## 3 Results and Discussion
### Thermomechanical Property Tests  
Figure 8 illustrates the outcomes of the tensile tests, highlighting the distinct mechanical behavior of the CAG based on its composition, specifically, the CoP/polymer ratio. With an increase in the CoP content, the value of the elastic modulus (Young's modulus) does not vary significantly with respect to the virgin polymer except in the 20% mixture, which presents a particular dispersion of the average values. However, it is also the one that presents the greatest deviations, probably due to the lower amount of CoP load in this mixture, as the rigidity is not affected as a consequence of providing a reinforcing characteristic to the polymer [34; 35], without using a coupling agent like MAPP [36], and using a PP with similar mechanical properties. This phenomenon is revealing considering that the CoP content is increased by up to 35%. Only a slight decrease in the modulus in the 20% mixture stands out, coinciding with the same phenomenon that occurred in the stress, and an inverse phenomenon emerges from the elongation. However, if the minimum and maximum values of the error range or standard deviations are compared, it is possible to confirm the regularity of this mechanical property of CAG. It should be observed that the recorded value for the pure PP remains consistent with the one presented in Table 2, stemming from the temperature treatments applied during the extrusion and injection processes. However, it is in this mixture that the greatest dispersion has been achieved, noting that the maximum value of the range is similar to the average of the previous mixture. This observed phenomenon can be elucidated by considering the microstructural characteristics identified in the CAG. As mentioned earlier, the SEM analysis revealed interlinked fibrillated polymer structures formed due to the inclusion of CoP, along with the development of small voids/cavities. At the microscale, these voids/cavities and fibrils demonstrate resilience against substantial deformation prior to failure, thereby improving the material's ductility and hindering crack propagation. Therefore, the stability of the elastic modulus in the CAG with varying CoP content signifies the reinforcing role played by solid byproducts/wastes within the polymeric matrix, as reported by other researchers [37]. Figure 7: Graphical representation of the CoP particle size curve. The data were subjected to parametric ANOVA tests within each dataset (n = 22), resulting in a significant Snedecor F value (F = 13.86) at a significance level of \(p<0.05\). Consequently, the time groups demonstrated an effect on the variable response (Young's modulus). The stress at break exhibited a slight decrease with the addition of the residue [37,38]. As depicted in Figure 9, the incorporation of CoP led to a reduction in stress, with decreases of 15.8% and 28%, showing a slight decline for composites with 20 wt.% and 30 wt.% of filler compared to the processed raw polymer. Subsequently, the strain at break displayed a gradual recovery for higher filler contents up to 35%. This phenomenon reveals the stability of the agrocomposite when mixed with the load, in the same way as the elastic modulus. There is a slight increase in the elongation in the load mixes (20:80 and 35:65). It is strange that the elongation does not follow a decreasing trend with the increase in the load percentage, since, with this, it would also increase its fragility, a phenomenon that did not occur in this test. These phenomena of trend changes in the CAG blends may be attributed to the particle size of the CoP, as described in [39]. Figure 8: Mechanical properties of the agrocomposites. (**a**) Young’s modulus, ET; (**b**) % elongation and stress at break. (0%: PPC 5660; 0%p: processed PPC 5660; 20%: CoP20 PP80; 30%: CoP30 PP70; 35%: CoP30 PP70). Figure 9: Impact test (Charpy) results and MFI properties of the agrocomposites. (**a**) Impact test, Jc; (**b**) MFI test. (0%: PPC 5660; 0%p: processed PPC 5660; 20%: CoP20 PP80; 30%: CoP30 PP70; 35%: CoP30 PP70).