Effect of Molecular Weight on the Mechanical and Electrical Properties of Block Copolymer Electrolytes

2007 ◽  
Vol 40 (13) ◽  
pp. 4578-4585 ◽  
Author(s):  
Mohit Singh ◽  
Omolola Odusanya ◽  
Gregg M. Wilmes ◽  
Hany B. Eitouni ◽  
Enrique D. Gomez ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Block Copolymer ◽  
Electrical Properties ◽  
Mechanical And Electrical Properties ◽  
Block Copolymer Electrolytes

scholarly journals Interplay between Mechanical and Electrochemical Properties of Block Copolymer Electrolytes and its Effect on Stability against Lithium Metal Electrodes

2021 ◽  
Author(s):  
Vivaan Patel ◽  
Jacqueline Maslyn ◽  
Saheli Chakraborty ◽  
Gurmukh K Sethi ◽  
Irune Villalengua ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Block Copolymer ◽  
Electrochemical Properties ◽  
Current Density ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Limiting Current ◽  
Conducting Phase ◽  
Limiting Current Density ◽  
Block Copolymer Electrolytes ◽  
Oligomeric Silsesquioxane

Abstract We have studied the cycle life of two polyhedral oligomeric silsesquioxane-b-poly(ethylene oxide)-b-polyhedral oligomeric silsesquioxane (POSS-PEO-POSS) block copolymer electrolytes differing primarily in molecular weights and composition using lithium/polymer/lithium symmetric cells. The higher molecular weight electrolyte, labeled H, has a higher storage modulus, Gel. However, the volume fraction of the conducting phase in the low molecular weight electrolyte, labeled L, is higher and this leads to a four-fold increase in limiting current density, iL. Measurement of ionic conductivity provides insight into the reason for the observed differences in limiting current density. The average lifetime of symmetric cells with electrolyte L was slightly higher than that of cells with electrolyte H. The combined effect of mechanical and electrochemical properties of electrolytes on the stability of lithium electrodeposition was quantified by examining two dimensionless parameters, i/iL and Gel/GLi, introduced in the theory developed by Barai and Srinivasan [Phys. Chem. Chem. Phys., 19, 20493–20505 (2017)]. This theory predicts the regime of stable lithium electrodeposition as a function of these two parameters. Despite large differences in Gel and iL between the two electrolytes, we show that similar cell lifetimes are consistent with the theoretical predictions of unstable lithium electrodeposition without resorting to any adjustable parameters.

Ionic Conductivity of Low Molecular Weight Block Copolymer Electrolytes

2013 ◽  
Vol 46 (3) ◽  
pp. 914-921 ◽  
Author(s):  
Rodger Yuan ◽  
Alexander A. Teran ◽  
Inna Gurevitch ◽  
Scott A. Mullin ◽  
Nisita S. Wanakule ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Block Copolymer ◽  
Ionic Conductivity ◽  
Low Molecular Weight ◽  
Block Copolymer Electrolytes

Impact of Molecular Weight on the Mechanical and Electrical Properties of a High-Mobility Diketopyrrolopyrrole-Based Conjugated Polymer

2020 ◽  
Vol 53 (11) ◽  
pp. 4490-4500
Author(s):  
Dandan Pei ◽  
Zhongli Wang ◽  
Zhongxiang Peng ◽  
Jidong Zhang ◽  
Yunfeng Deng ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Electrical Properties ◽  
Conjugated Polymer ◽  
High Mobility ◽  
Mechanical And Electrical Properties

Effect of Molecular Weight and Salt Concentration on Conductivity of Block Copolymer Electrolytes

2009 ◽  
Vol 42 (13) ◽  
pp. 4632-4637 ◽  
Author(s):  
Ashoutosh Panday ◽  
Scott Mullin ◽  
Enrique D. Gomez ◽  
Nisita Wanakule ◽  
Vincent L. Chen ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Block Copolymer ◽  
Salt Concentration ◽  
Block Copolymer Electrolytes

