Elastoviscous Properties of Amorphous Polymers in the Transition Region. I

1952 ◽  
Vol 74 (13) ◽  
pp. 3378-3381 ◽  
Author(s):  
J. Bischoff ◽  
E. Catsiff ◽  
A. V. Tobolsky
Keyword(s):  
Transition Region ◽  
Amorphous Polymers ◽  
Region I

Elastoviscous Properties of Amorphous Polymers in the Transition Region. I.

1952 ◽  
Vol 25 (4) ◽  
pp. 751-758
Author(s):  
J. Bischoff ◽  
E. Catsiff ◽  
A. V. Tobolsky
Keyword(s):  
Experimental Data ◽  
Transition Region ◽  
Master Curve ◽  
Analytical Procedure ◽  
Relaxation Modulus ◽  
Amorphous Polymers ◽  
Great Accuracy ◽  
Characteristic Relaxation Time ◽  
Region I ◽  
Analytical Expressions

Abstract Experimental data on the stress-relaxation modulus Er,T(t) of a GR-S gum vulcanizate at a series of temperatures in the transition region are presented, and a “master curve” of log Q(t/K) vs. log (t/K) is thereby constructed. The characteristic relaxation time, K, for each temperature is defined and tabulated. A distinctive temperature, Td, is observed at which the activation energy for K is a maximum. Analytical expressions are given which describe the GR-S master-curve with great accuracy. The same analytical procedure can be successfully applied to data previously obtained for polymethyl methacrylate. A reduced equation is proposed which describes the time and temperature dependence of Q(t/K) in the transition region for both polymers.

Observation and Modeling of the Solar Transition Region. I. Multi‐Spectral Solar Telescope Array Observations

1999 ◽  
Vol 524 (2) ◽  
pp. 1105-1121 ◽  
Author(s):  
Hakeem M. Oluseyi ◽  
A. B. C. Walker II ◽  
Jason Porter ◽  
Richard B. Hoover ◽  
Troy W. Barbee, Jr.
Keyword(s):  
Transition Region ◽  
Solar Telescope ◽  
Telescope Array ◽  
Solar Transition Region ◽  
Solar Transition ◽  
Region I
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