Sphere-to-worm morphological transitions and size changes through thiol–para-fluoro core modification of PISA-made nano-objects

2020 ◽  
Vol 11 (3) ◽  
pp. 704-711 ◽  
Author(s):  
Nicolas Busatto ◽  
Joseph L. Keddie ◽  
Peter J. Roth
Keyword(s):  
Diblock Copolymer ◽  
The Core ◽  
Morphological Transitions

Spherical diblock copolymer nanoparticles became larger spheres, unimers, or worm-shaped particles when functionalised via thiol–para-fluoro substitution in the core.

scholarly journals Amphiphilic Block Copolymers Bearing Hydrophobic γ-Tocopherol Groups with Labile Acetal Bond

Polymers ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 36
Author(s):  
Shotaro Yukioka ◽  
Takuya Kitadume ◽  
Suchismita Chatterjee ◽  
Gan Ning ◽  
Tooru Ooya ◽  
...  
Keyword(s):  
Diblock Copolymer ◽  
Main Chain ◽  
Polymer Micelles ◽  
Poly Ethylene Glycol ◽  
The Core ◽  
Anticancer Effects ◽  
Acidic Conditions ◽  
High Concentrations ◽  
Poly Ethylene ◽  
Hydrophobic Cores

High concentrations of γ-tocopherol (γTCP) tend to show antioxidant, anti-inflammatory, and anticancer effects. In this study, we prepared polymer micelles under acidic conditions with a controlled release of γTCP due to the decomposition of pendant acetal bonds. First, a precursor diblock copolymer composed of poly(ethylene glycol) (PEG) and acrylic acid (AA) was prepared. This was followed by the synthesis of an amphiphilic diblock copolymer (PEG54-P(AA/VE6/γTCP29)140), incorporated into hydrophobic γTCP pendant groups attached to the main chain through an acetal bond. The prepared PEG54-P(AA/VE6/γTCP29)140 was further dispersed in water to form polymer micelles composed of hydrophobic cores that were generated from a hydrophobic block containing γTCPs and hydrophilic shells on the surface. Under acidic conditions, γTCP was then released from the core of the polymer micelles due to the decomposition of the pendant acetal bonds. In addition, polymer micelles swelled under acidic conditions due to hydration of the core.

External Potential Dynamics Simulation of Morphological Transitions in Diblock Copolymer Melt under an Electric Field

2014 ◽  
Vol 915-916 ◽  
pp. 545-548 ◽  
Author(s):  
Juan Juan Fan ◽  
Wei Li ◽  
Zhen Dong Pan ◽  
Min Fei Shi
Keyword(s):  
Electric Field ◽  
External Electric Field ◽  
Diblock Copolymer ◽  
External Potential ◽  
Dynamics Simulation ◽  
Morphological Transitions ◽  
Cylindrical Phase

In this study, we study morphological transitions of diblock copolymer subjected to an applied external electric field by means of external potential dynamics simulation. With this method, the lamellar and the cylindrical phase aligned along the electric field directions are presented, and the kinetic pathways of lamellae are investigated.

Morphologies in Blends of Diblock Copolymer and Homopolymer: Morphology Diagrams and the Intermaterial Dividing Surface

1991 ◽  
Vol 248 ◽  
Author(s):  
Karen I. Winey
Keyword(s):  
Molecular Weight ◽  
Diblock Copolymer ◽  
Mean Curvature ◽  
Morphological Data ◽  
Copolymer Composition ◽  
Binary Blends ◽  
Morphological Transitions ◽  
The Mean ◽  
Dividing Surface ◽  
Double Diamond

