Thermal Oxidative Aging Behavior of Natural Latex Sponge under Different Temperature Conditions
In order to analysis the effect of temperature on thermal oxidative aging behavior of latex sponge.The morphology and structural changes of latex sponge after aging directly affect its product use value,and its aging behavior is closely related to temperature.This study is not limited to mechanical properties.By measuring the changes of whiteness index,yellowness index,crosslink density,and indentation hardness of latex sponge at 70 ℃ and 120 ℃,the thermal oxidative aging behavior of materials under different temperature conditions was analyzed.The experimental results show that the peak of the yellowness index is reached at 86 hours at 120 ℃,the pore structure disappears and residue powder is formed on the surface.The crosslinking density is initially increased first and subsequently decreased,and the indentation hardness is sharply increased in a short time.Under the condition of 70 ℃i,a slow decrease in the whiteness index of the material is noted.The other indexes display a slow upward trend,and the complete pore structure is retained.It is concluded that the change procedure and final shape of the latex sponge morphology and structure during the aging process under the condition of 120 ℃ are significantly different from those under the relatively low temperature condition.The product value is rapidly lost due to thermal oxidative aging behavior,and the thermal oxygen aging resistance of 80NR latex sponge needs improvement.
latex spongethermal oxidative agingcrosslinking densityindentation hardnessyellowness index
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