Environmental Recovery by Magnetic Nanocomposites Based on Castor Oil - Natural Polymers, Biopolymers, Biomaterials, and Their Composites, Blends, and IPNs - page 245

Figure 12. Optical micrography of the obtained alkyd resin.
The resin preparation was carried out using an experimental design, where the
studied factors were the amount of the castor oil amount and the phthalic anhydride.
The glycerin amount was always kept constant. This DoE was performed using a two
factor experimental design at two levels plus a central point (2 2 + 0), yielding eleven
experiments, where the lowest and highest levels were performed in duplicates and the
central point in triplicate.
The obtained resins were analyzed by FTIR spectroscopy. The obtained spectra
do not show significant differences among the resins and two of them are presented in
Figure 13. The characteristic bands of resins are showed in the Table 2.
Figure 13. The FTIR spectra of alkyd resins.