Structural, thermal, rheological, morphological and mechanical properties of polypropylene functionalized in molten state with maleinized hyperbranched polyol polyester

Abstract

In a previous study, we realized the functionalization of polypropylene (PP) with maleinized hyperbranched polyol polyester (MHBP) by using dicumyl peroxide (DCP) as an initiator for obtaining the PP-g-MHBPs. This process was carried out in solution (it is not environmentally friendly). Therefore, in the present work was realized the synthesis in a molten state (free of organic solvent). The acid value (AV) of the PP-g-MHBP was lower than that of the MHBP and this increased with the proportions of DCP and MHBP employed. The presence of the characteristic signals of the MHBP in the infrared (IR) spectra of the PP-g-MHBPs allowed evidencing the functionalization of PP with MHBP. The higher functionalization degree (FD) presented by the samples was 9.10 wt%. Furthermore, all contact angles of the PP-g-MHBP were lower than that of the PP and inferior to 90°. The viscosity (η) values of the PP-g-MHBPs was lower than that of the PP. The Young’s modulus, the ultimate tensile strength and, the elongation at break of the PP-g-MHBPs were independent of the FD and DCP content.