INSTITUTO DE TECNOLOGIA EN POLIMEROS Y NANOTECNOLOGIA
Unidad Ejecutora - UE
The effect of processing routes on the thermal and mechanical properties of poly(urethane-isocyanurate) nanocomposites
JOSE MARIA KENNY; L. TORRE; CHIACCHIARELLI LEONEL MATIAS
JOURNAL OF APPLIED POLYMER SCIENCE
JOHN WILEY & SONS INC
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), flexural and tensile mechanical properties, thermogravimetric analysis (TGA) and FTIR analysis of NCs was performed as a function of processing route, isocyanate index 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 t and t of around +40% and +52%, respectively and an improved thermal resistance of the Hard Segments (HS).