Antagonistic effects of hindered piperidines and organic sulphides in photostabilization of cis-1,4-polybutadiene

The photostabilizing properties of the mixtures of organic sulphides (2,2′-thiobis(4-methyl-6-tert-butylphenol); bis-(4-hydroxyphenylene) sulphide; thio-oligomer of hydroxyphenylene sulphide; bis [β-(3,5-di-tert-butyl-4-hydroxybenzyl)-methylcarboxyethyl] sulphide; dilaurylthiodipropionate) and hindered piperidines (bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate; 4-hydroxy-2,2,6,6-tetramethylpiperidino-1-oxy; 2,2,6,6-tetramethylpiperidine) in photostabilization of cis-1,4-polybutadiene have been studied by using IR, ESR and TLC methods. A mechanism for antagonistic effects between these two types of stabilizers has been proposed.