One-Pot Syntheses of PET-Based Plasticizer and Tetramethyl Thiuram Monosulfide (TMTS) as Vulcanization Accelerator for Rubber Production

Styrene-butadiene (SBR) and acrylonitrile-butadiene (NBR) rubber blends with tetramethyl thiuram disulfide (TMTD) monosulfide (TMTS) accelerators environmentally friendly plasticizers, obtained from PET recycling biobased resources (LA/PG/PET/EG/LA), were prepared. The mechanical properties of the products tested compared those commercial dioctyl terephthalate (DOTP). TMTS was prepared by simple efficient one-pot synthesis dimethylamine, carbon disulfide, potassium cyanide, ammonium chloride as catalysts in recycled isopropanol/water azeotrope solvent. In a comparative study, methoxide, ethoxide, iodide, amide ions also used. two-step reaction mechanism involves oxidation amine salt dimethyldithiocarbamic acid to TMTD hydrogen peroxide sulfur elimination bond. Potassium cyanide appears be most nucleophile. simplicity operation, mild conditions, solvent recycling, high yields, applicability industrial level are advantages this process. Shore hardness, tensile strength, compression test results vulcanized before after aging showed similar for both accelerators, while somewhat better LA/PG/PET/EG/LA plasticizer.