Thermal oxidative ageing of epoxidised natural rubber
1986
Abu Bin Amu | Abdul Rahman Bin Rais | Sidek Bin Dulngali (Institut Penyelidikan Getah Malaysia, Kuala Lumpur)
Retention in tensile property of epoxidised natural rubber (ENR) vulcanisate obtained after being subjected to thermal oxidative ageing was determined by the net result of the softening and hardening effects. These softening and hardening phenomena occurred during the ageing process. Three types of fillers, namely HAF black, local clay and silica were investigated to observe the differences in the extent of hardening imparted by these fillers after ageing for three days at 100 degrees C. Of the three fillers investigated, silica-filled ENR-50 vulcanisates gave the highest extent of hardening compared to those of HAF black and local clay. Retention in tensile strength of above 90% could be obtained from vulcanisates with three different reinforcing systems. The investigation on the effectiveness of antioxidants in retaining the tensile strength of ENR-50 after ageing at 125 degrees C was confined to five amine and phenolic antioxidants. The effectiveness of these antioxidants in retaining the tensile strength was deduced as follows: Santoflex 13 IPPD Permanax TQ Permanax1859WSL Vulkanox KB. The most effective antioxidant, Santoflex 13, required a low concentration in order to give maximum retention in tensile strength and this could be an advantage in terms of reducing compound c
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