Star-shaped and star-block polymers with a porphyrin core: from LCST–UCST thermoresponsive transition to tunable self-assembly behaviour and fluorescence performance

RSC Advances ◽  
2016 ◽  
Vol 6 (8) ◽  
pp. 6802-6810 ◽  
Author(s):  
Weizhong Yuan ◽  
Xiangnan Chen
Keyword(s):  
Block Copolymers ◽  
Self Assembly ◽  
Block Polymers ◽  
Porphyrin Core ◽  
Self Assembled ◽  
Star Block Copolymers

The micelles self-assembled from star-shaped and star-block copolymers present a transition of LCST–UCST thermoresponsive properties through a facile quaternization reaction.

scholarly journals Tuning Size and Morphology of mPEG-b-p(HPMA-Bz) Copolymer Self-Assemblies Using Microfluidics

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2572
Author(s):  
Jaleesa Bresseleers ◽  
Mahsa Bagheri ◽  
Coralie Lebleu ◽  
Sébastien Lecommandoux ◽  
Olivier Sandre ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Self Assembly ◽  
Size Difference ◽  
Flow Rates ◽  
Polymer Vesicles ◽  
Attractive Option ◽  
Self Assembled ◽  
Size And Morphology ◽  
Poly Ethylene ◽  
Careful Design

The careful design of nanoparticles, in terms of size and morphology, is of great importance to developing effective drug delivery systems. The ability to precisely tailor nanoparticles in size and morphology during polymer self-assembly was therefore investigated. Four poly(ethylene glycol)-b-poly(N-2-benzoyloxypropyl methacrylamide) mPEG-b-p(HPMA-Bz) block copolymers with a fixed hydrophilic block of mPEG 5 kDa and a varying molecular weight of the hydrophobic p(HPMA-Bz) block (A: 17.1, B: 10.0, C: 5.2 and D: 2.7 kDa) were self-assembled into nanoparticles by nanoprecipitation under well-defined flow conditions, using microfluidics, at different concentrations. The nanoparticles from polymer A, increased in size from 55 to 90 nm using lower polymer concentrations and slower flow rates and even polymer vesicles were formed along with micelles. Similarly, nanoparticles from polymer D increased in size from 35 to 70 nm at slower flow rates and also formed vesicles along with micelles, regardless of the used concentration. Differently, polymers B and C mainly self-assembled into micelles at the different applied flow rates with negligible size difference. In conclusion, this study demonstrates that the self-assembly of mPEG-b-p(HPMA-Bz) block copolymers can be easily tailored in size and morphology using microfluidics and is therefore an attractive option for further scaled-up production activities.

scholarly journals Temperature-responsive self-assembly of star block copolymers with poly(ionic liquid) segments

2012 ◽  
Vol 44 (6) ◽  
pp. 550-560 ◽  
Author(s):  
Hideharu Mori ◽  
Yuki Ebina ◽  
Riina Kambara ◽  
Kazuhiro Nakabayashi
Keyword(s):  
Ionic Liquid ◽  
Block Copolymers ◽  
Self Assembly ◽  
Temperature Responsive ◽  
Star Block Copolymers ◽  
Poly Ionic Liquid

Phase separation and self-assembly of cyclic amphiphilic block copolymers with a main-chain liquid crystalline segment

2015 ◽  
Vol 6 (22) ◽  
pp. 4167-4176 ◽  
Author(s):  
Satoshi Honda ◽  
Maito Koga ◽  
Masatoshi Tokita ◽  
Takuya Yamamoto ◽  
Yasuyuki Tezuka
Keyword(s):  
Phase Separation ◽  
Solid State ◽  
Block Copolymers ◽  
Electric Field ◽  
Self Assembly ◽  
Liquid Crystalline ◽  
Main Chain ◽  
Amphiphilic Block Copolymers ◽  
Cylindrical Micelles ◽  
Self Assembled

The effects of the macrocyclization of amphiphiles with a liquid crystalline segment were investigated in the solid state, and electric field-responsive cylindrical micelles and vesicles were self-assembled.

