scholarly journals Shear-induced alignment of block copolymer worms in mineral oil

Soft Matter ◽  
2021 ◽  
Vol 17 (39) ◽  
pp. 8867-8876
Author(s):  
Matthew J. Derry ◽  
Oleksandr O. Mykhaylyk ◽  
Steven P. Armes
Keyword(s):  
Block Copolymer ◽  
Diblock Copolymer ◽  
Mineral Oil ◽  
Reversible Transformation

Optorheology studies of thermoresponsive diblock copolymer nano-objects dispersed in mineral oil indicate reversible transformation from randomly oriented branched worms at 20 °C to aligned linear worms at 80–110 °C and isotropic spheres at 150 °C.

scholarly journals RAFT dispersion polymerization of glycidyl methacrylate for the synthesis of epoxy-functional block copolymer nanoparticles in mineral oil

2019 ◽  
Vol 10 (5) ◽  
pp. 603-611 ◽  
Author(s):  
Philip J. Docherty ◽  
Matthew J. Derry ◽  
Steven P. Armes
Keyword(s):  
Block Copolymer ◽  
Diblock Copolymer ◽  
Glycidyl Methacrylate ◽  
Dispersion Polymerization ◽  
Chain Transfer ◽  
Mineral Oil ◽  
Functional Block ◽  
Reversible Addition ◽  
Stearyl Methacrylate

Epoxy-functional poly(stearyl methacrylate)-poly(glycidyl methacrylate) (PSMA-PGlyMA) diblock copolymer nanoparticles are synthesized via reversible addition–fragmentation chain transfer (RAFT) dispersion polymerization of glycidyl methacrylate (GlyMA) in mineral oil at 70 °C.

scholarly journals Tuning the vesicle-to-worm transition for thermoresponsive block copolymer vesicles prepared via polymerisation-induced self-assembly

2021 ◽  
Author(s):  
Isabella R. Dorsman ◽  
Matthew J. Derry ◽  
Victoria J. Cunningham ◽  
Steven L. Brown ◽  
Clive N. Williams ◽  
...  
Keyword(s):  
Critical Temperature ◽  
Block Copolymer ◽  
Diblock Copolymer ◽  
Self Assembly ◽  
Mineral Oil ◽  
Butyl Methacrylate

Does statistical copolymerization of n-butyl methacrylate with benzyl methacrylate lower the critical temperature required for vesicle-to-worm and worm-to-sphere transitions for diblock copolymer nano-objects in mineral oil?

scholarly journals Block copolymer microparticles comprising inverse bicontinuous phases prepared via polymerization-induced self-assembly

2019 ◽  
Vol 10 (15) ◽  
pp. 4200-4208 ◽  
Author(s):  
Pengcheng Yang ◽  
Yin Ning ◽  
Thomas J. Neal ◽  
Elizabeth R. Jones ◽  
Bryony R. Parker ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Internal Structure ◽  
Diblock Copolymer ◽  
Self Assembly ◽  
Bicontinuous Phases

Scalable preparation of micrometer-sized diblock copolymer particles exhibiting complex internal structure is achieved by RAFT-mediated polymerization-induced self-assembly (PISA).

Phase Transitions in Thin Block Copolymer Films

MRS Bulletin ◽  
2010 ◽  
Vol 35 (6) ◽  
pp. 457-465 ◽  
Author(s):  
Edward J. Kramer
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Block Copolymer ◽  
Diblock Copolymer ◽  
Smectic Liquid Crystals ◽  
Material System ◽  
Thermal Generation ◽  
Copolymer Films ◽  
Bcc Structure ◽  
Line Defects

AbstractDavid Turnbull's experiments and theoretical insights paved the way for much of our modern understanding of phase transitions in materials. In recognition of his contributions, this lecture will concentrate on phase transitions in a material system not considered by Turnbull, thin diblock copolymer films. Well-ordered block copolymer films are attracting increasing interest as we attempt to extend photolithography to smaller dimensions. In the case of diblock copolymer spheres, an ordered monolayer is hexagonal, but the ordered bulk is body-centered cubic (bcc). There is no hexagonal plane in the bcc structure, so a phase transition must occur as n, the number of layers of spheres in the film, increases. How this phase transition occurs with nand how it can be manipulated is the subject of the first part of my presentation. In the second part of the talk, I show that monolayers of diblock copolymer spheres and cylinders undergo order-to-disorder transitions that differ greatly from those of the bulk. These ordered 2D monolayers are susceptible to phonon-generated disorder as well as to thermal generation of defects, such as dislocations, which, while they are line defects in 3D, are point defects in 2D. The results are compared to the theories of melting of 2D crystals (spheres) and of 2D smectic liquid crystals (cylinders), a comparison that will allow us to understand most, but not all, of the features of these order-disorder transitions that occur as the temperature is increased.

Synthesis of Self-Assembled Metal-Oxide Nanostructures in a Diblock Copolymer Matrix and Integration onto Semiconductor Surfaces

2000 ◽  
Vol 642 ◽  
Author(s):  
Robert F. Mulligan ◽  
Agis A. Iliadis ◽  
U. Lee ◽  
Peter Kofinas
Keyword(s):  
Block Copolymer ◽  
Diblock Copolymer ◽  
Photoelectron Spectroscopy ◽  
Ring Opening ◽  
Diblock Copolymers ◽  
X Ray ◽  
Oxide Nanostructures ◽  
Metal Oxide Nanostructures ◽  
Self Assembled ◽  
Zno Nanoclusters

ABSTRACTThe synthesis of self-assembled ZnO nanostructures at room temperature using a microphase separated diblock copolymer as a template is reported. Poly(norbornene) / poly(norbornene-dicarboxylic acid) diblock copolymers were synthesized using Ring Opening Metathesis Polymerization (ROMP). The polymers were dissolved and the solutions were doped with ZnCl2. Films were formed from this solution, and subsequently reacted with NH4OH. This converted the ZnCl2 into ZnO contained within the microphase-separated nanodomains of the block copolymer. Fourier Transform Infrared Spectroscopy verified the association of the metal to the second block of the polymer, and X-ray Photoelectron Spectroscopy verified the conversion of the salt to ZnO nanoclusters. The development of such ZnO - block copolymer nanocomposites is targeting the functionalization of nanostructures into device technologies.

