Funcionalizacion de polipropileno en solucion mediante injerto de monometil itaconato

Abstract

Polypropylene (PP) was functionalized in solution by grafting with monomethyl itaconate (MMI) by using xylene and decalin as solvents and 2,5-dimethyl-2,5-bis(tert-buthylperoxy)hexane (Lup. 101 ) as radical initiator. The existence of grafted MMI in PP was confirmed by FT-IR spectroscopy. Carbonyl absorption bands from MMI was observed in the FT-IR spectrum of the functionalized polypropylene. These absorption bands are absent in the FT-IR spectrum of the unmodified polypropylene. The percentage of grafted MMI was estimated by volumetric titration as well as FT-IR analysis. The amount of monomer incorporated in polypropylene by the latter method was determined from a FT-IR calibration curve established for this monomer. A systematic study of the reaction variables allowed the optimisation of the grafting process where a maximum of nearly 0.4% of grafting was achieved when xylene was used as solvent. When decalin was used as solvent, the percentage of grafting attained was lower. It was