Characterization of maleated vegetable oils for insulation purposes and agricultural applications

Abstract

Two maleated vegetable oils based on castor and soybean oils (COMA & SOMA) in addition to aliphatic polyester based on propylene glycol and succinic acid (PPS) were prepared and characterized by means of infrared (IR), nuclear magnetic resonance ( 1 H NMR) and thermogravimetric analysis (TGA). TGA data indicates that SOMA is more thermally stable than COMA and PPS. The electrical properties of the prepared materials were investigated through the permittivity (e'), the dielectric loss (e'') and the electrical conductivity (s) in a frequency range 10 -1 -10 +7 Hz. The obtained data were found to follow the trend COMA > SOMA > PPS. The relaxation mechanisms of such systems were also studied through the dielectric modulus M', including the real and imaginary parts (M' and M''). The effect of the prepared materials on the hydrophysical properties of the sandy soil when supplemented with different concentrations (1-5 wt %) was studied by bulk density, total porosity, water holding capacity, field capacity, hydraulic conductivity and water stability aggregates. These hydrophysical properties were improved by increasing the concentration of the added materials, which can be explained in terms of the penetration resistance in relation to friction and cohesion forces. These improvements in the hydrophysical properties of the sandy soil render it suitable for plant growth.

Biophysical properties of polymethyl methacrylate blended with maleated castor oil filled with Calcium Carbonates in the micro and nano scales

“…9 and 10 for the micro and nano CaCO 3 . The decrease in τ 1 and τ 2 noticed by increasing either the filler content or temperature could be attributed to the increase in the conducting nature of the blend [15]. This decrease is found to be started sharply up to 60 o C after which a slight decrease is noticed.…”