DJEGHIOUR Maria, RAMDANEWissal, BOUIDIOUA Maroua2025-03-022025-03-022023-06-26http://dspace.univ-skikda.dz:4000/handle/123456789/4169The compatibilization of polymer blends, such as high-density polyethylene (HDPE) and polyethylene terephthalate (PET), is a process that aims to improve the compatibility and the properties of the blend. HDPE/PET exhibit poor miscibility due to differences in their chemical structure and polarity. This leads to phase separation and weak interfacial interactions between the polymers, resulting in reduced mechanical, thermal, and other properties of the blend. Compatibilization methods such as Physical and chemical compatibilization are employed to overcome these challenges and enhance the performance of polymer blends. Physical compatibilization involves incorporating a compatibilizing agent into the blend, which can effectively improve the interfacial adhesion and promote molecularlevel mixing between the polymers.enThesis