scholarly journals Effects of Chemical Modifications on the Thermoresponsive Behavior of a PDMAEA-b-PNIPAM-b-POEGA Triblock Terpolymer

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1382 ◽  
Author(s):  
Despoina Giaouzi ◽  
Stergios Pispas
Keyword(s):  
Self Assembly ◽  
Raft Polymerization ◽  
Aqueous Media ◽  
Size Exclusion ◽  
Solution Temperature ◽  
The Novel ◽  
Chemical Modifications ◽  
Solution Ph ◽  
Assembly Behavior ◽  
Triblock Terpolymers

In this work, the synthesis, selective chemical modifications, and self-assembly behavior in aqueous media of a novel poly(2-(dimethylamino)ethyl acrylate)20-b-poly(N-isopropylacrylamide)11-b-poly(oligo ethylene glycol methyl ether acrylate)18 (PDMAEA20-b-PNIPAM11-b-POEGA18) dual-responsive (pH and temperature) and triply hydrophilic amino-based triblock terpolymer are reported. The amine functional triblock terpolymer was synthesized by sequential reversible addition fragmentation chain transfer polymerization (RAFT) polymerization and molecularly characterized by size exclusion chromatography (SEC) and 1H-NMR spectroscopy that evidenced the success of the three-step polymerization scheme. The tertiary amine pendant groups of the PDMAEA block were chemically modified in order to produce the Q1PDMAEA20-b-PNIPAM11-b-POEGA18 as well as the Q6PDMAEA20-b-PNIPAM11-b-POEGA18 quaternized triblock terpolymers (Q1 and Q6 prefixes show the number of carbon atoms (C1 and C6) attached on the PDMAEA groups) using methyl iodide (CH3I) and 1-iodohexane (C6H13I) as the quaternizing agents and the SPDMAEA20-b-PNIPAM11-b-POEGA18 sulfobetainized triblock terpolymer using 1,3 propanesultone (C3H6O3S) as the sulfobetainization agent. The self-assembly properties of the triblock terpolymers in aqueous solutions upon varying temperature and solution pH were studied by light scattering and fluorescence spectroscopy experiments. The novel triblock terpolymers self-assemble into nanosized aggregates upon solution temperature rise above the nominal lower critical solution temperature (LCST) of the temperature-responsive PNIPAM block. The remarkable stimuli-responsive self-assembly behavior of the novel triblock terpolymers in aqueous media make them interesting candidates for biomedical applications in the fields of drug and gene delivery.

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.

PDMAEMA-b-PLMA-b-POEGMA triblock terpolymers via RAFT polymerization and their self-assembly in aqueous solutions

2017 ◽  
Vol 8 (31) ◽  
pp. 4538-4547 ◽  
Author(s):  
Athanasios Skandalis ◽  
Stergios Pispas
Keyword(s):  
Aqueous Solutions ◽  
Self Assembly ◽  
Raft Polymerization ◽  
Aqueous Media ◽  
Spherical Micelles ◽  
Triblock Terpolymers

Novel PDMAEMA-b-PLMA-b-POEGMA triblock terpolymers were synthesized by RAFT polymerization. Triblock polyelectrolytes were obtained by quaternization. PDMAEMA-b-PLMA-b-POEGMA and QPDMAEMA-b-PLMA-b-POEGMA terpolymers self-assemble into spherical micelles with a mixed corona in aqueous media.

scholarly journals Synthesis of amphiphilic copolymers based on acrylic acid, fluoroalkyl acrylates and n-butyl acrylate in organic, aqueous–organic, and aqueous media via RAFT polymerization

RSC Advances ◽  
2017 ◽  
Vol 7 (39) ◽  
pp. 24522-24536 ◽  
Author(s):  
N. S. Serkhacheva ◽  
O. I. Smirnov ◽  
A. V. Tolkachev ◽  
N. I. Prokopov ◽  
A. V. Plutalova ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Polyacrylic Acid ◽  
Self Assembly ◽  
Butyl Acrylate ◽  
Raft Polymerization ◽  
Aqueous Media ◽  
Amphiphilic Copolymers

Hydrophilic and amphiphilic polymeric trithiocarbonates based on polyacrylic acid are able to provide polymerization-induced self-assembly in copolymerization of butyl and fluoroalkyl acrylates.

Self-assembly behavior of pH- and thermo-responsive hydrophilic ABCBA-type pentablock copolymers synthesized by consecutive RAFT polymerization

RSC Advances ◽  
2013 ◽  
Vol 3 (35) ◽  
pp. 15085 ◽  
Author(s):  
Jiucun Chen ◽  
Mingzhu Liu ◽  
Chunmei Gao ◽  
Shaoyu Lü ◽  
Xinyu Zhang ◽  
...  
Keyword(s):  
Self Assembly ◽  
Raft Polymerization ◽  
Pentablock Copolymers ◽  
Assembly Behavior

scholarly journals Fully Fused Boron-Doped Polycyclic Aromatic Hydrocarbons: Their Synthesis, Structure–Property Relationships, and Self-Assembly Behavior in Aqueous Media

2022 ◽  
Author(s):  
Hiroki Narita ◽  
Heekyoung Choi ◽  
Masato Ito ◽  
Naoki Ando ◽  
Soichiro Ogi ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Self Assembly ◽  
Aqueous Media ◽  
Structure Property ◽  
Organic Optoelectronics ◽  
Structure Property Relationships ◽  
Boron Doped ◽  
Polycyclic Aromatic ◽  
Assembly Behavior

Planarized triarylboranes are attracting increasing attention not only as models of boron-doped graphenes, but also as promising materials for organic optoelectronics. In particular, polycyclic aromatic hydrocarbon (PAH) skeletons with embedded...

An Hg2+-selective chemosensor based on the self-assembly of a novel amphiphilic block copolymer bearing rhodamine 6G derivative moieties in purely aqueous media

2015 ◽  
Vol 7 (6) ◽  
pp. 2738-2746 ◽  
Author(s):  
Zhao Wang ◽  
Zhongkui Yang ◽  
Tao Gao ◽  
Jingwen He ◽  
Laijiang Gong ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Self Assembly ◽  
Rhodamine 6G ◽  
Raft Polymerization ◽  
Aqueous Media ◽  
The Self ◽  
Amphiphilic Block Copolymer ◽  
Fluorescent Chemosensor

An amphiphilic block copolymer-based colorimetric and fluorescent chemosensor for Hg2+was prepared, which was synthesized by sequential RAFT polymerization of NIPAM and R6GDM (a novel Hg2+-sensitive rhodamine monomer).

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