Synthesis and Self-Assembly of the Organic−Organometallic Diblock Copolymer Poly(isoprene-b-ferrocenylphenylphosphine):  Shell Cross-Linking and Coordination Chemistry of Nanospheres with a Polyferrocene Core

2001 ◽  
Vol 34 (10) ◽  
pp. 3353-3360 ◽  
Author(s):  
Lan Cao ◽  
Ian Manners ◽  
Mitchell A. Winnik
Keyword(s):  
Coordination Chemistry ◽  
Diblock Copolymer ◽  
Self Assembly ◽  
Cross Linking ◽  
Copolymer Poly

Synthesis of poly(methyl methacrylate)-b-poly(acrylic acid) by DPE method

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Dong Chen ◽  
Ruixue Liu ◽  
Zhifeng Fu ◽  
Yan Shi
Keyword(s):  
Molecular Weight ◽  
Acrylic Acid ◽  
Methyl Methacrylate ◽  
Diblock Copolymer ◽  
Self Assembly ◽  
Gel Permeation Chromatography ◽  
Amphiphilic Diblock Copolymer ◽  
Poly Methyl Methacrylate ◽  
Copolymer Poly ◽  
Poly Acrylic Acid

AbstractAmphiphilic diblock copolymer poly(methyl methacrylate)-b-poly(acrylic acid) (PMMA-b-PAA) was prepared by 1,1-diphenylethene (DPE) method. Firstly, free radical polymerization of methyl methacrylate was carried out with AIBN as initiator in the presence of DPE, giving a DPE-containing PMMA precursor with controlled molecular weight. tert-Butyl acrylate (tBA) was then polymerized in the presence of the PMMA precursor, and PMMA-b-PtBA diblock copolymer with controlled molecular weight was prepared. Finally, amphiphilic diblock copolymer PMMA-b-PAA was obtained by hydrolysis of PMMA-b-PtBA. The formation of PMMA-b-PAA was confirmed by 1H NMR spectrum and gel permeation chromatography. Transmission electron microscopy and dynamic light scattering were used to detect the self-assembly behavior of the amphiphilic diblock polymers in methanol.

scholarly journals Preparation and Cross-Linking of All-Acrylamide Diblock Copolymer Nano-Objects via Polymerization-Induced Self-Assembly in Aqueous Solution

2017 ◽  
Vol 50 (4) ◽  
pp. 1482-1493 ◽  
Author(s):  
Sarah J. Byard ◽  
Mark Williams ◽  
Beulah E. McKenzie ◽  
Adam Blanazs ◽  
Steven P. Armes
Keyword(s):  
Aqueous Solution ◽  
Diblock Copolymer ◽  
Self Assembly ◽  
Cross Linking

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 Hierarchical supramolecular assembly of a single peptoid polymer into a planar nanobrush with two distinct molecular packing motifs

2020 ◽  
Vol 117 (50) ◽  
pp. 31639-31647
Author(s):  
Jing Sun ◽  
Zhiwei Wang ◽  
Chenhui Zhu ◽  
Meiyao Wang ◽  
Zhekun Shi ◽  
...  
Keyword(s):  
Diblock Copolymer ◽  
Self Assembly ◽  
Elevated Temperatures ◽  
Protein Crystallization ◽  
Supramolecular Assembly ◽  
Molecular Packing ◽  
One Pot ◽  
Precise Control ◽  
Assembly Mechanism ◽  
Copolymer Poly

