the block size. The micelles were found to show a strong contrast similar to BaSO4 and Visipaque (iodixanol) during X-ray analysis. These micelles can now further be employed as drug carriers or can be conjugated to a bioactive group for targeting.

Aggregation-induced emission block copolymers based on ring-opening metathesis polymerization

RSC Advances ◽  
2014 ◽  
Vol 4 (93) ◽  
pp. 51194-51200 ◽  
Author(s):  
Yuming Zhao ◽  
Ying Wu ◽  
Guowei Yan ◽  
Ke Zhang
Keyword(s):  
Block Copolymers ◽  
Self Assembly ◽  
Ring Opening ◽  
Water Soluble ◽  
Amphiphilic Block Copolymers ◽  
Ring Opening Metathesis Polymerization ◽  
Metathesis Polymerization ◽  
Aggregation Induced Emission ◽  
Selective Solvents ◽  
First Time

AIE amphiphilic block copolymers were developed from ROMP for the first time. By self-assembly in selective solvents, water soluble fluorescent nano-objects were prepared with varied structures including micelles and vesicles.

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