Isotope effect in gas transport. I. Measurement of the free volume element in four polymers above the glass transition temperature

1970 ◽  
Vol 8 (11) ◽  
pp. 2015-2027 ◽  
Author(s):  
K. D. Ziegel ◽  
F. R. Eirich
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Isotope Effect ◽  
Free Volume ◽  
Gas Transport ◽  
Volume Element

Synthesis and Gas Transport Properties of New High Glass Transition Temperature Ring-Opened Polynorbornenes

2002 ◽  
Vol 35 (12) ◽  
pp. 4677-4684 ◽  
Author(s):  
Armando Pineda Contreras ◽  
Mikhail A. Tlenkopatchev ◽  
Maria del Mar López-González ◽  
Evaristo Riande
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Transport Properties ◽  
Gas Transport ◽  
High Glass Transition Temperature ◽  
Gas Transport Properties

Temperature Dependence of Free Volume in Epoxy/Rectorite Nanocomposites by Positron Annihilation

2008 ◽  
Vol 607 ◽  
pp. 210-212
Author(s):  
Ming Zhang ◽  
Shao Jie Wang ◽  
L.M. Liu ◽  
Peng Fei Fang
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Low Temperature ◽  
Temperature Dependence ◽  
Viscous Flow ◽  
Polymer Nanocomposites ◽  
Free Volume ◽  
Softening Temperature ◽  
Flow Temperature

Recently polymer nanocomposites[1,2] have been receiving special attention because of its advantages and unique properties in comparison to the traditional polymer composites.The structural transformation of Epoxy (cured by polyamide) and epoxy/Rectorite nanocomposite(with 0.5% rectorite content) is studied by PALS as a function of temperature from 30K to 490K. For Epoxy and Epoxy/Rectorite nanocomposite, the glass transition temperature (Tg) is observed to be 270K and 260K, the second transition temperature (Tγ) is 160K and 120K, the viscous flow temperature (Tf) is the same as 380K. The result shows that properties of the free-volume in nanocomposite have been changed by the rectorite platelets fully separated in material at low temperature. At the same time, we find that the intensity of o-Ps decreases with increase of the temperature at the softening temperature above the Te.

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