Gas permeation properties of polymer membranes containing ethylene glycol monomers

2017 ◽  
Vol 29 (2) ◽  
pp. 237-245 ◽  
Author(s):  
Jujie Luo ◽  
Xiaoqi He ◽  
Ziqin Si
Keyword(s):  
Ethylene Glycol ◽  
Gas Permeation ◽  
Proton Nuclear Magnetic Resonance ◽  
Resonance Spectroscopy ◽  
Separation Membranes ◽  
Gas Separation Membranes ◽  
Different Temperatures ◽  
Poly Ethylene ◽  
Separation Performances ◽  
Different Content

Copolymers based on glassy and rubbery units have been developed to take advantage of both domains to enhance solubility and diffusivity. In this study, a series of gas separation membranes from poly(ether sulfone)s containing ethylene glycol were synthesized via nucleophilic substitution polycondensation. The structures of copolymers were confirmed by proton nuclear magnetic resonance spectroscopy and Fourier transform infrared spectra. The permeability and selectivity of the membranes were studied at different temperatures of 25–55°C and pressures of 0.5–1.5 atm using single gases, such as carbon dioxide (CO2) and nitrogen (N2). Gas permeation measurements showed that copolymers with different content of poly(ethylene glycol) (PEG) exhibited different separation performances. For example, the membrane from polysulfone–PEG-20 containing 20 wt% PEG showed a better performance in terms of ideal selectivity over the other three copolymers membranes. The highest ideal CO2/N2 selectivity was 66.8 with CO2 permeability of 6.4 barrer at 1.5 atm and 25°C.

Nano Aggregate Formation Through Self-Assembly of Poly(L-lysine)-Block-Poly(γ-benzyl-L-glutamate)-Graft-Poly(ethylene glycol) Copolymer

2020 ◽  
Vol 20 (11) ◽  
pp. 6968-6974
Author(s):  
Yu Zhang ◽  
Wenliang Song ◽  
Il Kim
Keyword(s):  
Ethylene Glycol ◽  
Volume Content ◽  
Self Assembly ◽  
Gel Permeation Chromatography ◽  
Deionized Water ◽  
Proton Nuclear Magnetic Resonance ◽  
Resonance Spectroscopy ◽  
Exchange Reactions ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene

Polymeric nano aggregates based on poly(L-lysine)-block-PBLG-graft-poly(ethylene glycol) (PLL-b-PBLG-g-PEG) copolymers were prepared by a dialysis method in deionized water. PLL-b-PBLG-g-PEG copolymers with different degrees of PEG substitution were synthesized by combining the ring-opening polymerization of α-amino acid N-carboxyanhydrides and ester exchange reactions. Proton nuclear magnetic resonance spectroscopy and gel permeation chromatography were employed to confirm the polymer structures and molecular weights. Transmission electron microscopy and dynamic light scattering were used to observe the self-assembly behavior. The experimental results revealed that the volume content of deionized water in the mixture significantly affects the morphology and size of the aggregates formed by PLL-b-PBLG-g-PEG copolymers. Spherical, spindle-like, needle-like, and daisy-like aggregates were observed with an increase in the volume content of deionized water in the mixture.

A novel polymer electrolyte based on oligo(ethylene glycol) 600, K2PdCl4, and K3Fe(CN)6

1997 ◽  
Vol 12 (12) ◽  
pp. 3393-3403 ◽  
Author(s):  
Vito Di Noto
Keyword(s):  
Ethylene Glycol ◽  
Analytical Data ◽  
Conductivity Measurements ◽  
Poly Ethylene Glycol ◽  
Ir Studies ◽  
Structure Morphology ◽  
Different Temperatures ◽  
Ft Ir ◽  
Poly Ethylene ◽  
Peg 600

New electrolytic systems were prepared by reacting K3Fe(CN)6 and K2PdCl4 in a mixture of water and poly(ethylene glycol) 600 (PEG). The reaction occurs in two steps: first a gel is formed, which then shrinks, releasing the solvent. The product thus obtained has the consistency of a smooth, solid plastic paste and is very stable. The influence of the reaction mixture on the structure, morphology, and conductivity of the products was investigated carrying out three preparations (I, II, III) at increasing ratio PEG 600/H2O. By FT-IR studies and analytical data it was concluded that these materials are inorganic-organic networks containing CN bridges between Fe and Pd atoms and PEG 600 bridges between Pd atoms. Scanning electron microscopy studies revealed that the morphology of polymers I, II, and III is significantly influenced by the conditions of the synthesis. Conductivity measurements made at different temperatures showed that polymers I, II, and III conduct ionically. The conductivity of polymer I, which was synthesized with the highest water/PEG 600 ratio, is on the order of 1.4 · 10−3 Sycm at 25 °C.

