Ionically Conducting Glasses with Subambient Glass Transition Temperatures

1997 ◽  
Vol 496 ◽  
Author(s):  
R. E. Dillon ◽  
D. F. Shriver
Keyword(s):  
Glass Transition ◽  
Ionic Conductivity ◽  
Amorphous Phase ◽  
Crown Ethers ◽  
Viscoelastic Properties ◽  
Lithium Salt ◽  
Cavity Size ◽  
Glass Transition Temperatures ◽  
Order Of Magnitude ◽  
New Type

ABSTRACTCryptands and crown ethers along with the lithium salt, LiCF3SO2N(CH2)3OCH3 (LiMPSA) were employed to produce a new type of amorphous electrolyte. The key to producing an amorphous phase was the mismatch between the cavity size of the macrocycle and the diameter of the cation. The addition of poly(bis-(2(2-methoxyethoxy)ethoxy)phosphazene) (MEEP) to the amorphous complex, LiMPSA/2.2.2 Cryptand, imparts improved electrochemical and viscoelastic properties. Conversely, when poly(sodium-4-styrenesulfonate) (PS4SS) is added to the amorphous complex, LiMPSA/2.2.2 Cryptand, the product crystallizes. The ionic conductivity of the MEEP rubbery electrolyte is a full order of magnitude higher when compared to the analogous PS4SS doped electrolyte (3.8×10−5 S cm−1 (MEEP), 1.7×10−6 S cm1 (PS4SS) both at 30°K).

Dynamic Mechanical Losses in Filled Poly(Dimethylsiloxane) Networks

1995 ◽  
Vol 68 (4) ◽  
pp. 601-608 ◽  
Author(s):  
M. A. Sharaf ◽  
A. Kloczkowski ◽  
J. E. Mark
Keyword(s):  
Mechanical Properties ◽  
Glass Transition ◽  
Viscoelastic Properties ◽  
Network Formation ◽  
Dynamic Testing ◽  
Glass Transition Temperatures ◽  
Dynamic Mechanical ◽  
Novel Method ◽  
Particulate Silica

Abstract This investigation focused on the study of dynamic mechanical losses in silica-filled networks of poly(dimethylsiloxane) (PDMS). Some of the samples were filled using a novel method, specifically the in situ precipitation of particulate silica either after or during network formation. Others were filled using the customary method of mechanically blending already-prepared silica into the elastomer prior to its crosslinking, and some were prepared without any filler at all. The resulting materials exhibited a variety of relaxation behaviors over the temperature range 120–260 K. The glass transition temperatures Tg showed only a slight dependence on the presence of the filler particles and crosslinks, but the filler was found to reduce both the degree and rate of crystallization for the in situ filled networks. The results obtained document how the techniques employed for incorporating particulate fillers change the viscoelastic properties of an elastomeric network, and how dynamic testing can yield a great deal of insight and useful information on the mechanical properties of polymers in general.

Calorimetric measurements of structural relaxation and glass transition temperatures in sputtered films of amorphous Te alloys used for phase change recording

2007 ◽  
Vol 22 (3) ◽  
pp. 748-754 ◽  
Author(s):  
J.A. Kalb ◽  
M. Wuttig ◽  
F. Spaepen
Keyword(s):  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Amorphous Phase ◽  
Structural Relaxation ◽  
Continuous Heating ◽  
Scanning Calorimetry ◽  
Glass Transition Temperatures ◽  
Sputtered Films ◽  
Calorimetric Measurements ◽  
History Of

Sputtered amorphous Ge4Sb1Te5, Ge1Sb2Te4, Ge2Sb2Te5, and Ag0.055In0.065Sb0.59Te0.29 thin films were studied by differential scanning calorimetry. Upon continuous heating, heat release due to structural relaxation of the amorphous phase between 0.5 and 1.0 kJ/mol was observed. This value depends on the thermal history of the sample. Preannealing of the amorphous phase revealed the glass transition temperature Tg within 10 K of the crystallization temperature upon continuous heating at 40 K/min.

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.

scholarly journals Complexation of poly(ethylene glycol) with poly(ethyl methacrylate-co-N-vinyl-2-pyrrolidone) gel based on hydrogen bonds

2013 ◽  
Vol 15 (3) ◽  
pp. 85-90 ◽  
Author(s):  
Guoqin Liu
Keyword(s):  
Molecular Weight ◽  
Glass Transition ◽  
Complex Formation ◽  
Hydrogen Bonds ◽  
Ethylene Glycol ◽  
Amorphous Phase ◽  
Poly Ethylene Glycol ◽  
Glass Transition Temperatures ◽  
Ethyl Methacrylate ◽  
Poly Ethylene

Abstract The complexes of poly(ethyl methacrylate-co-N-vinyl-2-pyrrolidone) (P(EMA-co-VP)) gel with poly- (ethylene glycol) (PEG) stabilized by the hydrogen bonds were prepared. It was found that both the concentration and the molecular weight of PEG have a strong effect on the P(EMA-co-VP) gel. When PEG was introduced into the P(EMA-co-VP) gel, the glass transition temperatures (Tg) of the complexes decreases with the decreasing of PEG molecular weight. In such a system, the maximum molecular weight of PEG required for the complex formation is no more than 2000, and P(EMA-co-VP)/PEG complexes are a homogeneous amorphous phase, which was studied by FTIR, XRD, TEM, and DSC.

scholarly journals Amorphous phase state diagrams and viscosity of ternary aqueous organic/organic and inorganic/organic mixtures

2018 ◽  
Vol 20 (22) ◽  
pp. 15086-15097 ◽  
Author(s):  
Aleksandra Marsh ◽  
Sarah Suda Petters ◽  
Nicholas Ernest Rothfuss ◽  
Grazia Rovelli ◽  
Young Chul Song ◽  
...  
Keyword(s):  
Glass Transition ◽  
Amorphous Phase ◽  
Phase State ◽  
Phase Behaviour ◽  
Transition Temperatures ◽  
Glass Transition Temperatures ◽  
Organic Mixtures ◽  
State Diagrams

A Dimer Coagulation, Isolation and Coalescence (DCIC) technique is used to probe the phase behaviour and glass transition temperatures of ternary aerosol mixtures.

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