Study of the movements of cycloalkyl side groups in polymethacrylates by dynamic mechanical measurements

1967 ◽  
Vol 16 (6) ◽  
pp. 3413-3422 ◽  
Author(s):  
J. Heijboer
Keyword(s):  
Dynamic Mechanical ◽  
Mechanical Measurements

scholarly journals Telechelic ionomers studied by light scattering and dynamic mechanical measurements

1996 ◽  
Vol 112 (2-3) ◽  
pp. 155-162 ◽  
Author(s):  
Christophe Chassenieux ◽  
Ragnar Johannsson ◽  
Dominique Durand ◽  
Taco Nicolai ◽  
Pierre Vanhoorne ◽  
...  
Keyword(s):  
Light Scattering ◽  
Dynamic Mechanical ◽  
Mechanical Measurements ◽  
Telechelic Ionomers

Changes in the Dynamic Modulus during Thermal Degradation of Polyisoprene Vulcanizates

1980 ◽  
Vol 53 (4) ◽  
pp. 944-949 ◽  
Author(s):  
Shoichiro Yano
Keyword(s):  
Thermal Degradation ◽  
Dynamic Modulus ◽  
Dynamic Method ◽  
Activation Energies ◽  
Time Axis ◽  
Frequency Dependent ◽  
Dynamic Mechanical ◽  
Mechanical Measurements

Abstract Thermal degradation of IR is investigated in air and in N2 by dynamic mechanical measurements. In this dynamic method, the change in the relative dynamic modulus is found to be frequency dependent, but the data at various frequencies can be superimposed upon each other by shifting along the time axis. Changes in relative modulus as a function of time in air and in N2 can be expressed by Equation (1), which contains two exponential terms. The activation energies for k1 and k2 are 84 and 57 kj/mol in air, and 61 and 57 kJ/mol in N2, respectively.

Evaluation of certain parameters of the boundary layer in the fiber-polymer matrix system by means of dynamic mechanical measurements

1986 ◽  
Vol 22 (3) ◽  
pp. 280-283 ◽  
Author(s):  
Yu. S. Lipatov ◽  
�. Ya. Gorichko ◽  
L. M. Sergeeva ◽  
A. A. Brovko ◽  
V. F. Rosovitskii
Keyword(s):  
Boundary Layer ◽  
Polymer Matrix ◽  
Matrix System ◽  
Dynamic Mechanical ◽  
Mechanical Measurements

Dynamic mechanical measurements with the eccentric rotating disks flow

1974 ◽  
Vol 13 (4-5) ◽  
pp. 814-829 ◽  
Author(s):  
C. W. Macosko ◽  
W. M. Davis
Keyword(s):  
Rotating Disks ◽  
Dynamic Mechanical ◽  
Mechanical Measurements

scholarly journals Rheological properties of concentrated solutions of carboxymethyl starch

2003 ◽  
Vol 57 (11) ◽  
pp. 547-552 ◽  
Author(s):  
Zeljko Stojanovic ◽  
Katarina Jeremic ◽  
Slobodan Jovanovic
Keyword(s):  
Reaction Medium ◽  
Dynamic Mechanical Properties ◽  
Concentrated Solutions ◽  
Influence Of Temperature ◽  
Carboxymethyl Starch ◽  
Dynamic Mechanical ◽  
Mechanical Measurements ◽  
Three Samples ◽  
Influence Of Temperature On ◽  
Physical Crosslinking

Carboxymethyl starch was synthesized by the esterification of starch with monochloroacetic acid in ethanol as a reaction medium. Three samples of carboxymethyl starch having different degrees of substitution were prepared. The influence of temperature on the viscosity of concentrated carboxymethyl starch solutions, as well as the dynamic-mechanical properties of the concentrated solutions were investigated. The activation energy of viscous flow was determined and it was found that it decreased with increasing degree of substitution. The results of the dynamic-mechanical measurements showed that solutions of starch and carboxymethyl starches with higher degrees of substitution behave as gels. Values of the storage modulus in the rubbery plateau were used to calculate the molar masses between two points of physical crosslinking, the density of crosslinking and the distance between two points of crosslinking.

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