scholarly journals Shape-shifting thermoreversible diblock copolymer nano-objects via RAFT aqueous dispersion polymerization of 4-hydroxybutyl acrylate

2021 ◽  
Author(s):  
Oliver J. Deane ◽  
James Jennings ◽  
Steven P. Armes
Keyword(s):  
Diblock Copolymer ◽  
Dispersion Polymerization ◽  
Aqueous Dispersion ◽  
Nmr Studies ◽  
H Nmr

RAFT aqueous dispersion polymerization of 4-hydroxybutyl acrylate (HBA) affords shape-shifting thermoresponsive diblock copolymer nano-objects. 1H NMR studies suggest that such behavior involves uniform plasticization of the PHBA block.

scholarly journals All-aqueous continuous-flow RAFT dispersion polymerisation for efficient preparation of diblock copolymer spheres, worms and vesicles

2019 ◽  
Vol 4 (5) ◽  
pp. 852-861 ◽  
Author(s):  
Sam Parkinson ◽  
Nicole S. Hondow ◽  
John S. Conteh ◽  
Richard A. Bourne ◽  
Nicholas J. Warren
Keyword(s):  
Block Copolymer ◽  
Diblock Copolymer ◽  
Continuous Flow ◽  
Dispersion Polymerization ◽  
Aqueous Dispersion

A continuous-flow platform enables rapid kinetic profiling and accelerated production of block copolymer nano-objects via RAFT aqueous dispersion polymerization.

scholarly journals Aqueous solution behavior of stimulus-responsive poly(methacrylic acid)-poly(2-hydroxypropyl methacrylate) diblock copolymer nanoparticles

2020 ◽  
Vol 11 (12) ◽  
pp. 2147-2156 ◽  
Author(s):  
Shannon M. North ◽  
Steven P. Armes
Keyword(s):  
Aqueous Solution ◽  
Methacrylic Acid ◽  
Diblock Copolymer ◽  
Dispersion Polymerization ◽  
Aqueous Dispersion ◽  
Solution Temperature ◽  
Solution Ph ◽  
Solution Behavior ◽  
Hydroxypropyl Methacrylate ◽  
Stimulus Responsive

RAFT aqueous dispersion polymerization is used to prepare poly(methacrylic acid)-poly(2-hydroxypropyl methacrylate) diblock copolymer nanoparticles, which exhibit stimulus-responsive behaviour on adjusting the solution temperature and/or solution pH.

Synthesis by nitroxide-mediated aqueous dispersion polymerization, characterization, and physical core-crosslinking of pH- and thermoresponsive dynamic diblock copolymer micelles

2012 ◽  
Vol 3 (6) ◽  
pp. 1526 ◽  
Author(s):  
Guillaume Delaittre ◽  
Maud Save ◽  
Marianne Gaborieau ◽  
Patrice Castignolles ◽  
Jutta Rieger ◽  
...  
Keyword(s):  
Diblock Copolymer ◽  
Dispersion Polymerization ◽  
Aqueous Dispersion ◽  
Copolymer Micelles

scholarly journals In situ SAXS studies of a prototypical RAFT aqueous dispersion polymerization formulation: monitoring the evolution in copolymer morphology during polymerization-induced self-assembly

2020 ◽  
Vol 11 (42) ◽  
pp. 11443-11454 ◽  
Author(s):  
Adam Czajka ◽  
Steven P. Armes
Keyword(s):  
Diblock Copolymer ◽  
Small Angle ◽  
Self Assembly ◽  
Dispersion Polymerization ◽  
Chain Transfer ◽  
Aqueous Dispersion ◽  
X Ray ◽  
X Ray Scattering ◽  
Reversible Addition

In situ small-angle X-ray scattering is used to monitor the formation of diblock copolymer spheres, worms and vesicles during reversible addition-fragmentation chain transfer (RAFT) aqueous dispersion polymerization of 2-hydroxypropyl methacrylate.