Electric-field-induced lamellar to hexagonally perforated lamellar transition in diblock copolymer thin films: kinetic pathways

2016 ◽  
Vol 18 (36) ◽  
pp. 25609-25620 ◽  
Author(s):  
Arnab Mukherjee ◽  
Kumar Ankit ◽  
Andreas Reiter ◽  
Michael Selzer ◽  
Britta Nestler
Keyword(s):  
Thin Films ◽  
Block Copolymer ◽  
Electric Field ◽  
Diblock Copolymer ◽  
Substrate Interaction ◽  
Symmetric Block

In this work, the confluence of an electric field, substrate interaction and confinement is shown to induce a parallel lamellar to hexagonally perforated lamellar transition in symmetric block-copolymer thin films.

pH-responsive microspheres encapsulated with iron oxide nanoaggregates for gastrointestinal delivery

2012 ◽  
Vol 27 (1) ◽  
pp. 54-66 ◽  
Author(s):  
Young Ju Son ◽  
Hyuk Sang Yoo
Keyword(s):  
Iron Oxide ◽  
Block Copolymer ◽  
Block Copolymers ◽  
Diblock Copolymer ◽  
Ph Responsive ◽  
Polymeric Microspheres ◽  
Intestinal Delivery ◽  
Poly Ethylene ◽  
The Stability

Block copolymer-stabilized iron oxide nanoaggregates were fabricated into pH-responsive polymeric microspheres for intestinal delivery of the magnetic nanoaggregates. A diblock copolymer consisted of methoxy poly(ethylene glycol) (mPEG) and poly(e-caprolactone) (PCL) was synthesized by ring-opening polymerization. Microspheres, consisted of Eudragit L100-55 encapsulate and stabilized magnetic nanoaggregates, were prepared by an oil-in-oil emulsification technique. The magnetization of the microspheres decreased, and the stability of the magnetic nanoaggregates in aqueous solutions increased as the amount of block copolymers in the microspheres increased. The encapsulated magnetic nanoaggregates were visualized by scanning electron microscopy and energy-dispersive X-ray spectroscopy. The encapsulation efficiency of nanoaggregates of the microspheres increased as the amount of diblock copolymer in the nanoaggregates was increased. The in vitro experiments confirmed the pH-dependent release of the nanoaggregates from the microspheres. The microspheres were administered to the animals by oral gavages, and the nanoaggregates in small intestines were visualized by histological examination of intestinal inner walls. Higher amounts of the block copolymer in the nanoaggregates increased the uptake efficiency in the intestinal tissues. Thus, the incorporation of the block copolymers in the magnetic nanoaggregates increased the intestinal absorption of the aggregates and Eudragit microspheres and effectively protected the nanoaggregates at low pH conditions of the stomach area.

scholarly journals Industrially-relevant polymerization-induced self-assembly formulations in non-polar solvents: RAFT dispersion polymerization of benzyl methacrylate

2015 ◽  
Vol 6 (16) ◽  
pp. 3054-3062 ◽  
Author(s):  
Matthew J. Derry ◽  
Lee A. Fielding ◽  
Steven P. Armes
Keyword(s):  
Diblock Copolymer ◽  
Self Assembly ◽  
Dispersion Polymerization ◽  
Mineral Oil ◽  
Polar Solvents ◽  
One Pot

Diblock copolymer spheres, worms and vesicles are prepared via RAFT dispersion polymerization of benzyl methacrylate in either mineral oil or a poly(α-olefin) using polymerization-induced self-assembly; an efficient ‘one-pot’ protocol is reported for spheres at 30% solids in mineral oil.

Symmetric Diblock Copolymer Thin Films on Rough Substrates. Kinetics and Structure Formation in Pure Block Copolymer Thin Films

2005 ◽  
Vol 38 (5) ◽  
pp. 1837-1849 ◽  
Author(s):  
E. Sivaniah ◽  
Y. Hayashi ◽  
S. Matsubara ◽  
S. Kiyono ◽  
T. Hashimoto ◽  
...  
Keyword(s):  
Thin Films ◽  
Block Copolymer ◽  
Structure Formation ◽  
Diblock Copolymer ◽  
Pure Block

scholarly journals Synthesis of poly(stearyl methacrylate)-poly(2-hydroxypropyl methacrylate) diblock copolymer nanoparticles via RAFT dispersion polymerization of 2-hydroxypropyl methacrylate in mineral oil

2020 ◽  
Vol 11 (28) ◽  
pp. 4579-4590 ◽  
Author(s):  
Csilla György ◽  
Saul J. Hunter ◽  
Chloé Girou ◽  
Matthew J. Derry ◽  
Steven P. Armes
Keyword(s):  
Diblock Copolymer ◽  
Dispersion Polymerization ◽  
Mineral Oil ◽  
Hydroxypropyl Methacrylate ◽  
Stearyl Methacrylate

RAFT dispersion polymerization of 2-hydroxypropyl methacrylate produces diblock copolymer spheres, worms or vesicles in mineral oil; the Pickering emulsifier performance of the spheres is examined.

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