Abstract
A method for the simultaneous identification of 24 accelerators and 19 antioxidants in vulcanized rubbers by one- and two-dimensional thin layer hromatogcraphy was presented. Sample was spotted on a thin layer of silica gel containing 5% calcined gypsum, and was developed with chloroform-benzene (10 : 9) in one direction and then with ethanol in the other. After drying in the air, the thin layer was treated by spraying with formalin-sulfuric acid (1 : 4) and then heated at 120°C for 1 hour. All of the above rubber chemicals, preliminarily extracted with chloroform, acetone and methanol from rubbers, were identified successfully by the Rf values and colors of spots and were distinguished from base rubbers partly extracted with the same solvent.
