3.6.3. Thermal analysis
Fig. 7 and Table 9 shows the TGA thermograms and data,
respectively, of DCP/coagent and radiation/coagent cured NBR vulcanizates.
At temperature up to 500 C both vulcanizates demonstrated
similar thermal stability. It can be observed that the
decomposition temperatures are nearly comparable for both two
cured systems except at 60% decomposition (T60). The temperature
of degradation obtained for radiation/coagent cured system is
higher than that of the DCP/coagent cured system, 566.75 C and
526 C respectively. Meanwhile, both cured systems exhibited
the same decomposition temperature for 50% loss (T50) which is
fairly close to Tmax of both vulcanizates, 485 C, as shown by
the DTG curves, Fig. 8.
The slight enhancement in thermal stability of radiation/coagent
cured vulcanizates may be related to a slight increase in
cross-link density which is a factor affecting the thermal stability
that leads to higher values of activation energy needed for thermal
decomposition of vulcanizates [28,29].
3.6.3. Thermal analysisFig. 7 and Table 9 shows the TGA thermograms and data,respectively, of DCP/coagent and radiation/coagent cured NBR vulcanizates.At temperature up to 500 C both vulcanizates demonstratedsimilar thermal stability. It can be observed that thedecomposition temperatures are nearly comparable for both twocured systems except at 60% decomposition (T60). The temperatureof degradation obtained for radiation/coagent cured system ishigher than that of the DCP/coagent cured system, 566.75 C and526 C respectively. Meanwhile, both cured systems exhibitedthe same decomposition temperature for 50% loss (T50) which isfairly close to Tmax of both vulcanizates, 485 C, as shown bythe DTG curves, Fig. 8.The slight enhancement in thermal stability of radiation/coagentcured vulcanizates may be related to a slight increase incross-link density which is a factor affecting the thermal stabilitythat leads to higher values of activation energy needed for thermaldecomposition of vulcanizates [28,29].
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