نتایج جستجو برای: synthetic rubber
تعداد نتایج: 158366 فیلتر نتایج به سال:
BACKGROUND Concerns about the possible toxic effects of workplace exposures in the synthetic rubber industry have centered on 1,3-butadiene (BD), styrene and dimethyldithiocarbamate (DMDTC). Our previous mortality studies of over 17,000 male synthetic rubber workers found an excess of leukemia that may be due to BD or BD plus other chemicals. Experimental studies have shown that BD produces mam...
In the annals of history the evolution of the synthetic rubber industry can be traced to the early 1930s where the first emulsion polymerised styrene butadiene rubber known as Buna S was prepared by I. G. Farbenindustrie in Germany. But it was not until the US Government in 1940 established the Rubber Reserve Company, a stockpile of natural rubber and the development of a synthetic rubber progr...
In previously reported experiments, the car cinogenic potency for mice of extracts of processed rubber was traced to the presence of 3,4-benz pyrene and related compounds (13). A search for the origin of these hydrocarbons was next under taken. Samples of crude rubber, both natural and synthetic, did not contain any of these hydrocar bons when they were sought by extraction, chro matography, an...
Introduction: The acoustic performance of natural fiber adsorbents has been investigated in numerous studies. A part of these materials show a poor adsorption within the frequency range of less than 1000 Hz. In the present study, attempts were made to investigate the effect of layout sequence of double-layered composites consisting of natural and synthetic fibers on improving the acoustic adsor...
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