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Nowadays, the production of consumer goods is based on the use of non-renewable raw materials, which in recent years has been performing as a problem for the environment. Considering the large number of available bio fibers in nature, their use in the development of polymeric composites has inevitably emerged, it is also necessary to take into account the countless discarded plastics that still have the potential to be reused. In this work, fibers were extracted from pineapple crown residues and utilized to compose sustainable composites using recycled polypropylene from cups discarded in the trash as a matrix. However, it is known that for good performance, it is necessary to achieve a good chemical interaction between the fiber and the matrix. In order to improve this interaction, alkaline mercerization treatment was carried out on the surface of the fibers removing some components incompatible with the …