Environmental Recovery by Magnetic Nanocomposites Based on Castor Oil - Natural Polymers, Biopolymers, Biomaterials, and Their Composites, Blends, and IPNs - page 246

table 2. Characteristic bands of alkyd resins.

Region (cm -1 ) Phenomenon

1720 C=O axial deformation; carbonyl group

1600-1580 Aromatic ring-Axial deformation doublet

1266 C-O axial deformation

1070 Aromatic ring “in plane” deformation

741-705 Aromatic def. associated with the presence of polyester

All bands are typical of the alkyd resins (Souza Jr. et al., 2010b; Lopes et al.,
2010). The spectrum of the pure resins present characteristic bands at 1720 cm -1 , re-
lated to the C=O axial deformation of the carbonyl group; at 1,600 and 1,580 cm -1 ,
related to axial deformation of the aromatic ring; at 1,266 cm -1 related to the C-O axial
deformation; at 1,070 cm -1 , related to the “in plane” deformation of the aromatic ring
and at 741-705 cm -1 , related to the aromatic deformation associated with the presence
of polyester (Souza Jr. et al., 2010b).

Composite Production
To prepare the composite, each one of the obtained alkyd resin was milled and fused.
Afterwards, maghemite nanoparticles were mixed with the resin to obtain a com-
posite containing 5 wt% of maghemite. This proceeding is schematically shown in
Figure 14.

Figure 14. Schematic proceeding to obtain the magnetic composite containing 5 wt% of maghemite
nanoparticles.