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In recent years, due to less environmental pollution, ecological products are recommended more and more by the different environmental unions and cooperation. To achieve this, industries have studied the use of composite materials based on natural resources because of their lightness, their resistance to corrosion, their biodegradability, and their wide availability. In the same context, the current work may open up a new way of developing an original biocomposite material by taking advantage of integrating Olive Pomace Powder (OPP) as a filler on the PA6 matrix. This technical polymer is one of the most widely used polymers thanks to its chemical and physical stability, thermal resistance, low cost, and availability.The dry OPP is used without any additional chemical treatment; it had particle sizes (160–250 μm). The PA6/OPP was prepared thanks to polymerization in situ, a new innovative way to fabricate our biocomposite. The rate of OPP varies from 5% to 20% by weight. The structural, physicochemical, and thermal behavior was determined using FTIR, XRD, DSC, and TGA-DTA techniques. The morphology of the samples was analyzed with the SEM technique. The results show that the addition of OPP does not diminish the properties of PA6 till a ratio of 20% by weight. The density and the crystallinity of PA6/OPP were almost unchangeable than PA6. It was also found that after adding 20% OPP, the crystalization temperature Tc and melting temperature Tm were the same as PA6, while the decomposition temperature Td increases slightly. These results show that this incorporation can be a way to valorize the OPP and on the other hand reduce the cost of the final product fabricating with the PA6 matrix.

Polyamide 6 (PA6, polycaprolactam, Nylon 6) is a thermoplastic polymer widely used in construction, automotive, packaging, etc. It is a semi-crystalline polymer known for its good mechanical properties, and chemical, and thermal stability, with a low price, compared to the other polyamides. PA6 can be synthesized by anionic polymerization of ε-caprolactam, initiated by sodium hydride, and activated by N-acetylcaprolactam. This poorly biodegradable material has quickly proven to be a source of considerable pollution both visually and in terms of ecosystem preservation, particularly due to its increasing annual global production. This issue raises the need to develop environmentally friendly protocols for the degradation of this waste. One of the methods that can prove to be effective is the degradation by microorganisms. The objective of our research is to study the degradation of PA6 by the bacteria Lysinibacillus sp. (LB), Alcaligene faecalis (AF), and Enterococcus faecalis (EF) isolated from the landfill. The three bacteria, isolated and previously identified, were able to show proliferation in minimal media using PA6 as the sole source of carbon and nitrogen. The weight loss of the PA6 pellets was evaluated at 21% for L. bacillus, 27% for A. faecalis, and 13% for E. faecalis after 48 days of incubation. The biodegradation of PA6 was also confirmed by FTIR and SEM coupled to the elemental detector scanning EDS, which revealed the structural, morphological, and elemental changes that PA6 underwent.