Impact of the In Situ Creation of an Epoxy Based Thermosetting Minor Phase on the Physical Properties of a PP Based Blend
journal contributionposted on 09.04.2021, 19:36 by Luísa Barroso Gago, Mathilde Auclerc, Karim Delage, Nicolas Garois, Philippe Cassagnau, Véronique Bounor-Legaré
As an alternative to inorganic fillers based composites which present high density, an epoxy based thermosetting (TS) phase was in situ created in a polypropylene (PP) matrix and compatibilized by a polypropylene grafted maleic anhydride (PP-g-MA). The aim of this study is to scrutinize the chemistry and establish a relation between the morphology, the mechanical properties, and the crystalline structure of this thermosetting/thermoplastic system. Depending on the concentration of the components, a dispersed phase of around 0.5 μm diameter (even with smaller nodules) is created with the presence of PP-g-MA. Moreover, an increase of up to 24% of the Young’s modulus of the system is observed and the resilience is maintained. The evolution of the PP crystallinity by wide angle X-ray scattering analysis (WAXS) evidenced that TS is a β nucleating agent at the origin of an excellent toughness and impact strength.