The densities and viscosities of the methyl esters of hexanoic, heptanoic, oetanoic, decanoic and dodecanoic acids were determined at temperatures ranging from 10 to 80~ at 5~ intervals. The densities of the methyl esters vary linearly with temperature. When fluidities were plotted against molal volumes of the esters, smooth curves were obtained. Intrinsic volumes were determined by extrapolation to zero fluidity. Based upon Hildebrand's equation, the B values, which represent a measure of the molecules resisting transport of momentum, were calculated for each ester and found to be exponentially related to the temperatures. A modified equation relating the fluidity with temperature was formulated. Excellent agreement was obtained between calculated and experimental fluidities.We report here the densities and viscosities of five pure methyl esters of n-alkanoic acids at 15 temperatures and our attempt to correlate the viscosity with the temperature by using a modified form of Equation 1. EXPERIMENTAL PROCEDURESAnalytical reagent-grade methyl esters of C6 to C12 fatty acids with better than 99% purity from Sigma Chemical Ca (St. Louis, MO) were redistilled and dried over molecular sieve before use.The density and the viscosity were determined with a 10-mL flask-type pycnometer and an Ubbelohde viscometer, respectively. The details were described previously (7).
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