Additives are chemical compounds added to polymer matrices, in relatively low concentrations, except for some as fillers/reinforcements or plasticizers. Without additives, polymers would have virtually no properties for use, and often too little resistance over time. Additives play a crucial role in the behavior of materials in terms of appearance and properties . They can also influence durability, stability, UV resistance, fire resistance... Additives can be classified into 4 distinct categories : (i) functional additives (antioxidants, plasticizers, anti-UV…), (ii) colorants, (iii) fillers and (iv) reinforcements. Several literature reviews have already been published in this field , which shows that the choice of an additive is based on numerous criteria, such as the nature and structure of the macromolecules. The additive must be compatible and dispersible into the matrix.