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Alkylboronic acid esterified cellulose nanocrystal by an improved green method as an efficient lubricant nanoadditive for friction and wear reduction
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2024-07-10 , DOI: 10.1016/j.cej.2024.153912
Yutao Cai , Yuan Meng , Yu Cheng , Minghang Guan , Xiubo Liu

To develop novel cellulose nanocrystal (CNC)-derived materials and improve its poor tribochemical reactivity, an alkylboronic acid esterified cellulose nanocrystal (AEC) was successfully prepared by an improved green esterification method. The as-prepared AEC was characterized comprehensively. It was found that AEC was of a high crystallinity index of ca. 80 % and had a needle-like morphology with length of 200 ∼ 400 nm and diameter of 10 ∼ 20 nm, comparable to those of native CNC. The esterification to prepare AEC was a surface-only process. The AEC prepared at 80 ℃ for 5 h (i. e., AEC-5-80) had the highest degree of substitution (0.20). AEC-5-80 was monodisperse in castor oil and further used as a lubricant nanoadditive. The tribological performances of AEC-5-80 were evaluated by a reciprocating ball-on-plate tribometer. The experimental results found that AEC-5-80 with a concentration of 2 wt% led to the reduction of the friction coefficient and the wear volume by 23.7 % and 59.2 % at 6 N and 8 Hz in a 2-hour experiment, more efficient than native CNC. The worn surfaces and the wear residues obtained after the tribological experiments were further analyzed. It was revealed that the adsorption film was generated on the mating surface by AEC-5-80 together with castor oil molecules and the tribochemical transfer film was also produced by iron borides along with iron oxides, which thus explained the lubrication mechanism.

中文翻译:


通过改进的绿色方法将烷基硼酸酯化纤维素纳米晶体作为有效减少摩擦和磨损的润滑剂纳米添加剂



为了开发新型纤维素纳米晶(CNC)衍生材料并改善其较差的摩擦化学反应性,通过改进的绿色酯化方法成功制备了烷基硼酸酯化的纤维素纳米晶(AEC)。对所制备的 AEC 进行了全面的表征。结果发现,AEC 具有约 100% 的高结晶度指数。 80 %,具有针状形态,长度为 200 ∼ 400 nm,直径为 10 ∼ 20 nm,与原生 CNC 相当。制备 AEC 的酯化是仅表面过程。 80 ℃ 5 h制备的AEC(即AEC-5-80)取代度最高(0.20)。 AEC-5-80 在蓖麻油中单分散,可进一步用作润滑剂纳米添加剂。 AEC-5-80 的摩擦学性能通过往复式球板摩擦试验机进行评估。实验结果发现,在2小时的实验中,浓度为2 wt%的AEC-5-80导致摩擦系数和磨损量在6 N和8 Hz下降低了23.7%和59.2%,效率更高比原生数控。进一步分析摩擦学实验后获得的磨损表面和磨损残留物。结果表明,AEC-5-80 与蓖麻油分子一起在配合表面上生成吸附膜,硼化铁与氧化铁一起生成摩擦化学转移膜,从而解释了润滑机理。
更新日期:2024-07-10
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