Characterization of maleated vegetable oils for insulation purposes
and agricultural applications (in English)
Polimery 2014, No 10, 729
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 (1H 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.