Periodically ordered nanohetero inorganic structures of nanoparticles, nanorods and layers in a matrix from self-assembled block copolymers

2014 ◽  
Vol 1706 ◽  
Author(s):  
Hiroaki Wakayama ◽  
Hirotaka Yonekura ◽  
Yasuaki Kawai
Keyword(s):  
Block Copolymers ◽  
Self Assembly ◽  
Three Dimensional ◽  
Functional Materials ◽  
Domain Size ◽  
Great Promise ◽  
Layer By Layer ◽  
Simple Method ◽  
Self Assembled ◽  
Size And Morphology

ABSTRACTPeriodically ordered nanohetero inorganic structures offer great promise due to their unique electric, ionic, magnetic, and photonic properties. Many studies have focused on the formation of periodically ordered nano-hetero inorganic structures through layer-by-layer adsorption, sputtering, and self-assembly methods. However, the construction of three-dimensional periodically ordered nanohetero inorganic structures with desired sizes and morphologies remains a great challenge. We present a simple method for producing three-dimensional periodically ordered inorganic nanoheterostructures with controlled shape and size by replicating self-assembled block copolymers (BCPs) containing precursors of metals and metal oxides. Precursors were dissolved with BCPs in a solvent. Upon evaporation of the solvent, each precursor was selectively introduced into a separate polymer block. Application of an external magnetic field (10 T) to the BCP-precursor composites resulted in a phase transition of from spheres to hexagonal cylinders. Subsequent pyrolytic removal of the BCPs produced periodically ordered nanoheterostructures that were structural replicates of the precursor–BCP composites. Self-assembled nano-hetero inorganic structures of nanoparticles, nanorods and layers in a matrix were produced. The morphology and domain size can be tailored by controlling the molecular weight and relative block length of block copolymers. The controlled size and morphology of the inorganic nanoheterostructures demonstrate the method’s utility for producing highly functional materials.

scholarly journals Polymer-based multiferroic nanocomposites via directed block copolymer self-assembly

2019 ◽  
Vol 7 (4) ◽  
pp. 968-976 ◽  
Author(s):  
Ivan Terzić ◽  
Niels L. Meereboer ◽  
Harm Hendrik Mellema ◽  
Katja Loos
Keyword(s):  
Magnetic Nanoparticles ◽  
Block Copolymer ◽  
Block Copolymers ◽  
Self Assembly ◽  
Self Assembled

Directed dispersion of magnetic nanoparticles inside self-assembled ferroelectric block copolymers holds promises for future improved multiferroics.

Thermoresponsive (star) block copolymers from one-pot sequential RAFT polymerizations and their self-assembly in aqueous solution

Polymer ◽  
2016 ◽  
Vol 107 ◽  
pp. 422-433 ◽  
Author(s):  
Christoph Herfurth ◽  
André Laschewsky ◽  
Laurence Noirez ◽  
Benjamin von Lospichl ◽  
Michael Gradzielski
Keyword(s):  
Aqueous Solution ◽  
Block Copolymers ◽  
Self Assembly ◽  
One Pot ◽  
Star Block Copolymers

Self-assembled micelles of well-defined pentaerythritol-centered amphiphilic A4B8 star-block copolymers based on PCL and PEG for hydrophobic drug delivery

Polymer ◽  
2011 ◽  
Vol 52 (13) ◽  
pp. 2799-2809 ◽  
Author(s):  
Mohammad Reza Nabid ◽  
Seyed Jamal Tabatabaei Rezaei ◽  
Roya Sedghi ◽  
Hassan Niknejad ◽  
Ali Akbar Entezami ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Block Copolymers ◽  
Hydrophobic Drug ◽  
Self Assembled ◽  
Star Block Copolymers
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