caa a22 4500 463193024 CHVBK 20180406164914.0 cr unu---uuuuu 170326e20070301xx s 000 0 eng 10.1007/s10973-006-7773-1 doi (NATIONALLICENCE)springer-10.1007/s10973-006-7773-1 Thermal,spectroscopic and rheological study of mineral base lubricating oils [Elektronische Daten] [J. Santos, L. Lima, Iêda Santos, A. Souza] The thermal degradation process of mineral base lubricating oils was studied in this work by means of thermal, spectroscopic and rheologic analysis. The lubricating oils were degraded at temperatures varying from 150 to 210°C, and for degradation times from 1 to 48 h. After the degradation, the lubricating oils were characterized by X-ray fluorescence, IR and NMR spectroscopies, rheological properties and thermal analyses (TG/DSC). The spectroscopic analyses determined the oxidation reaction products. TG curves indicate that the thermal stability of lubricating oils is below 161°C. TG curves in air present three mass loss stages, whereas in nitrogen there are only two mass loss steps. DSC analyses in air indicate two highly exothermic peaks related to hydrocarbon oxidation and combustion processes, while in nitrogen only two endothermic peaks were observed. The decrease in the degradation temperature led to a decrease of the lubricant viscosity. Springer-Verlag, 2007 degradation nationallicence mineral base lubricating oil nationallicence rheology nationallicence thermal analysis nationallicence Santos J. Unidade Acadêmica de Educação, CES, UFCG, 58175-000, Olho D'água da Bica, Cuité, Paraíba, Brazil aut Lima L. Unidade Acadêmica de Engenharia Química, CCT, UFCG, 58109-970, Campina Grande, Paraíba, Brazil aut Santos Iêda Departamento de Química, CCEN, UFPB, 58059-900, João Pessoa, Paraíba, Brazil aut Souza A. Departamento de Química, CCEN, UFPB, 58059-900, João Pessoa, Paraíba, Brazil aut Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers 87/3(2007-03-01), 639-643 1388-6150 87:3<639 2007 87 10973 https://doi.org/10.1007/s10973-006-7773-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10973-006-7773-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Santos J. Unidade Acadêmica de Educação, CES, UFCG, 58175-000, Olho D'água da Bica, Cuité, Paraíba, Brazil aut NATIONALLICENCE 700 1- Lima L. Unidade Acadêmica de Engenharia Química, CCT, UFCG, 58109-970, Campina Grande, Paraíba, Brazil aut NATIONALLICENCE 700 1- Santos Iêda Departamento de Química, CCEN, UFPB, 58059-900, João Pessoa, Paraíba, Brazil aut NATIONALLICENCE 700 1- Souza A. Departamento de Química, CCEN, UFPB, 58059-900, João Pessoa, Paraíba, Brazil aut NATIONALLICENCE 773 0- Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers 87/3(2007-03-01), 639-643 1388-6150 87:3<639 2007 87 10973 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer