3.3.2. Viscosities of the synthesized PKO biolubricants samples
at 40 °C and at 100 °C
The viscosities of PKO biolubricants synthesized by transesterification
with TMP PKBLT were 42.53 cSt at 40 °C and 10.65 cSt at
100 °C, respectively. Similarly, the viscosities of PKO biolubricants
synthesized by epoxidation-esterification PKBLE were
44.69 cSt at 40 °C and 11.42 cSt at 100 °C, respectively. From the
values in Table 1, it could be seen that viscosities values of the
PKBLE sample were comparatively higher than those of the
PKBLT sample. For the PKO sample, its viscosity was
lower than the values reported for PKO and palm oil, by Alang et al.
[1] and Reddy et al. [43], respectively. However, the PKO sample
viscosity was lower than the value reported for Jatropha oil by Menkiti
et al. [4]. These values for PKO biolubricant samples were less than
those of biolubricant from PKO reported as 480.63 cSt at 40 °C and 20.54
cSt at 100 °C, by Alang et al. [1]. Also, the values of the
viscosities of PKO biolubricants in this work were lower, when compared
to Jatropha bio-lubricants with values of 55.17 cSt at 40 °C and 10.96
cSt at 100 °C, as reported by Bilal et al. [44]. The values for PKO
biolubricant are comparable with those of petroleum lubricants which
were evaluated to be 46.476 cSt and 6.940 cSt, at 40 °C and 100 °C,
respectively. However, it is vital to state that the viscosities at 100
°C of the PKO bio-lubricants samples obtained in this work were greater
than that of the petroleum lubricants. As such, the synthesized PKO
biolubricants exhibits greater thermal stability and can endure greater
mechanical stress than petroleum lubricants.