Mechanical Properties Of Poly(Urethane-Isocyanurate) Nanocomposites As a Function Of Processing Routes

JOSE MARIA KENNY; LUIGI TORRE; ANALIA VAZQUEZ; LEONEL MATIAS CHIACCHIARELLI

Simposio; XI Simposio Argentino de Polímeros - SAP 2015; 2015

A systematic investigation of four processing routes was implemented so as to evaluate the thermal and mechanical properties of nanosilica (NS) reinforced poly(urethane-isocyanurate) (PUI) nanocomposites (NC). The NS dispersion in the Polmix and the Isomix routes was performed in the polyol and the isocyanate precursor, respectively. The Isopol and the Solvmix routes consisted on the dispersion of the filler after the mixing of the precursors and with the aid of solvents, respectively. The NS dispersion, fractography (SEM, TEM) and flexural mechanical properties was evaluated as a function of processing route and NS concentration. Each route produced a NC with distinct properties which were correlated to the NS agglomeration degree and how the NS affected the thermal transitions of the HS and the relative ratio of urethane and isocyanurate chemical groups. For example, the NC prepared with the Polmix route had substantial improvements of st and Et of around +40% and +52%, respectively and an improved thermal resistance of the Hard Segments (HS).