Molecular Weight Dependence of Relaxation Spectra of Amorphous Polymers in the Rubbery Region. VI. Relationship between Relaxation Spectrum and Molecular Weight Distribution Estimated from the Empirical Blending Law for Two-Component Systems

1967 ◽  
Vol 40 (2) ◽  
pp. 493-505 ◽  
Author(s):  
K. Ninomiya ◽  
G. Yasuda
Keyword(s):  
Molecular Weight ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Relaxation Spectrum ◽  
Amorphous Polymers ◽  
Relaxation Spectra ◽  
Molecular Weight Dependence ◽  
Component Systems ◽  
Two Component ◽  
Two Component Systems

Molecular Weight Dependence of Relaxation Spectra of Amorphous Polymers in the Rubbery Region. VII. Comparisons of Experimental Relaxation Spectra with Those Estimated from Molecular Weight Distributions

1967 ◽  
Vol 40 (5) ◽  
pp. 1470-1482 ◽  
Author(s):  
G. Yasuda ◽  
E. Maekawa ◽  
T. Homma ◽  
K. Ninomiya
Keyword(s):  
Experimental Data ◽  
Molecular Weight ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Relaxation Spectrum ◽  
Phenomenological Theory ◽  
Homogeneous Distribution ◽  
Relaxation Spectra ◽  
Molecular Weight Dependence ◽  
Two Samples

Abstract In a previous paper, the relationship between the relaxation spectrum of an amorphous high polymer in the rubbery region and the molecular weight distribution function was studied by the phenomenological theory method. We found a simple, direct proportional relationship between them. The reliability of assumptions and approximations made for the theoretical study can be evaluated by comparison of calculated and experimental data. As reported previously, selection of values for the simplified method was optional in calculating molecular weight dependence of the relaxation spectrum of a sample with a homogeneous distribution. Therefore, the feasibility of selection has to be evaluated by comparison of calculated results with observed data. For the comparison, it is necessary to obtain experimental data for a sample having a homogeneous distribution and compare it with calculated results for the relaxation spectrum and molecular weight distribution of the previous paper. However, these data are scarce in the current literature. From available past literature, we selected polystyrene, poly(vinyl acetate) and polyisobutene as typical samples of amorphous high polymers. In addition, experimental data for two samples of polystyrene were included. Thus, data for a total of five samples were compared with calculated results of the previous paper.

Molecular Weight Dependence of Relaxation Spectra of Amorphous Polymers in the Rubbery Region. VIII. Comparisons of Experimental Relaxation Spectra of Commercial Synthetic Rubbers with those Estimated from Molecular Weight Distributions

1967 ◽  
Vol 40 (2) ◽  
pp. 484-492 ◽  
Author(s):  
Genichi Yasuda
Keyword(s):  
Molecular Weight ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Mechanical Relaxation ◽  
General Validity ◽  
Relaxation Spectra ◽  
Molecular Weight Distributions ◽  
Synthetic Rubber ◽  
Weight Distributions

Abstract Synthetic rubber of different species, types, and degrees of mastication were used to examine the general validity of the proposed relationship between mechanical relaxation spectra in the rubbery region and molecular weight distribution. Results show that the proposed relationship can be well used to discuss quantitatively the role of molecular weight distribution in the theoretical behavior of a raw rubber while being processed.

scholarly journals MOLECULAR WEIGHT DEPENDENCE OF RELAXATION SPECTRA OF AMORPHOUS POLYMERS IN THE RUBBERY REGION.

1966 ◽  
Vol 39 (3) ◽  
pp. 177-184 ◽  
Author(s):  
G. Yasuda ◽  
E. Maekawa ◽  
T. Homma ◽  
K. Ninomiya
Keyword(s):  
Molecular Weight ◽  
Amorphous Polymers ◽  
Relaxation Spectra ◽  
Molecular Weight Dependence
Sign in / Sign up

Export Citation Format

Share Document