A Previous well-known technique is TG/DTg but the fibers decompose with the rubber on raising the temperature so it won't work what else characterization technique we can use for this particular.
You should specify what you mean for the "grafting". Do you refer to a chemical interaction between "fibers and polymer chains" or one between "fiber and other components"? It is generally determined with spectroscopic or chemical analysis techniques rather than thermoanalytical methods.