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?

Synthesis of azobenzene-containing side chain liquid crystalline diblock copolymers using RAFT polymerization and photo-responsive behavior

2013 ◽  
Vol 130 (3) ◽  
pp. 2165-2175 ◽  
Author(s):  
Wuqiong Sun ◽  
Xiaohua He ◽  
Xiaojuan Liao ◽  
Shaoliang Lin ◽  
Wei Huang ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Diblock Copolymers ◽  
Raft Polymerization ◽  
Side Chain ◽  
Responsive Behavior

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.

Effects of copolymer concentration and chain length on the pH-responsive behavior of diblock copolymer micellar films

2006 ◽  
Vol 303 (2) ◽  
pp. 372-379 ◽  
Author(s):  
Kenichi Sakai ◽  
Emelyn G. Smith ◽  
Grant B. Webber ◽  
Erica J. Wanless ◽  
Vural Bütün ◽  
...  
Keyword(s):  
Chain Length ◽  
Diblock Copolymer ◽  
Ph Responsive ◽  
Copolymer Concentration ◽  
Responsive Behavior

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.

scholarly journals Synthesis and Self-Assembly of Multistimulus-Responsive Azobenzene-Containing Diblock Copolymer through RAFT Polymerization

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2028
Author(s):  
Po-Chih Yang ◽  
Yueh-Han Chien ◽  
Shih-Hsuan Tseng ◽  
Chia-Chung Lin ◽  
Kai-Yu Huang
Keyword(s):  
Uv Irradiation ◽  
Diblock Copolymer ◽  
Self Assembly ◽  
Raft Polymerization ◽  
Solution Temperature ◽  
Micellar Aggregates ◽  
Before And After ◽  
Assembly Behavior ◽  
Copolymer Poly ◽  
Polymer Aqueous Solution

This paper gathered studies on multistimulus-responsive sensing and self-assembly behavior of a novel amphiphilic diblock copolymer through a two-step reverse addition-fragmentation transfer (RAFT) polymerization technique. N-Isopropylacrylamide (NIPAM) macromolecular chain transfer agent and diblock copolymer (poly(NIPAM-b-Azo)) were discovered to have moderate thermal decomposition temperatures of 351.8 and 370.8 °C, respectively, indicating that their thermal stability was enhanced because of the azobenzene segments incorporated into the block copolymer. The diblock copolymer was determined to exhibit a lower critical solution temperature of 34.4 °C. Poly(NIPAM-b-Azo) demonstrated a higher photoisomerization rate constant (kt = 0.1295 s−1) than the Azo monomer did (kt = 0.088 s−1). When ultraviolet (UV) irradiation was applied, the intensity of fluorescence gradually increased, suggesting that UV irradiation enhanced the fluorescence of self-assembled cis-isomers of azobenzene. Morphological aggregates before and after UV irradiation are shown in scanning electron microscopy (SEM) and dynamic light scattering (DLS) analyses of the diblock copolymer. We employed photoluminescence titrations to reveal that the diblock copolymer was highly sensitive toward Ru3+ and Ba2+, as was indicated by the crown ether acting as a recognition moiety between azobenzene units. Micellar aggregates were formed in the polymer aqueous solution through dissolution; their mean diameters were approximately 205.8 and 364.6 nm at temperatures of 25.0 and 40.0 °C, respectively. Our findings contribute to research on photoresponsive and chemosensory polymer material developments.

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