scholarly journals Self-Assembly of Linear Amphiphilic Pentablock Terpolymer PAAx-PS48-PEO46-PS48-PAAxin Dilute Aqueous Solution

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2183
Author(s):  
Jia Gao ◽  
Kun An ◽  
Chao Lv ◽  
Jingjing Nie ◽  
Junting Xu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Zeta Potential ◽  
Self Assembly ◽  
Potential Measurement ◽  
Transmission Electron ◽  
Dilute Aqueous Solution ◽  
Dilute Aqueous Solutions ◽  
Poly Ethylene Oxide ◽  
Spherical Micelles ◽  
Poly Ethylene

A series of linear amphiphilic pentablock terpolymer PAAx-b-PS48-b-PEO46-b-PS48-b-PAAx (AxS48O46S48Ax) with various lengths x of the PAA block (x = 15, 40, 60, and 90) were synthesized via a two-step atom transfer radical polymerization (ATRP) using Br-poly(ethylene oxide)-Br (Br-PEO46-Br) as the macroinitiator, styrene (St) as the first monomer, and tert-butyl acrylate (tBA) as the second monomer, followed with the hydrolysis of PtBA blocks. The AxS48O46S48Ax pentablock terpolymers formed micelles in dilute aqueous solution, of which the morphologies were dependent on the length x of the PAA block. Cryogenic transmission electron microscopy (cryo-TEM), dynamic light scattering (DLS), and zeta potential measurement were employed to investigate the morphologies, chain structures, size, and size distribution of the obtained micelles. The morphology of AxS48O46S48Ax micelles changed from spherical vesicles with ordered porous membranes to long double nanotubes, then to long nanotubes with inner modulated nanotubes or short nanotubes, and finally, to spherical micelles or large compound vesicles with spherical micelles inside when x increased from 15 to 90. The hydrophobic PS blocks formed the walls of vesicles and nanotubes as well as the core of spherical micelles. The hydrophilic PEO and PAA block chains were located on the surfaces of vesicle membranes, nanotubes, and spherical micelles. The PAA block chains were partially ionized, leading to the negative zeta potential of AxS48O46S48Ax micelles in dilute aqueous solutions.

Synthesis and Self-Assembly Study of Biodegradable Amphiphilic Triblock Copolymers with PEG Block

2014 ◽  
Vol 998-999 ◽  
pp. 95-98
Author(s):  
Xu Du ◽  
Qin Wang ◽  
Chuan Dong Wang ◽  
Yang Liu
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Ethylene Glycol ◽  
Self Assembly ◽  
Triblock Copolymers ◽  
Poly Ethylene Glycol ◽  
Chemical Structures ◽  
Transmission Electron ◽  
Spherical Micelles ◽  
Poly Ethylene

Three biodegradable amphiphilic triblock copolymers: polylactide-poly (ethylene glycol)-polylactide (PLA-PEG-PLA), poly (ε-caprolactone)-poly (ethylene glycol)-poly (ε-caprolactone) (PCL-PEG-PCL) and poly (lactide-glycolide)-poly (ethylene glycol)-poly (lactide-glycolide) (PLGA-PEG-PLGA) were synthesized. Their chemical structures were characterized. In aqueous solution, their self-assembly and degradation were studied by dynamic light scattering (DLS) and transmission electron microscopy (TEM). Spherical micelles were formed in aqueous solution via self-assembly of the amphiphilic triblock copolymers. After degradation, the PLA-PEG-PLA and PCL-PEG-PCL micelles became smaller and the PLGA-PEG-PLGA micelles change to vesicles, which should mainly attribute to their different degradation speed.

Mixed Self-Assembly of Poly(ethylene oxide)-b-poly(ε-caprolactone) Copolymers and Sodium Dodecyl Sulfate in Aqueous Solution

Langmuir ◽  
2004 ◽  
Vol 20 (21) ◽  
pp. 9019-9028 ◽  
Author(s):  
P. Vangeyte ◽  
B. Leyh ◽  
L. Auvray ◽  
J. Grandjean ◽  
A.-M. Misselyn-Bauduin ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Sodium Dodecyl Sulfate ◽  
Ethylene Oxide ◽  
Self Assembly ◽  
Sodium Dodecyl ◽  
Dodecyl Sulfate ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

scholarly journals Nanostructures by self-assembly of polyglycidol-derivatized lipids

RSC Advances ◽  
2014 ◽  
Vol 4 (70) ◽  
pp. 37208-37219 ◽  
Author(s):  
Pavel Bakardzhiev ◽  
Stanislav Rangelov ◽  
Barbara Trzebicka ◽  
Denitsa Momekova ◽  
Georgi Lalev ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Self Assembly ◽  
Lamellar Structures ◽  
Dilute Aqueous Solution ◽  
Spherical Micelles

Polyglycidol-derivatized lipids were successfully prepared and their self-assembly in dilute aqueous solution into spherical micelles and lamellar structures was investigated.

Difference in dilute aqueous solution behavior between poly(ethylene glycol) and poly(ethylene oxide)

2017 ◽  
Vol 50 (3) ◽  
pp. 231-237 ◽  
Author(s):  
Akihisa Nakamura ◽  
Yutaka Aoki ◽  
Masashi Osa ◽  
Daichi Ida ◽  
Takenao Yoshizaki
Keyword(s):  
Aqueous Solution ◽  
Ethylene Oxide ◽  
Ethylene Glycol ◽  
Poly Ethylene Glycol ◽  
Solution Behavior ◽  
Dilute Aqueous Solution ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

scholarly journals Self-Assembly of Poly(ethylene oxide)-b-poly(ε-caprolactone) Copolymers in Aqueous Solution

Langmuir ◽  
2004 ◽  
Vol 20 (20) ◽  
pp. 8442-8451 ◽  
Author(s):  
P. Vangeyte ◽  
B. Leyh ◽  
M. Heinrich ◽  
J. Grandjean ◽  
C. Bourgaux ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Ethylene Oxide ◽  
Self Assembly ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

scholarly journals pH-Dependence of the morphology of micelles formed by poly(2-vinylpyridine)-block-poly(ethylene oxide) copolymers in water

e-Polymers ◽  
2002 ◽  
Vol 2 (1) ◽  
Author(s):  
Jean-François Gohy ◽  
Sandrine Mores ◽  
Sunil K. Varshney ◽  
Jian-Xin Zhang ◽  
Robert Jérôme
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Ethylene Oxide ◽  
Ph Dependence ◽  
Minor Component ◽  
Transmission Electron ◽  
Poly Ethylene Oxide ◽  
Spherical Micelles ◽  
Poly Ethylene ◽  
Ph Range

AbstractThe morphology of micelles formed by two poly(2-vinylpyridine)-blockpoly( ethylene oxide) (P2VP-b-PEO) copolymers has been studied in phosphatebuffered water by dynamic light scattering and transmission electron microscopy. Spherical micelles are observed when the P2VP block is the minor component of the diblock copolymer. When P2VP dominates the composition, transition from spheres-to-rods-to-vesicles takes place in a narrow pH range that straddles the pKa of P2VP. This transition is controlled by the degree of protonation of the P2VP blocks. At high pH, the copolymer precipitates from the solution.

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