Some biophysical properties of castor oil esterified with some acid anhydrides

Abstract

A series of castor oil adducts were synthesized by esterification of castor oil with acid anhydrides: phthalic, maleic and succinic anhydrides. The chemical structure of castor oil and the prepared adducts were characterized by means of IR and 1 H NMR spectroscopy. The number-average and weight-average molecular weights were measured by gel permeation chromatography. The electrical properties were studied through the permittivity, dielectric loss and conductivity measurements, which are considered to be in the range of electrical insulation. The electrical conductivity, which describes the ionic mobility of the systems, was found to be in the range of 10 -9 to 10 -12 S/cm. This indicates that castor oil and its esters could be used for antistatic applications. The viscosity Z and the activation energy E Z , obtained from the dependency of viscosity on temperature using the Arrhenius equation, were found to increase with increasing molecular weight of the system. The effect of different concentrations of castor oil and its esters on the growth activities of the sugar beet pathogens R. solani and S. rolfsii was studied through the determination of percent germination, average length of hyphal extensions, dry mass yield and the production of sclerotia. The obtained data indicate that the esterification of castor oil with anhydrides improves the antifungal activity.

Novel bio-based flexible epoxy resin from diglycidyl ether of bisphenol A cured with castor oil maleate

“…The 1 H-NMR signals have been attributed according to the literature. 23,24 In the CO spectrum the signals from 0.78-1.70 ppm are specic to -CH 3 and -CH 2 protons from a, b and f positions. The methine proton connected to the hydroxyl group from c position has a signal located between 3.4-3.8 ppm.…”

Potential generation of nano-sized mist by passing a solution through dielectric barrier discharge

“…These differences in the discharge characteristics might be due to the electrical conductivity 22 . This notion is supported by the fact described below that there is a marked difference in physical and chemical characteristics between UPW or castor oil, which has a low conductivity 23 , 24 , and PBS with a high conductivity. Moreover, the changes in electrical conductivity of UPW by generation of chemical species induced a slight difference in the discharge characteristics between UPW and castor oil.…”

Vegetable oils and their derivatives

“…[8][9][10][11][12][13][14][30][31][32] Table 3.3 shows the fatty acid compositions, botanical names, oil content and some physical properties of a few important vegetable oils.…”

“…Polymers have been used since the 19th century in paint manufacture and other applications, but during the last decade, investigation into vegetable oil-based polymers [9][10][11][12][13][14][15] has been directed towards other purposes. Since the onset of the petroleum shortage, the preparation of polymers from renewable sources has become indispensible.…”

“…A large number of vegetable oils, including castor, linseed, soybean, sunfl ower, argemone, corn, canola, palm, tobacco, Mesua ferrea, coconut, jathropa, saffl ower and rubber have been used in the successful synthesis of different categories of polymers. [8][9][10][11][12][13][14] …”