Synthesis and Self-Assembly of Well-Defined pH-Responsive Block Glycopolymers

2015 ◽  
Vol 815 ◽  
pp. 359-366 ◽  
Author(s):  
Qing Yun Yu ◽  
Lu Bin Lin ◽  
Xue Yu Xing ◽  
Hai Liang Dong ◽  
Xiao Ze Jiang ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Self Assembly ◽  
Phenylboronic Acid ◽  
Proton Nuclear Magnetic Resonance ◽  
Similar Degree ◽  
Random Structure ◽  
Ph Responsive ◽  
Poly Ethylene Glycol ◽  
Ethyl Methacrylate ◽  
Poly Ethylene

Two pH-responsive block glycopolymers, poly (ethylene glycol)-b-Poly (2- (diethylamino) ethyl methacrylate-co-2-gluconamidoethyl methacrylate) (PEG113-b-P(DEA55-co-GAMA12)) and poly (ethylene glycol)-b-poly (2-(diethylamino) ethyl methacrylate)-b-poly (2-gluconamido ethyl methacrylate) (PEG113-b-PDEA55-b-PGAMA15), were synthesized via atom transfer radical polymerization (ATRP) by directly or successively polymerization of GAMA and DEA monomers using a PEG-based macroinitiator, respectively, without protecting group chemistry. Those block glycopolymers were confirmed by proton Nuclear Magnetic Resonance (1H NMR) and Gel Permeation Chromatography (GPC), and their self-assembly behaviors were characterized by Transmission Electron Microscopy (TEM), Dynamic Light Scattering (DLS) and Zeta-potential. The results show both synthetic block glycopolymers were dissolved molecularly in aqueous solution at acidic pH (such as pH 3), thus it can reversibly convert to be two-layer micelles comprising DEA and GAMA cores, PEG coronas with size of around 50 nm, or micelles comprising DEA cores, GAMA and PEG outer coronas with bigger size of 70 nm for PEG113-b- P(DEA55-co-GAMA12) and PEG113-b-PDEA55-b-PGAMA15), respectively, at basic condition. Both glycopolymers have the micellization process at middle pH (pH 6-8), but possess different isoelectric points (pIs) (at pH 8.0 and 7.8) for their pH responsive block of PEG113-b-P(DEA55-co-GAMA12) and PEG113-b-PDEA55-b-PGAMA15 with DEA-co-GAMA random structure or DEA chain only, respectively. This study not only reveals the self-assembly of pH responsive block glycopolymers with different architectures by fixing similar degree polymerization (DP) of their blocks, but also provides a tool to investigate pH induced dynamic covalent interaction between glycopolymers and phenylboronic acid derivatives or a light for designing novel drug delivery carriers.

scholarly journals Study of liquid-liquid equilibria in aqueous two-phase systems formed by poly (ethylene glycol) (PEG) and sodium thiosulfate pentahydrate (Na2S2O3.5H2O) at different temperatures

2018 ◽  
Vol 476 ◽  
pp. 118-125 ◽  
Author(s):  
Amanda Cristina de Oliveira ◽  
Filipe Hobi Bordon Sosa ◽  
Mariana Conceição da Costa ◽  
Elias de Souza Monteiro Filho ◽  
Roberta Ceriani
Keyword(s):  
Ethylene Glycol ◽  
Sodium Thiosulfate ◽  
Poly Ethylene Glycol ◽  
Two Phase ◽  
Different Temperatures ◽  
Aqueous Two Phase Systems ◽  
Phase Systems ◽  
Poly Ethylene

Effects of denaturing acid on the self-association behaviour of poly(ethylene glycol)-block-poly(γ-benzyl l-glutamate)-graft-poly(ethylene glycol) copolymer in ethanol

2011 ◽  
Vol 65 (4) ◽  
Author(s):  
Guo-Quan Zhu ◽  
Qiao-Chun Gao ◽  
Fa-Gang Wang ◽  
Guo-Chang Li ◽  
Ping Wang
Keyword(s):  
Ethylene Glycol ◽  
Polymeric Micelles ◽  
The Self ◽  
Mixed System ◽  
Resonance Spectroscopy ◽  
Poly Ethylene Glycol ◽  
Transmission Electron ◽  
Self Association ◽  
Ester Exchange Reaction ◽  
Poly Ethylene

AbstractPoly(ethylene glycol)-block-poly(γ-benzyl l-glutamate)-graft-poly(ethylene glycol) (PEG-b-PBLG-g-PEG) copolymer was synthesised by the ester exchange reaction of PEG-block-PBLG copolymer with mPEG. The self-association behaviour of PEG-b-PBLG-g-PEG in mixtures of ethanol, chloroform, and trifluoroacetic acid as denaturing acid was investigated by transmission electron microscopy, nuclear magnetic resonance spectroscopy, FT-IR spectroscopy, dynamic light scattering, and viscometry. It was revealed that the increase in denaturing acid content in the mixed system not only promoted the critical micelle concentration but also changed the morphology of the polymeric micelles from elliptical to spherical.

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