| 초록 |
The adhesion between a p-hydroxy benzoic acid (POB) incorporated rubber compound and a brass-plated steel cord was investigated to understand the role of POB as an adhesion promoter. Cure rate slowed when POB was added to the rubber compound, but changes in the physical properties were not significant. An improvement in adhesion was seen with the low loading of POB at the range of 0.5 - 1 phr, while an adverse effect was observed only with high loading at 4 phr and a long aging time of 15 days. The addition of POB for the enhancement of adhesion property had a great effect before and/or after aging. However, higher POB loading as well as longer aging time leads to a large increase in copper migration into the rubber and the excessive growth of the zinc oxide layer, resulting in decreased adhesion property. The adhesion interphase before aging, between a thin brass film and a rubber compound studied using AES, showed no difference except that sulfur levels increased with the increase of POB loading.On the other hand, the adhesion interphase changes after humidity aging, showed a decrease in copper content at the adhesion interphase while it increased in the rubber layer when POB loading was increased
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