Polybenzimidazoles/Phosphoric Acid Solid Polymer Electrolytes: Mechanical and Electrical Properties

1998 ◽  
Vol 548 ◽  
Author(s):  
M. Litt ◽  
R. Ameri ◽  
Y. Wang ◽  
R. Savinell ◽  
J. Wainwright
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Electrical Properties ◽  
Phosphoric Acid ◽  
Polymer Electrolytes ◽  
Solid Polymer Electrolytes ◽  
Inherent Viscosity ◽  
Solid Polymer ◽  
Elongation At Break ◽  
Mechanical And Electrical Properties

ABSTRACTPoly (2,2'-(m-phenylene) 5,5'-bibenzimidazole), PBI and poly (2,5-benzimidazole), ABPBI, were cast into films and doped with phosphoric acid. Their mechanical properties were studied as a function of inherent viscosity and phosphoric acid content. The commercial PBI with an I. V. of 0.8 to 0.9 had relatively low elongation at break. It was fractionated; the higher the inherent viscosity the higher the modulus and elongation. At low phosphoric acid doping the modulus rose because a crystalline phase developed, and then dropped as more phosphoric acid was added. A second doping method produced films with high crystallinity and higher conductivity (0.02-.03 vs. 0.06-.08 S/cm) but poorer elongation than those made by doping a cast film in phosphoric acid. In order to get higher molecular weight films that could have better mechanical properties, we decided to polymerize 3,4-diaminobenzoic acid to ABPBI, an AB polymer for which I. V.'s of∼16 have been reported. After learning how to purify and polymerize the monomer, I. V.'s of 6–8 were easily obtained. Conductivities of the doped ABPBI films were as high as those of the best PBI films. With their high viscosities, the ABPBI films were much tougher and had better elongation than the doped PBI films.

scholarly journals MoO3 Nanobelts Embedded Polypyrrole/SIS Copolymer Blends for Improved Electro-Mechanical Dual Applications

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 353 ◽  
Author(s):  
Arslan Umer ◽  
Faroha Liaqat ◽  
Azhar Mahmood
Keyword(s):  
Thin Film ◽  
Tensile Strength ◽  
Block Copolymer ◽  
Electrical Properties ◽  
Polymeric Nanocomposites ◽  
Copolymer Blends ◽  
Mechanical And Electrical Properties ◽  
Eds Analysis ◽  
Good Potential ◽  
Research Endeavor

This research endeavor aimed to develop thin film blends of polypyrrole (PPy) and poly (styrene-isoprene-styrene) (SIS) with MoO3 as a nanofiller for improved mechanical and electrical properties to widen its scope in the field of mechatronics. This study reports blends of polypyrrole (PPy) and poly (styrene-isoprene-styrene) (SIS) tri-block copolymer showing improved mechanical and electrical attributes while employing MoO3 nanobelts as nanofillers that additionally improves the abovementioned properties in the ensuing nanocomposites. The synthesis of PPy/SIS blends and MoO3/PPy/SIS nanocomposites was well corroborated with XRD, SEM, FTIR, and EDS analysis. Successful blending of PPy was yielded up to 15 w/w% PPy in SIS, as beyond this self-agglomeration of PPy was observed. The results showed a remarkable increase in the conductivity of insulating SIS copolymer from 1.5 × 10−6.1 to 0.343 Scm−1 and tensile strength up to 8.5 MPa with the 15 w/w% PPy/SIS blend. A further enhancement of the properties was recorded by embedding MoO3 nanobelts with varying concentrations of the nanofillers into 15 w/w% PPy/SIS blends. The mechanical strength of the polymeric nanocomposites was enhanced up to 11.4 MPa with an increase in conductivity up to 1.51 Scm−1 for 3 w/w% MoO3/PPy-SIS blends. The resultant product exhibited good potential for electro-mechanical dual applications.

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