Correlation function formalism for the intrinsic viscosity of polymers

1974 ◽  
Vol 61 (11) ◽  
pp. 4535-4539 ◽  
Author(s):  
Hiromi Yamakawa ◽  
Genzo Tanaka ◽  
W. H. Stockmayer
Keyword(s):  
Correlation Function ◽  
Intrinsic Viscosity ◽  
Function Formalism

The Application of the Memory-Function Formalism to Dielectric Relaxation

1980 ◽  
Vol 35 (11) ◽  
pp. 1207-1217
Author(s):  
P. Bordewijk
Keyword(s):  
Correlation Function ◽  
Dielectric Relaxation ◽  
Single Molecule ◽  
Rotational Diffusion ◽  
Memory Function ◽  
Dielectric Relaxation Time ◽  
Function Formalism ◽  
Correlation Theorem ◽  
Dipole Correlation ◽  
Rotational Diffusion Coefficient

Abstract The application of the memory-function formalism to dielectric relaxation is reconsidered. It is shown that the so-called Corresponding Micro-Macro Correlation theorem is not valid and that for a single macroscopic dielectric relaxation time, the single-molecule dipole correlation function may nevertheless be non-exponential. The deviations from the exponential decay for the single-molecule dipole correlation function are due to spatially dependent orientational correlations, and can at least partly be interpreted in terms of dielectric friction. The unsureness about these correlations implies that it is simpler to determine the rotational diffusion coefficient from the collective orientation correlation time as determined from dielectric measurements than from the single-molecule dipole correlation function as obtained from infrared spectroscopy.

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