Revisiting the glass transition temperature of water-glycerol mixtures in bulk and confined in mesoporous silica.

2021 ◽  
Author(s):  
Ivette Angarita ◽  
María Florencia Mazzobre ◽  
Horacio R Corti ◽  
M Paula Longinotti
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Mesoporous Silica ◽  
Mixture Composition ◽  
Confined Water ◽  
Water Glycerol

In this work we revisited the glass transition temperature (Tg) behavior of bulk and confined water-glycerol solutions, as a function of the mixture composition and size of the confinement media,...

Characterising glass transition temperatures and glass dynamics in mesoporous silica-based amorphous drugs

2019 ◽  
Vol 21 (35) ◽  
pp. 19686-19694 ◽  
Author(s):  
Eric Ofosu Kissi ◽  
Michael T. Ruggiero ◽  
Nele-Johanna Hempel ◽  
Zihui Song ◽  
Holger Grohganz ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Mesoporous Silica ◽  
Transition Temperatures ◽  
Glass Transition Temperatures ◽  
Drug Molecules ◽  
Glass Dynamics ◽  
Amorphous Drugs ◽  
Amorphous Drug

Amorphous drug molecules bound to MPS surface are restricted in mobility, but they exhibit a primary glass transition temperature.

A Novel Poly(Ionic Liquid) as the Thermal Insulating Material

2020 ◽  
Vol 13 (3) ◽  
pp. 241-247
Author(s):  
Wenxin Wei ◽  
Guifeng Ma ◽  
Hongtao Wang ◽  
Jun Li
Keyword(s):  
Thermal Conductivity ◽  
Ionic Liquid ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Flame Resistance ◽  
Insulating Material ◽  
Low Thermal Conductivity ◽  
Thermal Insulating ◽  
Poly Ionic Liquid

Objective: A new poly(ionic liquid)(PIL), poly(p-vinylbenzyltriphenylphosphine hexafluorophosphate) (P[VBTPP][PF6]), was synthesized by quaternization, anion exchange reaction, and free radical polymerization. Then a series of the PIL were synthesized at different conditions. Methods: The specific heat capacity, glass-transition temperature and melting temperature of the synthesized PILs were measured by differential scanning calorimeter. The thermal conductivities of the PILs were measured by the laser flash analysis method. Results: Results showed that, under optimized synthesis conditions, P[VBTPP][PF6] as the thermal insulator had a high glass-transition temperature of 210.1°C, high melting point of 421.6°C, and a low thermal conductivity of 0.0920 W m-1 K-1 at 40.0°C (it was 0.105 W m-1 K-1 even at 180.0°C). The foamed sample exhibited much low thermal conductivity λ=0.0340 W m-1 K-1 at room temperature, which was comparable to a commercial polyurethane thermal insulating material although the latter had a much lower density. Conclusion: In addition, mixing the P[VBTPP][PF6] sample into polypropylene could obviously increase the Oxygen Index, revealing its efficient flame resistance. Therefore, P[VBTPP][PF6] is a potential thermal insulating material.

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