Structural Relaxation of Glass-Forming Polymers Based on an Equation for Configurational Entropy. 2. Structural Relaxation in Polymethacrylates

1995 ◽  
Vol 28 (17) ◽  
pp. 5878-5885 ◽  
Author(s):  
J. L. Gomez Ribelles ◽  
M. Monleon Pradas ◽  
A. Vidaurre Garayo ◽  
F. Romero Colomer ◽  
J. Mas Estelles ◽  
...  
Keyword(s):  
Structural Relaxation ◽  
Configurational Entropy ◽  
Glass Forming

Structural relaxation of glass-forming polymers based on an equation for configurational entropy: 3. On the states attained at infinite time in the structural relaxation process. Results on poly(ether imide)

Polymer ◽  
1997 ◽  
Vol 38 (4) ◽  
pp. 963-969 ◽  
Author(s):  
J.L. Gómez Ribelles ◽  
M. Monleón Pradas ◽  
A. Vidaurre Garayo ◽  
F. Romero Colomer ◽  
J. Más Estellés ◽  
...  
Keyword(s):  
Relaxation Process ◽  
Structural Relaxation ◽  
Configurational Entropy ◽  
Infinite Time ◽  
Glass Forming

TEMPERATURE DEPENDENCE OF CONFIGURATIONAL ENTROPY ON STRUCTURAL RELAXATION FUNCTION IN GLASS-FORMING LIQUIDS

2004 ◽  
Vol 18 (17n19) ◽  
pp. 2623-2627
Author(s):  
WANQIANG CAO ◽  
JUNLI HU
Keyword(s):  
Temperature Dependence ◽  
Structural Relaxation ◽  
Relaxation Function ◽  
Configurational Entropy ◽  
Experimental Results ◽  
Linear Term ◽  
Glass Forming ◽  
Relaxation Functions ◽  
Molecule Number ◽  
Non Linear

A direct correlation between the stretched exponent, β(T), of relaxation functions and configurational entropy of the Adam–Gibbs's theory on cooperatively rearranging region (CRR) in glass-forming liquids is investigated. One important result is that β(T) is equal to the relative configurational entropy per molecule. Another significant prediction is that β(T) is inversely proportional to the critical molecule number z*, of a CRR in the transformation. Further, a factor f(T) is proposed to express the temperature dependence of viscosity and configurational entropy. A modified Vogel-Fulcher–Tammann (VFT) equation is obtained by adding a small non-linear term to f(T). The above theoretic investigations coincide precisely with the calorimetric experimental results of 3-bromopentane.

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