2.4.2. Products Analysis and Performance Evaluation
Products were. analyzed using gas chromatographs (GC) (Agilent 6890 plus
HP) on the capillary column (HP-30 50% phenyl/50% dimethyl
polysiloxane, 30 meter in length, 0.53 mm in internal diameter and 0.32
mm in film thickness) and a flame ionization detector (FID) with
nitrogen as the carrier gas and isopropanol was used as the internal
standard.
All samples were transformed into silane derivatives with BSA (N,O-bis
(trimethylsilyl) acetamide). The program involved holding the
temperature at 80◦C for 2 min, then heating to 340◦C at
5◦C/min, and then finally holding at
340◦C for 5 min. The injector was held at
300◦C, while the detector was at
360◦C.
\begin{equation}
\text{Selectivity\ }\left(\%\right)=\frac{Obejective\ product\ \%}{\text{Total\ conversio}n\ \%}X100\ \ldots\ldots\ldots\ldots..(1)\nonumber \\
\end{equation}\begin{equation}
Total\ Conversion\ =100-\left(Final\ \%\ of\ TMP+Final\ \%\ of\ OA\right)\ldots\ldots\ldots\ldots\ldots\ldots(2)\nonumber \\
\end{equation}Kinematic viscosity was measured at 40 and 100°C using calibrated
Ubbelohde Viscometer tubes. Viscosity and viscosity index (VI) were
calculated using ASTM D 445 and ASTM D 2270 methods, respectively. All
viscosity measurements were run in duplicate and the average value was
reported. Pour points were determined according to ASTM D 97. Sample
temperature was measured in 3 °C increments at the top of the sample
until it stopped pouring.