scholarly journals RAFT aqueous dispersion polymerization of 4-hydroxybutyl acrylate: effect of end-group ionization on the formation and colloidal stability of sterically-stabilized diblock copolymer nanoparticles

2022 ◽  
Author(s):  
Deborah L. Beattie ◽  
Oliver J. Deane ◽  
Oleksandr O. Mykhaylyk ◽  
Steven P. Armes
Keyword(s):  
Diblock Copolymer ◽  
Self Assembly ◽  
Dispersion Polymerization ◽  
Colloidal Stability ◽  
Aqueous Dispersion ◽  
Aqueous Polymerization ◽  
Raft Agent ◽  
End Group

Poly(2-hydroxyethyl acrylate)-poly(4-hydroxybutyl acrylate) nano-objects are prepared by aqueous polymerization-induced self-assembly (PISA) using an ionic RAFT agent.

scholarly journals One-pot synthesis and aqueous solution properties of pH-responsive schizophrenic diblock copolymer nanoparticles prepared via RAFT aqueous dispersion polymerization

2021 ◽  
Author(s):  
S. M. North ◽  
S. P. Armes
Keyword(s):  
Aqueous Solution ◽  
Diblock Copolymer ◽  
Dispersion Polymerization ◽  
Aqueous Dispersion ◽  
Solution Properties ◽  
Ph Responsive ◽  
One Pot ◽  
One Pot Synthesis ◽  
Isoelectric Points

Well-defined doubly pH-responsive schizophrenic diblock copolymer nanoparticles with tunable isoelectric points are prepared via RAFT aqueous dispersion polymerization using an efficient one-pot protocol.

1H NMR Conformational Studies in Water of Angiotensin II Analogues Modified at the N- and C-Termini: Interactions of the Aromatic Side Chains and Folding of the N-Terminal Domain

1994 ◽  
Vol 59 (11) ◽  
pp. 2523-2532 ◽  
Author(s):  
John Hondrelis ◽  
John Matsoukas ◽  
George Agelis ◽  
Paul Cordopatis ◽  
Ning Zhou ◽  
...  
Keyword(s):  
Shielding Effect ◽  
Resonance Spectroscopy ◽  
Nmr Studies ◽  
Previous Suggestion ◽  
Aminoisobutyric Acid ◽  
H Nmr ◽  
Neutral Ph ◽  
Angiotensin Ii Analogues ◽  
Proton Resonances ◽  
Cosy Nmr

The conformation of [Sar1]angiotensin II in water at neutral pH has been examined by proton magnetic resonance spectroscopy at 400 MHz and in particular by comparing its 1H NMR spectral data with those of analogues modified at positions 1,4 and 6, namely [Sar1,Cha8]ANGII, [Des Asp1,Cha8]ANGII, [Aib1,Tyr(Me)4]ANGII, [Aib1,Tyr(Me)4,Ile8]ANGII, [N-MeAib1,Tyr(Me)4]ANGII, [N-MeAib1,Tyr(Me)4,Ile8]ANGII, ANGIII and [Sar1,Ile8]ANGII. Assignment of all proton resonances in these analogues was made possible by 2D COSY NMR experiments. The H-2 and H-4 protons for the histidine ring in [Sar1]ANGII, ANGII and ANGIII were shielded compared with the same protons in [Sar1,Ile8]ANGII, [Sar1,Cha8]ANGII and [Des Asp1,Cha8]ANGII; this shielding effect was not disturbed upon methylation of the tyrosine hydroxyl and/or replacement of residue 1 (sarcosine or aspartic acid) with aminoisobutyric acid (Aib) or N-methyl aminoisobutyric acid (N-MeAib). These data are consistent with our previous suggestion based on NMR studies in neutral DMSO that a characteristic folded conformation for ANGII previously observed in non-polar solvents can also be detected in water at neutral pH, but to a lesser degree.

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