Global Journal of Researches in Engineering, J: General Engineering, Volume 22 Issue 1

lobal Journal of Researches in Engineering ( ) Volume XxXII Issue I Version I J G 11 Year 2022 © 2022 Global Journals ii. TG/DSC curves obtained from the recordings of each tube We obtain from figure 6 that the point P which is the particular point representing the meeting of the TG and DSC thermograms of the tubes of each formulation is totally different from each other justifying the differences in the thermal results of the tubes of each formulation. We obtain that the temperatures of P0, P12.54, and P32.01 are very close explaining that the thermal behaviors will also be different but close. The point P51.01 is very low, below 400°C while the other points are almost above this temperature, we can undoubtedly understand that the 4 materials will have a tendency to present a ductile mechanical behavior for low loads in palm kernel shell powder as from F0 to a neighborhood of F12.54, that the material of the tubes F31.01 and its neighborhood will have a tendency to a semi-fragile behavior and those of F51.01 will have a tendency to a fragile behavior. Moreover, we note that all the tubes have the start of the recordings higher than 0 (zero), which means that the start of the analyses is a function of the temperature at the time of the tests (ambient temperature). But this ambient temperature does not affect the quality of the results of the analyses. Also, we obtain that all the temperatures of phase change that it is in the TG as in the DSC, as close as it is, are all different. Finally, let us point out the very strong heat absorption of the overloaded tubes (F51.01) before the relaxation. This can be explained by the work on the characterization of dura palm kernel shells from Cameroon as a load for synthetic polymers: case of PVC [8] where we note that palm kernel shells absorb heat slowly and retain it for a long time while PVC absorbs heat quickly and calcines quickly. This explains the double enthalpy relaxation when the PVC is overloaded and the amount of heat required to reach the ash high. From the data of the recordings, we present the separate TG and DSC thermograms of the tubes in order to better observe the physical behavior of the materials and the evolutions of the heat absorption until the degradation. This will allow us to highlight the results resulting from the analysis of each material at different phase changes [5] . -120 -100 -80 -60 -40 -20 0 20 -20 0 20 40 60 80 100 120 140 160 0 100 200 300 400 500 600 700 800 Mass loss of the tubes (%) Temperature (°C) TG/DSC thermograms of unloaded PVC tubes and loaded PVC tubes with palm kernel shells. DSC of F0 tubes DSC of F12.54 tubes DSC of F32.01 tubes DSC of F51.02 tubes TG of F0 tubes TG of F12.54 tubes TG of F32.01 tubes TG of F51.02 tubes Ambient temperature: temperature at the beginning of the tests. P51.02 P32.01 P12.54 P0 Mathematical Models for the Calculation of the Thermal Properties of PVCs as a Function of Dosage with the Load of Palm Kernel Shell Powder from the Results of Experimental Practice Figure 6: TG/DSC thermogram of all tubes We note for the 4 curves that the particular point which marks the temperature at which the TG curve meets the DSC curve is totally different for all formulations. This divergence reassures that the thermal characteristic parameters of the material will be different from one formulation to another. This explains precisely why palm kernel shell powder influences the thermal properties of PVCs loaded with palm kernel shell powder