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3397957 
Journal Article 
Reduction of antidegradants in vulcanized rubber; Quantitative analysis by gas chromatography and its effect on crack resistance 
Nam, SH; Han, MH 
1998 
6 
4 
281-286 
English 
WOS:000077344200001 
Gas chromatography was successfully used to quantitatively determine the amount of antidegradants: 6PPD (N-1,3-dimethylbutyl-N′-phenyl-p-phenylendiamine) and TMDQ (2,2,4-trimethyl-1,2-dihydroquinoline) in a vulcanized rubber. Reduction of the antidegradants in rubber by dynamic and static aging, fatigue aging, and heat aging was observed. Various effects such as aging time and temperature on the reduction of the antidegradants were also investigated. The decrease in the residual antidegradant was larger under dynamic condition than static aging, and the reduction of antidegradant increased with increasing aging time and temperature. 6PPD showed relatively fast reduction than TMDQ. Among many factors affecting the reduction of antidegradants, heat was probably the most important factor to determine the decrease in antidegradants. In terms of ozone crack resistance, the rubber compound in which the antidegradants had been reduced was far less efficient than that with the optimum antidegradant. After the dynamic and static aging, fatigue aging, and heat aging of rubber, the changed amounts of the two antidegradants in vulcanized rubber were measured by gas chromatography.