scholarly journals Preparation, Properties and Cell Biocompatibility of Room Temperature LCST-Hydrogels Based on Thermoresponsive PEO Stars

Gels ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 84
Author(s):  
Bagus Santoso ◽  
Paul Turner ◽  
Lyall Hanton ◽  
Stephen C. Moratti
Keyword(s):  
Shear Modulus ◽  
Room Temperature ◽  
Good Control ◽  
Linear Polymers ◽  
High Concentration ◽  
Gelling Temperature ◽  
Poly Ethylene Oxide ◽  
Cell Biocompatibility ◽  
Poly Ethylene ◽  
Lower Temperature

A series of star and linear polymers based on a poly(ethylene oxide) core and poly(diethylene glycol ethyl ether acrylate) outer arms were synthesised by atom-transfer radical polymerization. The polydispersity of the polymers were low, showing good control of initiation and growth. They all showed lower critical solution (LCST) behaviour, and at 30% concentration most gelled at or below room temperature. The behaviour depended on the number and length of the arms, with the polymers with longer arms gelling at a lower temperature and producing stiffer gels. The shear modulus of the gels varied between 1 and 48 kPa, with the gelling temperature varying between 16 and 23 °C. Attempted cell cultures with the polymers proved unsuccessful, which was determined to be due to the high concentration of polymers needed for gelling.

Effect of High Salt Concentration on Ion Clustering and Transport in Polymer Solid Electrolytes: a Molecular Dynamics Study of PEO-LiTFSI

2018 ◽  
Author(s):  
Nicola Molinari ◽  
Jonathan P. Mailoa ◽  
Boris Kozinsky
Keyword(s):  
Polymer Electrolyte ◽  
Salt Concentration ◽  
Rational Design ◽  
Material System ◽  
Ion Dynamics ◽  
High Concentration ◽  
Anion Clusters ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

<div> <div> <div> <p>The model and analysis methods developed in this work are generally applicable to any polymer electrolyte/cation-anion combination, but we focus on the currently most prominent polymer electrolyte material system: poly(ethylene) oxide/Li- bis(trifluoromethane) sulfonamide (PEO + LiTFSI). The obtained results are surprising and challenge the conventional understanding of ionic transport in polymer electrolytes: the investigation of a technologically relevant salt concentration range (1 - 4 M) revealed the central role of the anion in coordinating and hindering Li ion movement. Our results provide insights into correlated ion dynamics, at the same time enabling rational design of better PEO-based electrolytes. In particular, we report the following novel observations. 1. Strong binding of the Li cation with the polymer competes with significant correlation of the cation with the salt anion. 2. The appearance of cation-anion clusters, especially at high concentration. 3. The asymmetry in the composition (and therefore charge) of such clusters; specifically, we find the tendency for clusters to have a higher number of anions than cations.</p> </div> </div> </div>

Effect of High Salt Concentration on Ion Clustering and Transport in Polymer Solid Electrolytes: a Molecular Dynamics Study of PEO-LiTFSI

2018 ◽  
Author(s):  
Nicola Molinari ◽  
Jonathan P. Mailoa ◽  
Boris Kozinsky
Keyword(s):  
Polymer Electrolyte ◽  
Salt Concentration ◽  
Rational Design ◽  
Material System ◽  
Ion Dynamics ◽  
High Concentration ◽  
Anion Clusters ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

<div> <div> <div> <p>The model and analysis methods developed in this work are generally applicable to any polymer electrolyte/cation-anion combination, but we focus on the currently most prominent polymer electrolyte material system: poly(ethylene) oxide/Li- bis(trifluoromethane) sulfonamide (PEO + LiTFSI). The obtained results are surprising and challenge the conventional understanding of ionic transport in polymer electrolytes: the investigation of a technologically relevant salt concentration range (1 - 4 M) revealed the central role of the anion in coordinating and hindering Li ion movement. Our results provide insights into correlated ion dynamics, at the same time enabling rational design of better PEO-based electrolytes. In particular, we report the following novel observations. 1. Strong binding of the Li cation with the polymer competes with significant correlation of the cation with the salt anion. 2. The appearance of cation-anion clusters, especially at high concentration. 3. The asymmetry in the composition (and therefore charge) of such clusters; specifically, we find the tendency for clusters to have a higher number of anions than cations.</p> </div> </div> </div>

