3.6. Infrared spectroscopic study
Fig. 11 shows the results of the FTIR spectroscopic study
on the vulcanisates of A/0.0 and D/5.0, the control and the
control with 5.0 phr. of ALK. All the figures show that the C–
H stretches above and below 3000 cm1
, indicating that the
vulcanisates has saturated and unsaturated portions [7].
The strong bands occurred around 2954-2956 cm1
,
2916 cm1 and 2848 cm1
, which are attributed to the
symmetric and asymmetric stretching vibration of the C–H
bonds based on CH2 and CH3. Also, the bands at 1538 cm1
and 1456 cm1 are related to the bending vibration of the
methylene (CH2) and methyl (CH3) groups, respectively.
The spectra clearly show the characteristic wavenumbers of
the NR vulcanisates. These characteristic wavenumbers of
the NR were also reported by Wang et al. [30] for starch/NR
composites, and Ooi et al. [31] for oil palm ash filled NR
vulcanisates.
Fig. 11(a) shows that the