In situ synthesis of diblock copolymer nano-assemblies via dispersion RAFT polymerization induced self-assembly and Ag/copolymer composite nanoparticles thereof

2018 ◽  
Vol 9 (9) ◽  
pp. 1082-1094 ◽  
Author(s):  
Mengting Tan ◽  
Yan Shi ◽  
Zhifeng Fu ◽  
Wantai Yang
Keyword(s):  
Diblock Copolymer ◽  
Self Assembly ◽  
Raft Polymerization ◽  
In Situ Synthesis ◽  
Composite Nanoparticles ◽  
Water Mixture

Lacunal nanospheres were obtained through the dispersion of styrene in an ethanol/water mixture mediated by PAA-CTA, while pure vesicles were obtained for PAA-b-P(AA-r-St) block assemblies under similar conditions.

The in situ formation of nanoparticles via RAFT polymerization-induced self-assembly in a continuous tubular reactor

2017 ◽  
Vol 8 (9) ◽  
pp. 1495-1506 ◽  
Author(s):  
Jinying Peng ◽  
Chun Tian ◽  
Lifen Zhang ◽  
Zhenping Cheng ◽  
Xiulin Zhu
Keyword(s):  
Ethylene Glycol ◽  
Diblock Copolymer ◽  
Self Assembly ◽  
Raft Polymerization ◽  
Tubular Reactor ◽  
Poly Ethylene Glycol ◽  
In Situ Formation ◽  
Poly Ethylene ◽  
Glycol Methyl Ether

Amphiphilic poly(poly(ethylene glycol)methyl ether methacrylate)-b-poly(methyl methacrylate) (PPEGMA-b-PMMA) diblock copolymer nanoparticles were successfully synthesized via polymerization-induced self-assembly (PISA) at 70 °C in a continuous tubular reactor.

In situ synthesis of a self-assembled AB/B blend of poly(ethylene glycol)-b-polystyrene/polystyrene by dispersion RAFT polymerization

2017 ◽  
Vol 8 (14) ◽  
pp. 2173-2181 ◽  
Author(s):  
Bing Yuan ◽  
Xin He ◽  
Yaqing Qu ◽  
Chengqiang Gao ◽  
Erika Eiser ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Diblock Copolymer ◽  
Raft Polymerization ◽  
In Situ Synthesis ◽  
Poly Ethylene Glycol ◽  
Self Assembled ◽  
Poly Ethylene

A diblock-copolymer/homopolymer self-assembled blend was synthesized through dispersion RAFT polymerization, and its morphology changed with a decreasing ratio of diblock-copolymer/homopolymer.

In situ synthesis of the Ag/poly(4-vinylpyridine)-block-polystyrene composite nanoparticles by dispersion RAFT polymerization

2017 ◽  
Vol 8 (20) ◽  
pp. 3203-3210 ◽  
Author(s):  
Hui Liu ◽  
Mingdu Ding ◽  
Zhonglin Ding ◽  
Chengqiang Gao ◽  
Wangqing Zhang
Keyword(s):  
Block Copolymer ◽  
Ag Nanoparticles ◽  
Raft Polymerization ◽  
In Situ Synthesis ◽  
New Method ◽  
Composite Nanoparticles ◽  
Metal Block

A new method for the synthesis of metal/block-copolymer nanocomposites of poly(4-vinylpyridine)-b-polystyrene (P4VP-b-PS) and Ag nanoparticles by dispersion RAFT polymerization is proposed.

In situ synthesis of a C-doped (BiO)2CO3 hierarchical self-assembly effectively promoting visible light photocatalysis

2015 ◽  
Vol 3 (11) ◽  
pp. 6118-6127 ◽  
Author(s):  
Ting Xiong ◽  
Hongwei Huang ◽  
Yanjuan Sun ◽  
Fan Dong
Keyword(s):  
Photocatalytic Activity ◽  
Structural Optimization ◽  
Visible Light ◽  
Self Assembly ◽  
In Situ Synthesis ◽  
Carbon Doping ◽  
Visible Light Photocatalysis ◽  
Visible Photocatalytic Activity

By combination of carbon doping and structural optimization, C-doped (BiO)2CO3 microspheres exhibited highly enhanced and stable visible photocatalytic activity.

In-situ visualization and order quantification of symmetric diblock copolymer directed self-assembly

2013 ◽  
Vol 543 ◽  
pp. 148-152 ◽  
Author(s):  
M. Salaün ◽  
M. Le Gallic ◽  
E. Picard ◽  
M. Zelsmann
Keyword(s):  
Diblock Copolymer ◽  
Self Assembly ◽  
In Situ Visualization

scholarly journals Synthesis of Poly(3-vinylpyridine)-Block-Polystyrene Diblock Copolymers via Surfactant-Free RAFT Emulsion Polymerization

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3145 ◽  
Author(s):  
Katharina Nieswandt ◽  
Prokopios Georgopanos ◽  
Clarissa Abetz ◽  
Volkan Filiz ◽  
Volker Abetz
Keyword(s):  
Emulsion Polymerization ◽  
Self Assembly ◽  
Diblock Copolymers ◽  
Chain Transfer ◽  
Raft Polymerization ◽  
Free Water ◽  
Monomer Conversion ◽  
Molecular Weights ◽  
Reversible Addition

In this work, we present a novel synthetic route to diblock copolymers based on styrene and 3-vinylpyridine monomers. Surfactant-free water-based reversible addition–fragmentation chain transfer (RAFT) emulsion polymerization of styrene in the presence of the macroRAFT agent poly(3-vinylpyridine) (P3VP) is used to synthesize diblock copolymers with molecular weights of around 60 kDa. The proposed mechanism for the poly(3-vinylpyridine)-block-poly(styrene) (P3VP-b-PS) synthesis is the polymerization-induced self-assembly (PISA) which involves the in situ formation of well-defined micellar nanoscale objects consisting of a PS core and a stabilizing P3VP macroRAFT agent corona. The presented approach shows a well-controlled RAFT polymerization, allowing for the synthesis of diblock copolymers with high monomer conversion. The obtained diblock copolymers display microphase-separated structures according to their composition.

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.

scholarly journals In situ small-angle X-ray scattering studies of sterically-stabilized diblock copolymer nanoparticles formed during polymerization-induced self-assembly in non-polar media

2016 ◽  
Vol 7 (8) ◽  
pp. 5078-5090 ◽  
Author(s):  
Matthew J. Derry ◽  
Lee A. Fielding ◽  
Nicholas J. Warren ◽  
Charlotte J. Mable ◽  
Andrew J. Smith ◽  
...  
Keyword(s):  
Diblock Copolymer ◽  
Small Angle ◽  
Self Assembly ◽  
Mineral Oil ◽  
X Ray ◽  
X Ray Scattering ◽  
Polar Media ◽  
Ray Scattering

In situ SAXS studies reveal the evolution of copolymer morphology during the PISA synthesis of diblock copolymer nano-objects in mineral oil.

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