Abstract
The oligomers of sulfur-containing aldehyde (SA) such as cyclic trimers and Tischchenko-esters were added to non-vulcanized rubbers (polypropylene oxide, NR and SBR), and the thermal stabilization effect was studied with TGA and DTA. The stabilization effect was evaluated by measurement of the extent of shift to high temperature side of temperature starting weight loss on TGA-thermogram and the temperature starting strong exothermic phenomenon on DTA-thermogram. When the SA-oligomers were added to rubbers, in all cases the extent of shift was larger than that of control samples. The Fact Seems to Indicate that SA-oligomers retarded the thermal oxidative degradation of rubbers. Commercial sulfur-containing stabilizer, dilauryl thiodipropionate (DLTP), also showed a similar shift. In this case the extent of shift was smaller than or equivalent to that of SA-oligomers. Any regular relationship between the chemical structure of SA-oligomers and the extent of shift could not be found from above experiments.
