Biomedical Engineering Reference
In-Depth Information
The obtained composites were analyzed by FTIR spectroscopy and their spectra
were compared to pure alkyd resin ones, as shown in Figure 15. The characteristic
bands of the composites are presented in Table 3.
Figure 15. The FTIR spectra of composite (RAM01) and pure alkyd resin (RA01A and RA01B).
table 3. Characteristic bands of composite and alkyd resin.
Region (cm -1 )
Phenomenon
3420
O-H stretch related to hydrogen bond
2900
C-H axial deformation of the C-H (CH 2 and CH 3 groups)
1727
C=O axial deformation.
1215
C-O axial deformation
1045
Axial deformation of the C-O-C bonding
The spectra of the biocomposites do not present any significant differences, when
compared to the spectrum of the matrix, probably indicating the absence of significant
chemical interactions between the matrix and the filler (Lopes et al., 2010).
The XRD results, shown in Figure 16, suggest that the mono-domains of the par-
ticles are not changed, since the crystallite size (calculated using the 311 plane @ 2θ
= 37.2°) of the pure maghemite and of the particles present inside the resin, obtained
using the Scherrer equation, are equal to (17 ± 2) nm and (21 ± 2) nm, respectively.
As previously said, each one of the resins obtained from the DoE was used to
prepare the composites. Therefore, the effect of the studied factors--castor oil and
phthalic anhydride amounts over magnetic force of the composites was evaluated. The
Table 4 and the Figure 17 show that the increasing of castor oil amount increases the
magnetic force. On the other hand, the same effect is caused by the decreasing of
 
 
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