AbstractBinary blends of diblock copolymer (AB) and homopolymer (hA) self assemble upon solvent evaporation into a great variety of microphase separated morphologies. The ordered lamellar, bicontinuous double diamond, cylindrical and spherical morphologies were observed by TEM and SAXS in our studies, as well as a range of micellar morphologies.The mean curvature (H) and the area per copolymer junction (σj), which characterize the intermaterial dividing surface, increased with increasing homopolymer concentration in the blend and/or with decreasing homopolymer molecular weight. These trends were generally obeyed both between and within ordered morphology types. The increase in H and σj was related to an increased degree of mixing between the homopolymer and the block of the copolymer.Two types of isothermal morphology diagrams were constructed to consolidate the extensive morphological data and to illustrate the general morphological transitions in AB/hA blends. The constant molecular weight morphology diagrams illustrated the interdependence of the copolymer composition and the homopolymer concentration. The constant copolymer composition diagrams emphasized the importance of the relative homopolymer molecular weight and the overall blend composition.

scholarly journals Order–Order Morphological Transitions for Dual Stimulus Responsive Diblock Copolymer Vesicles

2016 ◽  
Vol 49 (3) ◽  
pp. 1016-1025 ◽  
Author(s):  
Joseph R. Lovett ◽  
Nicholas J. Warren ◽  
Steven P. Armes ◽  
Mark J. Smallridge ◽  
Robert B. Cracknell
Keyword(s):  
Diblock Copolymer ◽  
Stimulus Responsive ◽  
Morphological Transitions

scholarly journals Semi-crystalline diblock copolymer nano-objects prepared via RAFT alcoholic dispersion polymerization of stearyl methacrylate

2015 ◽  
Vol 6 (10) ◽  
pp. 1751-1757 ◽  
Author(s):  
Mona Semsarilar ◽  
Nicholas J. W. Penfold ◽  
Elizabeth R. Jones ◽  
Steven P. Armes
Keyword(s):  
Diblock Copolymer ◽  
Self Assembly ◽  
Dispersion Polymerization ◽  
Local Order ◽  
Dsc Studies ◽  
The Core ◽  
Stearyl Methacrylate

Semi-crystalline diblock copolymer spheres, worms or vesicles are prepared by polymerization-induced self-assembly via RAFT dispersion polymerization of stearyl methacrylate. DSC studies confirm local order for the core-forming poly(stearyl methacrylate) chains.

MONTE CARLO SIMULATION OF SELF-ASSEMBLED AMPHIPHILIC DIBLOCK COPOLYMER IN SOLUTION

2003 ◽  
Vol 17 (01n02) ◽  
pp. 241-244 ◽  
Author(s):  
PINGCHUAN SUN ◽  
YUHUA YIN ◽  
BAOHUI LI ◽  
QINGHUA JIN ◽  
DATONG DING
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Diblock Copolymer ◽  
Self Assembly ◽  
Diblock Copolymers ◽  
The Self ◽  
Amphiphilic Diblock Copolymer ◽  
The Core ◽  
Spherical Micelles ◽  
The Given

In this paper, Monte Carlo method is applied to simulate the process of the self-assembly of amphiphilic diblock copolymer with a series of block lengths of the insoluble and soluble blocks. Under the given simulation conditions, the diblock copolymers form spherical micelles in solution. The dependence of the core radii of spherical micelles on both block lengths is obtained and compared with experimental results of Eisenberg and coworkers.

Interfacial change on morphological transitions in styrene–isoprene diblock copolymer

2009 ◽  
Vol 45 (8) ◽  
pp. 2450-2454 ◽  
Author(s):  
Jong-Eun Kim ◽  
Wang-Cheol Zin ◽  
Jong-Hyun Ahn
Keyword(s):  
Diblock Copolymer ◽  
Morphological Transitions

scholarly journals RAFT polymerization of hydroxy-functional methacrylic monomers under heterogeneous conditions: effect of varying the core-forming block

2014 ◽  
Vol 5 (11) ◽  
pp. 3643-3655 ◽  
Author(s):  
L. P. D. Ratcliffe ◽  
A. Blanazs ◽  
C. N. Williams ◽  
S. L. Brown ◽  
S. P. Armes
Keyword(s):  
Diblock Copolymer ◽  
Raft Polymerization ◽  
The Core ◽  
Responsive Behavior ◽  
Methacrylic Monomers

Do isomeric core-forming blocks afford the same thermo-responsive behavior for diblock copolymer worm gels?

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