硫化蓖麻油润滑添加剂在菜籽油基础油中的摩擦学性能

在蓖麻油分子中引入硫,合成了一种新型环境友好润滑添加剂(SCO),并利用红外光谱对其主要官能团进行了表征。通过四球试验机考察了SCO在菜籽油中的抗磨性能与极压性能,用X射线光电子能谱仪对其磨痕表面元素进行分析,探讨该类添加剂的极压抗磨作用机理。结果表明,硫化蓖麻油润滑添加剂在菜籽油中具有优良的极压抗磨和减摩性能,其润滑作用机理是由于长链蓖麻油分子的载体作用、硫的高反应活性以及二者的协同作用与摩擦金属表面形成了一层高强度的吸附膜和(或)摩擦化学反应膜。

酰胺型改性蓖麻油润滑添加剂对钢-钢摩擦副和钢-铝摩擦副摩擦学性能的影响

以三乙醇胺和蓖麻油为原料,合成了一种环境友好酰胺型改性蓖麻油润滑添加剂(NCO),利用红外光谱对其主要官能团进行了鉴定。分别采用四球和SRV摩擦磨损试验机考察了以菜籽油为基础油,以NCO为添加剂时对钢-钢摩擦副和钢-铝摩擦副抗磨减摩性能的影响,采用扫描电子显微镜观察分析钢球磨斑表面的形貌,同时对铝合金磨痕进行X射线光电子能谱和电子探针分析,探讨了酰胺型改性菜蓖麻油润滑添加剂的抗磨减摩机理。结果表明,以酰胺型改性蓖麻油为添加剂,以菜籽油为基础油时,钢-钢摩擦副和钢-铝摩擦副均表现出良好的抗磨减摩作用,这是由于酰胺型改性蓖麻油添加剂以其具有较强极性而更容易在金属表面形成强吸附膜,同时在摩擦过程中形成了含有机氮、亚硝基或硝酸根的复杂氮化物的高强度聚合物膜。

Bio-based conductive polyurethane composites derived from renewable castor oil with enhanced self-healing ability for flexible supercapacitors

To alleviate the pressure on the petrochemical industry and address environmental concerns,the utilization of polyurethane(PU)derived from castor oil(CO)(as an ester polyol replacement of petrochemicalbased materials)has garnered significant attention in recent decades.Extending the service life of materials requires imparting self-healing properties to vegetable oil-based polymers,an aspect that has received limited attention in current studies.However,low self-healing efficiency still poses a significant challenge,and non-conductivity also remains an obstacle in current research,crucial for their application in electronic devices.In this work,we present the first series of electrically self-healing biopolymer composites constructed by incorporating carbon nanotube(CNT)networks into crosslinked castor oil-based polyurethane(BPU)through a simple curing process.These materials address the challenges mentioned above and exhibit improved mechanical,electrical,and self-healing capabilities compared to other biobased self-healing materials.The resulting BPU/CNT composite demonstrated exceptional repeated selfhealing capacity,restoring both mechanical properties and electrical performance even after experiencing severe mechanical damage.Notably,this composite served as a conductive substrate in flexible solid-state supercapacitor(FSSC)devices.Consequently,the FSSC derived from the composite conductive substrate achieved an impressive 92.4%self-healing efficiency even after undergoing 7 cutting/healing cycles.The device remained virtually unchanged even after being bent at a 180°angle with a bending radius of 1.6 mm,indicating excellent repeatability and durability.The exceptional self-healing ability,with∼98%electrical recovery at 100℃for 70 s and 93%at 80℃after 6 min,of these composites was attributed to the synergistic interactions of the dynamic exchange reactions of disulfide bonds and dense hydrogen bonds within the BPU matrix,which provide a reversible dynamic polymer network.The healing efficiency of these dynamic bonds was evaluated by adjusting the composition ratio of the long linear chain of pTHF in hybrid polyols of the crosslinked polymer network.Overall,this work highlights a series of green,simple,and highly efficient self-healing polymer composites derived from renewable castor oil,and it establishes an essential framework for future sustainable polymer composite design.

硼氮型改性蓖麻油润滑添加剂在菜籽油基础油和水中的摩擦学性能

在蓖麻油(CO)中引入硼、氮,合成了新型润滑油添加剂——硼氮型改性蓖麻油添加剂,并利用红外光谱对其主要官能团进行了鉴定。通过四球机考察了它在菜籽油和水中的抗磨性能与极压性能,结果表明:硼氮型改性蓖麻油添加剂具有明显的减摩、抗磨和极压性能。其润滑作用机理是由于长链蓖麻油分子的载体作用、硼的缺电子、氮的反应活性以及三者的协同作用在摩擦金属表面形成了一层高强度的吸附膜和/或磨擦化学反应膜。

合成润滑油多因素降解实验方法研究

以蓖麻油基润滑油为例,研究润滑油在非单一因素作用下的降解实验方法。在润滑油生物降解因素基础上增加非生物降解因素——光照,来模拟润滑油在自然环境中的真实降解情况,建立非单一降解因素联合作用下润滑油的室内降解实验方法,运用红外光谱法检测润滑油降解后残余含量,确定润滑油降解率。结果表明:新方案得到的实验数据具有较好的稳定性和重复性,且与文献结果具有较好的一致性;新实验方案可以得到润滑油的光降解率,虽然光降解率相对较低,但光对润滑油的降解作用不能忽略。

硼化蓖麻油润滑添加剂对钢-钢和钢-镁摩擦副摩擦学性能的影响

在蓖麻油(CO)分子中引入硼,制备了一种新型环境友好润滑添加剂(BCO),并利用红外光谱对其主要官能团进行表征。通过四球和SRV摩擦磨损试验机考察了以菜籽油为基础油、以BCO为添加剂时对钢-钢摩擦副和钢-镁摩擦副抗磨减摩性能的影响;用扫描电子显微镜观察分析钢球磨斑表面的形貌,同时通过对镁合金磨痕进行X射线光电子能谱分析,探讨了BCO添加剂的抗磨减摩机理。结果表明,BCO添加剂在菜籽油中具有优良的极压抗磨和减摩性能;其润滑作用机理是由于长链蓖麻油分子的载体作用、硼的缺电子性以及二者的协同作用与摩擦金属表面形成了一层高强度的吸附膜和/或摩擦化学反应膜。