Structure and thermal stability of cellulose nanocrystal/polysulfone nanocomposites

•Thermal stability of cellulose nanocrystal (CNC)/polysulfone nanocomposites was studied.•Effect of heating rate and CNC content was evaluated.•Master decomposition curves were developed to estimate thermal stability.•Stabilizing effect of PSf matrix suppressed CNC filler thermal degradation.•Thermal degradation of nanocomposites followed 1st or 2nd order reaction kinetics.