Hierarchical nanomaterials have received increasing interest for many applications. Here, we report a facile programmable strategy based on an embedded segmental crystallinity design to prepare unprecedented supramolecular planar nanobrush-like structures composed of two distinct molecular packing motifs, by the self-assembly of one particular diblock copolymer poly(ethylene glycol)-block-poly(N-octylglycine) in a one-pot preparation. We demonstrate that the superstructures result from the temperature-controlled hierarchical self-assembly of preformed spherical micelles by optimizing the crystallization−solvophobicity balance. Particularly remarkable is that these micelles first assemble into linear arrays at elevated temperatures, which, upon cooling, subsequently template further lateral, crystallization-driven assembly in a living manner. Addition of the diblock copolymer chains to the growing nanostructure occurs via a loosely organized micellar intermediate state, which undergoes an unfolding transition to the final crystalline state in the nanobrush. This assembly mechanism is distinct from previous crystallization-driven approaches which occur via unimer addition, and is more akin to protein crystallization. Interestingly, nanobrush formation is conserved over a variety of preparation pathways. The precise control ability over the superstructure, combined with the excellent biocompatibility of polypeptoids, offers great potential for nanomaterials inaccessible previously for a broad range of advanced applications.

A polymerization-induced self-assembly process for all-styrenic nano-objects using the living anionic polymerization mechanism

2020 ◽  
Vol 11 (15) ◽  
pp. 2635-2639 ◽  
Author(s):  
Chengcheng Zhou ◽  
Jian Wang ◽  
Peng Zhou ◽  
Guowei Wang
Keyword(s):  
Diblock Copolymer ◽  
Anionic Polymerization ◽  
Self Assembly ◽  
Assembly Process ◽  
Living Anionic Polymerization ◽  
Polymerization Mechanism ◽  
Copolymer Poly

By combination of the living anionic polymerization (LAP) mechanism with the polymerization-induced self-assembly (PISA) technique, the all-styrenic diblock copolymer poly(p-tert-butylstyrene)-b-polystyrene (PtBS-b-PS) based LAP PISA was successfully developed.

Multilayer composite beads constructed via layer-by-layer self-assembly for lysozyme controlled release

RSC Advances ◽  
2014 ◽  
Vol 4 (46) ◽  
pp. 24369-24376 ◽  
Author(s):  
Jiemin Zhao ◽  
Xiaoping Wang ◽  
Yanshen Kuang ◽  
Yufeng Zhang ◽  
Xiaowen Shi ◽  
...  
Keyword(s):  
Controlled Release ◽  
Self Assembly ◽  
Cross Linking ◽  
Layer By Layer ◽  
Multilayer Composite ◽  
Composite Beads ◽  
Assembly Technique ◽  
Positively Charged

Alginate (ALG)–lysozyme (LZ) beads were fabricated by a cross-linking process. Negatively charged ALG and positively charged LZ were alternately deposited on the positively charged ALG–LZ beads via a layer-by-layer (LBL) self-assembly technique.

Synthesis of a doubly thermo-responsive schizophrenic diblock copolymer based on poly[N-(4-vinylbenzyl)-N,N-diethylamine] and its temperature-sensitive flip-flop micellization

2014 ◽  
Vol 5 (12) ◽  
pp. 3910-3918 ◽  
Author(s):  
Shentong Li ◽  
Fei Huo ◽  
Quanlong Li ◽  
Chengqiang Gao ◽  
Yang Su ◽  
...  
Keyword(s):  
Diblock Copolymer ◽  
Butyl Methacrylate ◽  
Temperature Sensitive ◽  
Flip Flop ◽  
Copolymer Poly

A doubly thermo-responsive schizophrenic diblock copolymer, poly(tert-butyl methacrylate)-block-poly[N-(4-vinylbenzyl)-N,N-diethylamine], was synthesized and its flip-flop micellization was demonstrated.

Inside Front Cover: Self-Assembly of Diblock-Copolymer Micelles for Template-Based Preparation of PbTiO3 Nanograins (Adv. Funct. Mater. 18/2006)

2006 ◽  
Vol 16 (18) ◽  
pp. NA-NA
Author(s):  
S. Kronholz ◽  
S. Rathgeber ◽  
S. Karthäuser ◽  
H. Kohlstedt ◽  
S. Clemens ◽  
...  
Keyword(s):  
Diblock Copolymer ◽  
Self Assembly ◽  
Front Cover ◽  
Copolymer Micelles
Sign in / Sign up

Export Citation Format

Share Document