Creation of Stable Poly(ethylene oxide) Surfaces on Poly(methyl methacrylate) Using Blends of Branched and Linear Polymers

1997 ◽  
Vol 30 (22) ◽  
pp. 6947-6956 ◽  
Author(s):  
D. G. Walton ◽  
P. P. Soo ◽  
A. M. Mayes ◽  
S. J. Sofia Allgor ◽  
J. T. Fujii ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Methyl Methacrylate ◽  
Oxide Surfaces ◽  
Linear Polymers ◽  
Poly Methyl Methacrylate ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Li ion Conduction in Cross-Linked Peo-LiCF3SO3 Complex

1988 ◽  
Vol 135 ◽  
Author(s):  
Jun Tsuchiya
Keyword(s):  
Diffusion Coefficient ◽  
Room Temperature ◽  
Transport Number ◽  
Diffusion Measurement ◽  
Poly Ethylene Oxide ◽  
Li Ion ◽  
Poly Ethylene ◽  
Pfg Nmr ◽  
And Diffusion ◽  
Ion Transport Number

AbstractIonic migration of cross-linked amorphous Poly (Ethylene Oxide)-LiCF3SO3was investigated by measuring ionic conductivity and diffusion coefficient. Pulsed-Field-Gradient NMR (PFG-NMR) was used for the diffusion measurement. The measurements were carried out at a temperature region between room temperature and 120°C. The PFG-NMR mea-surement shows the two modes of migration of both cation(Li) and anion (CF3 SO3-) for specimens containing plasticizer (CH30(CHeiH20)gH3C). The two modes of migration for anion are present for specimens without the plasticizer. Li+ transport number is found to be less than 0.1 for specimens without the plasticizer. Plasticizer is found to increase the Li+ ion transport number.

scholarly journals Solubilization Behavior of Homopolymer in Its Blend with the Block Copolymer Displaying the Feature of Lower Critical Ordering Transition

Polymers ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 3415
Author(s):  
Yu-Hsuan Lin ◽  
Chang-Cheng Shiu ◽  
Tien-Lin Chen ◽  
Hsin-Lung Chen ◽  
Jing-Cherng Tsai
Keyword(s):  
Block Copolymer ◽  
Weight Ratio ◽  
Interfacial Free Energy ◽  
Junction Point ◽  
Point Separation ◽  
Vinyl Pyridine ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Lower Temperature ◽  
Ordering Transition

Blending with homopolymer offers a facile approach for tuning the microdomain morphology of block copolymer, provided that the homopolymer chains are uniformly solubilized in the corresponding microdomain to swell the junction point separation. Here we studied the solubilization behavior of poly(4-vinyl pyridine) homopolymer (h-P4VP) in the lamellar microdomain formed by its blends with a poly(ethylene oxide)-block-poly(4-vinyl pyridine) (PEO-b-P4VP) showing the feature of lower critical ordering transition (LCOT) in terms of weaker segregation strength at lower temperature. We revealed that, while the conventional criterion of homopolymer-to-block molecular weight ratio for attaining uniform solubilization was applicable to LCOT blend, there was an excess swelling of junction point separation upon the addition of homopolymer, leading to a decrease of interdomain distance with increasing homopolymer composition. This anomalous phenomenon was attributed to the reduction of interfacial free energy due to the incorporation of P4VP homopolymer into the microdomain interface.

Ionic conductivity of electrolytes based on star-branched poly(ethylene oxide) with high concentration of lithium salts

2011 ◽  
Vol 192 (1) ◽  
pp. 137-142 ◽  
Author(s):  
M. Marzantowicz ◽  
J.R. Dygas ◽  
F. Krok ◽  
Z. Florjańczyk ◽  
E. Zygadło-Monikowska ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Ethylene Oxide ◽  
Lithium Salts ◽  
High Concentration ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene
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