Electrolytic Conductivity and Glass Transition Temperatures as Functions of Salt Content, Solvent Composition, or Temperature for LiBF4in Propylene Carbonate + Diethyl Carbonate

2004 ◽  
Vol 49 (4) ◽  
pp. 1102-1109 ◽  
Author(s):  
Michael S. Ding
Keyword(s):  
Glass Transition ◽  
Propylene Carbonate ◽  
Salt Content ◽  
Solvent Composition ◽  
Electrolytic Conductivity ◽  
Diethyl Carbonate ◽  
Transition Temperatures ◽  
Glass Transition Temperatures

scholarly journals Structure–Property Relationship of Polymerized Ionic Liquids for Solid-State Electrolyte Membranes

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 792
Author(s):  
Robert Löwe ◽  
Thomas Hanemann ◽  
Tatiana Zinkevich ◽  
Andreas Hofmann
Keyword(s):  
Ionic Liquids ◽  
Glass Transition ◽  
Ionic Conductivity ◽  
Salt Content ◽  
Lithium Ion ◽  
Transition Temperatures ◽  
Structure Property ◽  
Glass Transition Temperatures ◽  
Conducting Salt ◽  
Ion Conducting

Eight new polymerized ammonium-based ionic liquids were prepared as thin membrane films and evaluated within the scope of their usage in lithium-ion batteries. The focus of this work is to get a better understanding of the influence of structural modifications of the monomers on the polymerized materials. Further, different concentrations of a lithium-ion conducting salt were applied in order to receive an optimized combination of monomer structure and lithium salt concentration. It was found that an increased side chain length of the studied ammonium-based polymerized ionic liquids leads to a reduction in glass transition temperatures and increased ionic conductivity values. As a result of the addition of conducting salt to the PIL membranes, the glass transition temperatures and the ionic conductivity values decreases. Nevertheless, PFG-NMR reveals a higher lithium-ion mobility for a sample with higher conducting salt content.

Properties of Random PSF/PES Copolymers as High-Performance Polymers

2011 ◽  
Vol 217-218 ◽  
pp. 1606-1610
Author(s):  
Dong Jiang ◽  
Xiao Ran Zhang ◽  
Yan Mei Ma ◽  
Cheng You Ma
Keyword(s):  
Weight Loss ◽  
Tensile Strength ◽  
Glass Transition ◽  
High Performance ◽  
Molar Ratio ◽  
Transition Temperatures ◽  
Elongation At Break ◽  
Glass Transition Temperatures ◽  
High Performance Polymers ◽  
Diphenyl Sulfone

A series of random polysulfone/polyethersulfone (PSF/PES) copolymers were synthesized by the polycondensation of 4, 4'-isopropylidendiphenol, 4, 4΄-dihyolroxy diphenyl sulfone and 4, 4'-dichlorodiphenyl sulfone in the presence of K2CO3. We obtained a series of copolymers by changing the molar ratio of 4, 4΄-dihyolroxy diphenyl sulfone and 4, 4'-isopropylidendiphenol (it was marked as the ratio of S:A). The copolymers have the similar solubility with polyethersulfone. They also have high glass transition temperatures (Tg: 199°C~229°C) and 5% weight loss temperatures (4, 4'-isopropylidendiphenol: 4, 4΄-dihyolroxy diphenyl sulfone=1:1, Td5=497°C). At the same time the elongation at break is much higher than that of PES, while the tensile strength is a little lower than that of PES.

Sign in / Sign up

Export Citation Format

Share Document