【作者】 李宁；

【导师】 刘力；

【作者基本信息】 北京化工大学 ， 材料科学与工程， 2015， 硕士

【摘要】 二硫化钼(MoS2)具有特殊的层状结构,当受到外力时,层与层之间弱的范德华力很容易断裂而产生滑移,所以具有很低的摩擦系数,是一种优良的润滑剂。与普通MoS2相比,纳米MoS2具有更低的摩擦系数,减摩抗磨效果更好,由于具有纳米尺寸效应,与聚合物基体的界面结合作用也明显增强,是一种很有潜力的橡胶抗磨添加剂。第一部分：探究三种仪器(超声清洗器、超声细胞粉碎机和高速球磨机)液相剥离MoS：的最佳条件,通过扫描电子显微镜(SEM)和透射电子显微镜(TEM))对MoS2的表面形貌以及片层厚度进行表征。结果表明,三种仪器均能将微米MoS2剥离成片层较薄且部分成纳米尺度的纳米MoS2。超声清洗器、超声细胞粉碎机、高速球磨机最佳液相剥离MoS2的条件分别为：超声1h、超声8次、球磨1h。第二部分：制备MoS2/炭黑/丁腈橡胶复合材料和MoS2/炭黑/天然橡胶复合材料,研究MoS：的含量变化对复合材料性能的影响。在MoS2/炭黑/NBR复合材料中MoS2仍然保持着原有的层状结构,未经剥离的普通MoS2会降低复合材料的耐磨性能,而经过剥离的MoS2可以有效提高复合材料的耐磨性能。在MoS2/炭黑/NR复合材料中,随MoS2含量的增加,复合材料性能的变化没有规律可循,这可能与天然橡胶的结构有关。第三部分：利用乳液-共絮凝的方法,制备了MoS2/丁苯橡胶和MoS2/炭黑/丁苯橡胶纳米复合材料,研究不同MoS2含量对橡胶复合材料各项性能尤其是对耐磨性能的影响。结果表明,在两种体系中,随着MoS2含量的增加,复合材料的力学性能以及耐磨性能均有所提高,且MoS2/SBR复合材料性能提高的幅度要比MoS2/炭黑/SBR复合材料的大。第四部分：研究不同MoS2填充份数对MoS2/白炭黑/丁苯橡胶复合材料性能的影响。在白炭黑填充体系中,随着MoS2含量的增加,复合材料的力学性能有小幅度增加,而耐磨性能提高较为显著,填充10phr MOS2的复合材料的阿克隆体积磨耗量比纯白炭黑填充的复合材料降低了46%。第五部分：制备MoS2-丁吡橡胶/丁苯橡胶复合材料,在乳液-共絮凝过程中,用等量(10phr)的丁吡橡胶替代丁苯橡胶,以MoS2填充量为变量,研究丁苯橡胶复合材料各项性能与MoS：含量变化的关系。结果表明随着MoS：的增加,复合材料的力学性能有较大提高,且相同MoS2填充量的MoS2-VPR/SBR复合材料的力学性能以及耐磨性能,要比未用丁吡橡胶替代的MoS2/SBR复合材料提高很多。这是因为丁吡橡胶在体系中充当MoS2与丁苯橡胶的桥梁,可以增强MoS2与丁苯橡胶基体之间的界面结合作用,继而提高丁苯橡胶复合材料的力学性能以及耐磨性能。当MoS2填充份数为2phr时,复合材料的耐磨性能最好,阿克隆体积磨耗量为0.23cm3/1.61km。更多还原

【Abstract】 Molybdenum disulfide (MoS2) has a very special layered structure. When subjected to external forces, the weak van der Waals interactions between the sheets can be easily broken, so MoS2 is a superior lubricant with a very low friction coefficient. Compared with ordinary MoS2, nano-MoS2 has a much lower friction coefficient and much better effect of anti-wear and friction reducing. Due to nano-size effect, the interface between nano-MoS2 and rubber matrix has been enhanced, so nano-MoS2 is a promising wear-resistant filler for rubber composites.In the first part, the best experimental conditions for liquid exfoliating MoS2 using three instruments (Ultrasonic cleaner machine、 Ultrasonic cell crusher and High speed ball mill) have been studied. The surface morphology and thickness of MoS2 have been investigated by SEM and TEM. The results showed that all the three instruments can successful exfoliate MoS2 to thinner layers. The optimal time for liquid exfoliating MoS2 is one hour、8 times and one hour respectively.In the second part, we studied the influence on the properties of the MoS2/carbon black/nitrile butadiene rubber (NBR) composites and the MoS2/carbon black/natural rubber (NR) composites with different dosage of MoS2. We founded that MoS2 maintained its original layered structure in the NBR composites and the abrasion resistance property of the NBR composites filled with exfoliated MoS2 exhibits an increased trend while the composites filled with un-exfoliated MoS2 exhibits a decreased trend. The properties of the NR composites are not reinforced as the content of exfoliated MoS2 increasing. This may be related to the structure of natural rubber.In the third part, MoS2/SBR composites and MoS2/carbon black/SBR composites are prepared by a latex co-coagulation method. We studied the effect on the properties especially the abrasion resistance property of the composites with the increasing content of MoS2. The results show that the mechanical properties and abrasion resistance property of the two systems are enhanced with the increasing loading of MoS2, and the properties of the MoS2/SBR composites are enhanced more.In the fourth part, the effect of the different concent of MoS2 on the properties of the MoS2/silica/SBR composites is discussed. In the silica filled rubber system, the mechanical properties of the composites exhibit a little increased trend, but the abrasion resistance property is improved greatly. Compared with only silica filled systems, the volume loss of the composites filled with 10 phr MoS2 after Akron abrasion test is descreased by 46%.In the fifth part, MoS2-VPR/SBR composites are prepared by replacing the SBR latex with as much VPR latex in the flocculation process. The properties of the composites are investigated. The results show that, the composites possess superior mechanical properties with the increasing MoS2 laoding. With the same concent of MoS2,the mechanical and abrasion resistance properties of the MoS2-VPR/SBR composites are more outstanding than those of the MoS2/SBR composites which are not reinforced by VPR. This is because that VPR can act as a bridge which can strengthen the interface of MoS2 and SBR. The wear resistance property of the composite which is filled with 2 phr MoS2 is the best and the volume loss is as low as 0.23cm3/1.61km.更多还原