Surface reactivity and layer analysis of chemisorbed reaction films in the surface-chemical environment of alkyl octadecenoates

Abstract

Studies on surface reactivity of substrate iron (Fe-particles) were made in the tribo-chemical environment of alkyl octadecenoates. Two alkyl octadecenoates namely ethyl octadecenoate and methyl 12-hydroxy octadecenoate, slightly different in their chemical nature, were taken for preparing the chemisorbed reaction films (CRF) at the temperature 100 ± 5°C. The reaction products collected in the composite (amorphous) phase were isolated into three different solvent-soluble fractions (sub-layer films) using polar solvents of increasing polar strength. The FTIR analysis of these films showed that these were primarily organic in nature and were composed of alkyl and/or aryl hydroxy ethers, unsaturated hydroxy ketones, and aromatic structures chemically linked with iron surface. These reaction films also contained large amount of iron (Fe). Further, these film fractions also showed varying thermal behaviour during thermal decomposition in the temperature range of 50-800°C when thermally evaluated in the nitrogen environment.

Untitled

“…LC blended samples (M1 to M6) showed better AW performance (lower WSD) compared to M in both the base oils at every concentration. It is also observed that in most of the cases, samples (M1, M2, and M3) containing LCs with more aromatic rings [19] and ester (-COO) functionality [20,21] in their structure (I, II, III) showed much better AW performances compared to the others. This is in agreement with our earlier observation [9].…”

Synthesis and study of polycyanurates based on 2-carbazol-4,6-dichloro-s-triazine

“…The frequencies in the 1260-1190 cm À1 region may be attributed to vibrations involving the aryl-ether linkages. [16][17][18][19][20] Two distinct bands, observed at approximately 1330 and 1340 cm À1 , respectively, along with several bands in the 1600-1590 cm À1 region are attributed to the aromatic C-N stretching linkage. The bands in the region of 1490-1400 cm À1 are attributed to the skeletal ring-stretching vibrations of the aromatic and heteroaromatic rings.…”

FTIR micro‐reflectance absorption spectroscopic analysis of chemisorbed reaction films for tribological applications

“…communicated a review on the action mechanisms for boundary lubrication additives and lubrication potential of boron compounds. They also reported the research activities on the anti‐wear and anti‐friction characteristics of tribo‐chemical film . In addition, investigation on the compositional analysis of surface layer, thermal decomposition of ZDDP on stainless steel surface and infrared (IR) spectroscopic study of tribo‐chemical film were extensively reported in early nineties .…”

“…They also reported the research activities on the anti-wear and anti-friction characteristics of tribo-chemical film. 31,32 In addition, investigation on the compositional analysis of surface layer, thermal decomposition of ZDDP on stainless steel surface and infrared (IR) spectroscopic study of tribo-chemical film were extensively reported in early nineties. [33][34][35] On the basis of this literature search, it is summarised that the action mechanisms for tribo-chemical film explained by different research communities are varying in its schematic presentations.…”