scholarly journals Characterization of Thermoplastic Elastomers by Means of Temperature Scanning Stress Relaxation Measurements

10.5772/35976 ◽  
2012 ◽  
Author(s):  
Vennemann Norbert
Keyword(s):  
Stress Relaxation ◽  
Thermoplastic Elastomers ◽  
Relaxation Measurements ◽  
Temperature Scanning

Investigation of modified SEBS-based thermoplastic elastomers by temperature scanning stress relaxation measurements

2005 ◽  
Vol 45 (11) ◽  
pp. 1498-1507 ◽  
Author(s):  
Aron Barbe ◽  
Klaus Bökamp ◽  
Claudia Kummerlöwe ◽  
Henner Sollmann ◽  
Norbert Vennemann ◽  
...  
Keyword(s):  
Stress Relaxation ◽  
Thermoplastic Elastomers ◽  
Relaxation Measurements ◽  
Temperature Scanning

Investigation of Un-Vulcanized Natural Rubber by Means of Temperature Scanning Stress Relaxation Measurements

2013 ◽  
Vol 718-720 ◽  
pp. 117-123 ◽  
Author(s):  
Miao Wu ◽  
Michael Heinz ◽  
Norbert Vennemann
Keyword(s):  
Mechanical Properties ◽  
Stress Relaxation ◽  
Natural Rubber ◽  
Branch Points ◽  
Relaxation Spectra ◽  
Green Strength ◽  
Testing Method ◽  
Relaxation Measurements ◽  
Different Types ◽  
Temperature Scanning

Two different types of un-vulcanized natural rubber, air dried sheets (ADS) and SVR-3L block rubber, were investigated by a new testing method and the results are compared with other mechanical properties. It was found that green strength is strongly reduced if the sample is ther­mal­ly treated before testing. Presumably, the decrease of strength is caused by a decrease of branch points, mainly composed of phospholipids, which are linked to the a - terminal groups of the rubber molecules. The existence of two different types of branch points is indicated by relaxation spectra, obtained from temperature scanning stress relaxation (TSSR) measurements.

The Development of Elastomer Rheological Processability Quality Control Instruments

1993 ◽  
Vol 66 (3) ◽  
pp. 435-454 ◽  
Author(s):  
James L. White ◽  
Istvan Soos
Keyword(s):  
World War Ii ◽  
Stress Relaxation ◽  
The United States ◽  
World War ◽  
Past Generation ◽  
American Interest ◽  
Relaxation Measurements ◽  
Increased Activity ◽  
Pressure Controlled

Abstract We have surveyed the development of processability measurements from its origins, about 1920, to the present. We have followed the factors—technology, scientific, and political—which have caused its evolutions. The earliest instruments the capillary and compression rheometer, are still with us. As early as the mid 1930s, different traditions developed in the United States and Germany, differences which continue to the present day. These were accentuated by the development of synthetic rubber and World War II. The Germany industry used the Defo compression instrument and the Americans decided on the Mooney shearing disc viscometer. The early postwar period saw a temporary withdrawal of German activity and an American interest in stress relaxation measurements with a biconical stress relaxation instrument being made semi-commercial by B. F. Goodrich in the 1970s. B. F. Goodrich has continued to improve this instrument over the past generation. The post-1975 period has also seen increased activity in Germany; Bayer AG(i) redesigned the Defo instrument and had it commercialized by Haake and (ii) devised a Mooney post-shearing stress relaxation measurement which has been commercially developed by Monsanto. A pressure-controlled rotational rheometer has been developed by Avon Rubber which allows for better study and characterization of slip. The development of instruments has been coupled with growing knowledge of the rheological properties of gum elastomers and carbon black compounds.

Characterization of Polymers under Large Deformation. I. Repeated Chemical Stress Relaxation of Vulcanized Rubbers

1973 ◽  
Vol 46 (2) ◽  
pp. 388-397
Author(s):  
Takae Kusano ◽  
Kenkichi Murakami
Keyword(s):  
Stress Relaxation ◽  
Large Deformation ◽  
Mechanical Stimulus ◽  
Relaxation Behavior ◽  
Chemical Stress ◽  
Measurement Temperature ◽  
Extension Ratio ◽  
Relaxation Measurements ◽  
Relaxation Curves

Abstract In this investigation, repeated chemical stress relaxation measurements were carried out to observe the relaxation behavior at large deformation. It was found that the repeated chemical stress relaxation curves were affected by both measurement temperature and the extension ratio of rubber. It was suggested on the basis of the results that temperature and mechanical stimulus have a similar effect on the stress relaxation curves.

Sign in / Sign up

Export Citation Format

Share Document