Thin film testing of biodiesel degradation residues and their solubility

Time–temperature superposition for kinetic mapping of solventless autocatalytic addition of diisocyanates and macrodiols

“…Briefly, the macrodiol was diluted in isopropanol and titrated using a 0.01 M solution of KOH and a phenolphthalein indicator as described previously. 8,9…”

Short-term and long-term volatilities of films from polyol ester and ether-based oils of various molecular weights

“…Long-term vaporization tests were performed using methodology, described previously [6,7]. Low carbon steel coupons were coated with 500 µm thick films of test fluids and heated in a forced-draft oven (Memmert GmbH, Germany) at 90, 120 or 140°C.…”

“…Several variants of the NOACK tests exist, three of them being described in ASTM D5800 with the sample volume in the container varying from 60 ml to 120 ml. Therefore, the TGA procedure has received significant recognition [5] For evaluation of long-term vaporization, thin film degradation tests can be performed [6], [7]. Oil films are exposed to abundant metal surface and availability of air oxygen, therefore their degradation proceeds much faster than in bulk.…”

“…There are several mechanisms of decomposition: oxidative, hydrolytic, microbial, etc. In this study only oxidative decomposition is considered, employing ambient air without specifically studying hydrolytic effects, which might also be quite significant [7]. Oleic moiety is selected to represent unsaturated derivatives, concurrently with squalene and squalane.…”

Conversion of fatty acid methyl esters into dibasic esters by metathesis and their lubricant properties

“…Oxidative degradation was screened using a thin lm oxidation procedure as described in detail previously. 20,21 Vapor losses were measured gravimetrically by placing the oil sample in a lm of 500 mm thickness on a steel coupon and heating it at 120 C under ambient humidity. The coupons were weighed periodically to monitor the vaporization rate.…”