The main goal of this project is the preparation, characterization and development of new materials based on modified sepiolite and thermoplastic and thermostable polymers. The strategies leading to the introduction on the surface of the sepiolite of a series of different molecules will be investigated, bearing in mind the disgregation of the clay during this modification stage. The most adequate among the organoclays will be incorporated to polymeric matrixes, from apolar thermoplastics like polyolefins, to polymethacrylates and thermostable polymer