The thermal degradation of polypropylene (PP), polyacrylonitrile butadiene styrene (ABS), polyurethane (PU) and polyvinyl chloride (PVC) have been studied in the presence of copper, iron oxide and dirt. The rate constants and kinetic parameters for the degradation processes have been measured using...
S. Virtanen, in Tribocorrosion of Passive Metals and Coatings, 2011 1.1 Introduction All materials are prone to aging and degradation when in use in different types of applications. These processes lead to time-dependent deterioration of their functionality. The negative effects of materials degradation...
关键词: oxidoreductions, chimie du sol, metal, metals, degradation, volatility, contamination chimique, oxydoreduction, transport dans le sol, chemical contamination, precipitation chimique, chemical precipitation, soil transport processes, soil chemistry, volatilite 年份: 1994 收藏...
The processes were monitored by surface tension measurements, by total organic carbon (TOC) assays and carbon dioxide evolution. Some hydroxylated intermediates of the BDDAB system were identified by TOF-MS techniques. The degradation of the anionic surfactants was significant involving prior adsorption ...
Lesiuk, G., Szata, M., Fatigue properties and fatigue crack growth in puddled steel with consideration of microstructural degradation processes after 100-years operating time, XVII International Colloquium on Mechanical Fatigue of Metals (ICMFM17), Procedia Engineering, 74 (2014) 64-67. DOI:...
This phenomenon has been the subject of intensive study, and potential strategies for mitigating its eects include the use of recovery anneals, barrier layers, optimized electrode structures, and modied deposition processes for contact metals and inter-layer dielectrics. The emphasis of this ...
Figure 27 illustrates the wetting processes of CMAS/YSZ coatings at 1275 °C. The initial contact angles for as-sprayed and polished coatings were 135° and 118°, respectively, with the former attributed to higher surface roughness. The laser-ablated coating had an initial angle of 85°. ...
Relative to ferrous materials, the production processes of non-ferrous materials generated less corrosion issues. Based on the survey results from typical aluminium and copper producers, direct corrosion costs represented 0.60% of the gross production value. Thus, the direct corrosion cost was 30.78 bi...
In the mouth, chemical degradation is a complex process (thermolysis, oxidation, solvolysis, photolysis, and radiolysis), which include disintegration and dissolution of materials in saliva. Of the listed chemical processes, solvolysis is likely the most relevant to current dental composites (Santerre ...
Metals play a very large role in metabolic processes. It has been stated: “There probably does not exist a single enzyme-catalysed reaction in which either substrate, product, enzyme, or some combination within the triad is not influenced in a very direct and highly specific manner by the pr...