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中文摘要：
（续上期） 2．5复合材料的老化性能 在热氧条件下，橡胶大分子链断裂致使分子链变短，材料密度增大，宏观上表现为橡胶硬度提高、物理性能下降，即橡胶材料发生了老化。NR的分子链中含有大量不饱和双键，易受到氧及臭氧的侵蚀而破坏，其热氧老化性能有待提高。
英文摘要：
In this study, nanocrystalline cellulose （NCC） was applied in NR by replacing part of the carbon black （CB）, and the influence on the curing characteristics, aging properties and thermal stability of the NR was investigated.With the addition of NCC, the CB filler network was weakened in the NR/NCC/CB composites, t10 extended, t90 shortened, and the maximum torque decreased. With the increase of addition level of NCC and elevation of curing temperature, the curing rate constant increased. With 10phr of NCC to replace equal weight of CB, the activation energy of vulcanization decreased, and the thermal stability and heat aging property were good. When the addition level of NCC increased, the temperature when the composites had 5% mass loss decreased, the maximum mass loss rate increased slightly, the temperature when the composites reached maximum mass loss changed little, and the apparent crosslink density decreased. Moreover, by adding the adhesive RH, the apparent crosslink density of the composites increased.
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