科研之友
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摘要
Aging-resistance is an important property of rubber products for their long-term applications. Antioxidants are widely used in the rubber formula to prevent its oxidative aging. However, the blooming of antioxidants results in loss of aging protection and induces toxicity and pollution, which limit their amounts in the rubber. Herein, a novel strategy to avoid such a blooming and improve the aging resistance of polar acrylonitrile-butadiene rubber (NBR) composites was proposed by doping sustainable carbon nanotubes (CNTs) with antioxidants. Phenolic antioxidants, 3,9-bis-(1,1-dimethy1-2[beta-(3-tert-butyl-4-hydroxy-5-methylphenyl-)propionyloxyjethyl}-2,4,8,10-tetraoxaspiro[5,5]-undecane (AO80) were chemically grafted and then physically absorbed to CNTs, therefore CNTs with rich antioxidants (CNT-AO80) were prepared, whose total loading efficiency of AO-80 reached 10.3 wt%. In CNT-AO80, physical loading amounts of antioxidants were 3.7 wt% and strongly suppressed by those parts from chemically grafting (6.6 wt%), developing a distribution of antioxidant around CNTs. When 20 phr CNT-AO80 were added to NBR, they allowed a good dispersity and reinforcement for the composites. After naturally aging for 1 year and a 60-day thermal -oxidative test at 90 degrees C, the NBR composite with CNT-AO80 gave a low variation of mechanical property without AO-80 blooming, showing a good oxidative aging resistance. We believe that the design of loading antioxidants to CNTs may provide an effective solution to extend the service lifetimes of the rubber products.
- 出版日期2017-10
- 单位航天材料及工艺研究所; 中国科学院理化技术研究所; 北京航空航天大学; 新型陶瓷与精细工艺国家重点实验室; 清华大学
