A comparative study of the effect of some paraffinic oils on rheological and dynamic properties and behavior at low temperature in EPDM rubber compounds

2005 ◽  
Vol 97 (5) ◽  
pp. 1825-1834 ◽  
Author(s):  
L. Ibarra ◽  
P. Posadas ◽  
M. Esteban-Martínez
Keyword(s):  
Low Temperature ◽  
Comparative Study ◽  
Dynamic Properties ◽  
Epdm Rubber ◽  
Rubber Compounds ◽  
And Behavior

Applications of Thermal Analytical Procedures in the Study of Elastomers and Elastomer Systems

1980 ◽  
Vol 53 (3) ◽  
pp. 437-511 ◽  
Author(s):  
D. W. Brazier
Keyword(s):  
Thermal Analysis ◽  
Dynamic Properties ◽  
Evolved Gas Analysis ◽  
Gas Analysis ◽  
International Standards ◽  
New Technique ◽  
Heating Rates ◽  
Single Experiment ◽  
Rubber Compounds

Abstract An attempt has been made to review the development of thermoanalytical procedures as they have been applied to elastomers and elastomer systems over the past 10 years. For all rubber industry products, temperature and its effects, either alone or in conjunction with the chemical environment, play an important role from the production stage through to the final failure of the product in the field. It is thus not surprising that thermal analysis, in which temperature is the prime variable, has found such diverse applications in elastomer studies. The identification and quantitative analysis of rubber formulations have received most attention. Such formulations produce characteristic “fingerprints” when studied in DTA, DSC, TG, or TMA. In DSC, the determination of the glass transition characteristics, the observation and determination of crystallinity, the detection of cyclization reactions, and the monitoring of thermal and oxidative degradation characteristics can all be observed in a single experiment covering the temperature range from −150 to +600°C. At normal heating rates, e.g., 20°C/min, such information is available in 40 min. TG/DTG analysis can yield the elastomer or elastomers content, oil and plasticizer, carbon black (level and often type), and inorganic ash in less than 60 min. Processing and curing can also be studied. Blend compatibility can be assessed on the basis of both Tg and crystallinity measurements and the data used to determine optimum mixing times. Sulfur vulcanization and peroxide curing of elastomers is readily monitored by DSC and can be used for confirmation analysis of the presence of curatives. Limitations in such analysis exist, but as understanding and ability to interpret cure exotherms increase, valuable information about the mechanism and the nature of the cured network will be obtained. The testing of rubber compounds involves many hours of labor by current procedures. The rapidity of thermal analysis promises to offer some relief. In addition to DSC and TG, TMA, a relatively new technique, offers a rapid approach to low-temperature testing. Dynamic mechanical analysis (DMA) offers a rapid route to determining dynamic properties, but as yet, relatively little has been published on the application of this new technique to elastomers. As environmental concern increases, techniques such as evolved gas analysis (EGA) and combined techniques such as TG/gas chromatography are predicted to play an important role. As for the future, it is readily apparent that the principles of the methods have been established and, in several cases, it now remains to reduce them to a practical level. In some areas, such as vulcanization studies, much remains to be undertaken to improve our interpretive skills. Although there is some indication that certain industries have produced “in-house” standards for the analysis of rubber compounds by DSC and TG/DTG, it will only be when national and international standards organizations study and produce standard procedures, that the techniques will be generally adopted. Maurer's prediction in 1969 of increased applications of DTA and TG in elastomer studies has undoubtedly proved correct, and with the proliferation of reliable commercial instrumentation, significant developments can be anticipated in the next decade.

Vulcanization of EPDM rubber compounds with and without blowing agents: Identification of reaction events and TTT-diagram using DSC data

2014 ◽  
Vol 55 (9) ◽  
pp. 2073-2088 ◽  
Author(s):  
Nora Catalina Restrepo-Zapata ◽  
Tim A. Osswald ◽  
Juan Pablo Hernández-Ortiz
Keyword(s):  
Ttt Diagram ◽  
Epdm Rubber ◽  
Blowing Agents ◽  
Rubber Compounds

Conditions for the development of the philosophy of non-violence in the modern world

2020 ◽  
pp. 337-352
Author(s):  
Tolganay V. Mustafina-Kulchmanova ◽  
Zhabayhan M. Abdildin ◽  
Kudaibergen A. Temirgaliev ◽  
Kuralay S. Yermagambetova ◽  
Manifa S. Sarkulova
Keyword(s):  
Public Opinion ◽  
Comparative Study ◽  
Political Science ◽  
Practical Significance ◽  
Modern World ◽  
Practical Application ◽  
Theoretical Methods ◽  
University Teachers ◽  
Analysis And Synthesis ◽  
And Behavior

This article addresses the issues of the genesis of non-violence and the practical application of non-violent practices in the context of modern realities. The phe-nomenon of non-violence is seen in close connection with violence, which is more often reflected in the form of wars, military clashes, and conflicts. The article pro-vides an analysis of the use of non-violent practices and the possibility of develop-ing peacekeeping in public opinion and behavior. During the preparation of this article, a review and comparative study of various literature aimed at studying non-violence were carried out. Together with the philosophical works, various ma-terials of a political science character are studied. In preparing this work, they were used as general theoretical methods, such as analysis and synthesis. At the same time, analogies, systematization, etc. were used. The materials of the article sug-gest practical significance for university teachers of humanitarian/philosophical specialties.

THERMOPHYSICAL AND DYNAMIC PROPERTIES OF BUTADIENE-NITRILE RUBBER FILLED WITH ULTRA HIGH-MOLECULAR WEIGHT POLYETHYLENE

2021 ◽  
Vol 0 (2) ◽  
pp. 36-43
Author(s):  
N.V. Shadrinov ◽  
◽  
A.A. Khristoforova ◽  
Keyword(s):  
Molecular Weight ◽  
Dynamic Properties ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Physicomechanical Properties ◽  
Butadiene Rubber ◽  
Rubber Compounds ◽  
Ultrahigh Molecular Weight ◽  
Before And After ◽  
Butadiene Nitrile Rubber ◽  
Ultra High Molecular Weight

The results of the study of the complex of properties of an elastomeric composite material based on nitrile butadiene rubber BNKS-18 and ultrahigh molecular weight polyethylene are presented. The effect of UHMWPE on the vulcanization characteristics of rubber compounds, the physicomechanical properties of vulcanizates before and after thermal aging in a hydrocarbon environment and air, and also on the dynamic properties before and after curing are investigated.

A comparative study of modified cotton biochar and activated carbon based catalysts in low temperature SCR

Fuel ◽  
2015 ◽  
Vol 156 ◽  
pp. 47-53 ◽  
Author(s):  
Boxiong Shen ◽  
Jianhong Chen ◽  
Shiji Yue ◽  
Guoliang Li
Keyword(s):  
Activated Carbon ◽  
Low Temperature ◽  
Comparative Study ◽  
Low Temperature Scr ◽  
Carbon Based
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