Analysis, Composition and Structure of Rubber and Rubber Products

1967 ◽  
Vol 40 (1) ◽  
pp. 238-270 ◽  
Author(s):  
Wlllard P. Tyler

Abstract Seven years has passed since the review of methods of analysis of rubber and rubber products by Burger was published in this Journal. At that time the author covered a broad field of endeavor with special emphasis on classical methods of analysis. He also foresaw the future of instrumental techniques, many of which were only beginning to be useful in rubber chemistry. The questions that must be answered today seem to us, from the vantage point of seven years of remarkable progress, to be more complex. Which new techniques have proved to be most useful in helping the analytical chemist to solve daily problems of analysis of his own and his competitors' products? Which techniques are giving him a tool to study the relation between composition, structure, and properties of rubbers? Which techniques can help the polymer chemist to better chart his course in the search for new and better elastomers? The new techniques, and a few of the old ones, have advanced so rapidly in the last decade that it is presumptuous to think that we can answer these questions completely in a review paper. What, then, is the purpose of this review? We could prepare a complete bibliography and comment briefly on the more important papers. But this has been adequately done, with a very broad scope, in the reviews appearing in Analytical Chemistry every two years. We feel this approach would be redundant. We have chosen, instead, to attempt to cover available techniques from the standpoint of what can be done with them in several important areas, using key papers from the literature as a basis. Our added comments are the result of years of experience in the ceaseless quest for the best use of analysis and structure-determining tools in advancing research, development, and production in the field of elastomers.

2021 ◽  
pp. 470-475
Author(s):  
A.I. Kovtunov ◽  
A.G. Bochkarev

The results of the study of the processes of argon-arc surfacing of alloys based on titanium aluminides doped with chromium are presented. The effect of surfacing modes on the chemical composition and structure of the deposited alloys has been established. The results of testing the hardness, wear resistance and heat resistance of chromium-alloyed alloys based on titanium aluminide are presented.


2020 ◽  
pp. 234-240
Author(s):  
V.A. Levchenko ◽  
Yu.V. Panfilov

Tendency of strengthening coatings on cutting tools processes evolution is analyzed. Manifold of strengthening materials, strengthening coatings deposition methods, process and analytical equipment for coatings manufacture and measurement of it’s properties is described. International standards for strengthening coatings on cutting tools composition, structure and properties are presented.


Author(s):  
T. I. Bobkova ◽  
B. V. Farmakovsky ◽  
N. A. Sokolova

The work deals with topical issues such as development of composite nanostructured powder materials. The results of creating powders based on the system “aluminum–nitride of silicon” are presented. Complex investigations of the composition, structure and properties of powder materials, as well as coatings formed on their basis by supersonic cold gas dynamic spraying, were carried out. It has been found that the high-energy treatment of a powder mixture of aluminum with nanofibers of silicon nitride provides the formation of a composite powder in which a new phase of the Si(1-х)AlхO(1-х)Nх type is formed, which additionally increases the hardness in the coatings to be sprayed.


2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Jinlong Jiang ◽  
Qiong Wang ◽  
Yubao Wang ◽  
Zhang Xia ◽  
Hua Yang ◽  
...  

The titanium- and silicon-codoped a-C:H films were prepared at different applied bias voltage by magnetron sputtering TiSi target in argon and methane mixture atmosphere. The influence of the applied bias voltage on the composition, surface morphology, structure, and mechanical properties of the films was investigated by XPS, AFM, Raman, FTIR spectroscopy, and nanoindenter. The tribological properties of the films were characterized on an UMT-2MT tribometer. The results demonstrated that the film became smoother and denser with increasing the applied bias voltage up to −200 V, whereas surface roughness increased due to the enhancement of ion bombardment as the applied bias voltage further increased. The sp3carbon fraction in the films monotonously decreased with increasing the applied bias voltage. The film exhibited moderate hardness and the superior tribological properties at the applied bias voltage of −100 V. The tribological behaviors are correlated to the H/E or H3/E2ratio of the films.


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