Fourier transform infrared (FT-IR) analysis
The FTIR spectrum of R05 showed weak hydrogen
bond absorption at 3319 cm1 (Fig. 7). There are two
types of hydrogen bonding that exist in this polymeric
system, intermolecular and intramolecular hydrogen
bonding amongst polymers. While the incorporation of
ENR-50 in R05, abbreviated as R05 ENR-50, indicated
stronger hydrogen bonding at 3328 cm1 than R05, it also
indicated that more intermolecular and intramolecular
hydrogen bonds existed in the polymeric system [32].
This was caused by the presence of ENR-50 in this
compound, which provided more oxygen in the rubber
blend through the oxirane group. The oxirane acts as the
polar group and has a tendency to promote more
hydrogen bonds with the nitrile group from NBRr, while
the isoprene group from ENR-50 has good compatibility with C]C from SBR. This proves that ENR-50 is compatible
with rNBR through the oxirane group and with SBR
through the isoprene group.
Incorporating ENR-50 into R50, abbreviated as R50 ENR-
50, shifted the absorption band of R50 at 1535 cm1 to
1589 cm1 (Fig. 7). This strongly correlated with the rise of
amine in the region from 1640 to 1560 cm1 [33] by the
formation of crosslinks of NBRr with the oxirane ring
opening of ENR-50 through sulfur linkage, as proposed in
Fig. 8. The hydrogen bond absorption intensity of R50 ENR-
50 at 3312 cm1 also showed a slight increase compared to
R05 at 3276 cm1 in tandem with a rise of amine. This is
because the amine itself has a tendency to form hydrogen
bonding among oxygen and hydrogen of the polymeric
structure. The total number of hydrogen bonds was also
due to the formation of hydrogen bonds of hydroxyl from
the oxirane ring opening reaction of ENR-50.
3.3.2. Differential scanning calorimetry (DSC) analysis
A DSC thermogram of the neat SBR shows Tc occurred at
36.1 C. At this Tc, the temperature range was quite narrow
because the crystallization of the polymer chains was not
interrupted by the impurities (Fig. 9). Tc for NBRr (36.1 C)
was shown at the same temperature as SBR due to the
presence of additives during manufacturing of NBR
Fourier transform infrared (FT-IR) analysis
The FTIR spectrum of R05 showed weak hydrogen
bond absorption at 3319 cm1 (Fig. 7). There are two
types of hydrogen bonding that exist in this polymeric
system, intermolecular and intramolecular hydrogen
bonding amongst polymers. While the incorporation of
ENR-50 in R05, abbreviated as R05 ENR-50, indicated
stronger hydrogen bonding at 3328 cm1 than R05, it also
indicated that more intermolecular and intramolecular
hydrogen bonds existed in the polymeric system [32].
This was caused by the presence of ENR-50 in this
compound, which provided more oxygen in the rubber
blend through the oxirane group. The oxirane acts as the
polar group and has a tendency to promote more
hydrogen bonds with the nitrile group from NBRr, while
the isoprene group from ENR-50 has good compatibility with C]C from SBR. This proves that ENR-50 is compatible
with rNBR through the oxirane group and with SBR
through the isoprene group.
Incorporating ENR-50 into R50, abbreviated as R50 ENR-
50, shifted the absorption band of R50 at 1535 cm1 to
1589 cm1 (Fig. 7). This strongly correlated with the rise of
amine in the region from 1640 to 1560 cm1 [33] by the
formation of crosslinks of NBRr with the oxirane ring
opening of ENR-50 through sulfur linkage, as proposed in
Fig. 8. The hydrogen bond absorption intensity of R50 ENR-
50 at 3312 cm1 also showed a slight increase compared to
R05 at 3276 cm1 in tandem with a rise of amine. This is
because the amine itself has a tendency to form hydrogen
bonding among oxygen and hydrogen of the polymeric
structure. The total number of hydrogen bonds was also
due to the formation of hydrogen bonds of hydroxyl from
the oxirane ring opening reaction of ENR-50.
3.3.2. Differential scanning calorimetry (DSC) analysis
A DSC thermogram of the neat SBR shows Tc occurred at
36.1 C. At this Tc, the temperature range was quite narrow
because the crystallization of the polymer chains was not
interrupted by the impurities (Fig. 9). Tc for NBRr (36.1 C)
was shown at the same temperature as SBR due to the
presence of additives during manufacturing of NBR
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