Chemistry of Interfaces, Luleå University of Technology, S-97187, Luleå, Sweden.
Phys Chem Chem Phys. 2011 Jul 28;13(28):12865-73. doi: 10.1039/c1cp21139k. Epub 2011 Jun 20.
We report on the synthesis, characterisation, and physical and tribological properties of halogen-free ionic liquids based on various chelated orthoborate anions with different phosphonium cations, both without halogen atoms in their structure. Important physical properties of the ILs including glass transition temperatures, density, viscosity and ionic conductivity were measured and are reported here. All of these new halogen-free orthoborate ionic liquids (hf-BILs) are hydrophobic and hydrolytically stable liquids at room temperature. As lubricants, these hf-BILs exhibit considerably better antiwear and friction reducing properties under boundary lubrication conditions for steel-aluminium contacts as compared with fully formulated (15W-50 grade) engine oil. Being halogen free these hf-BILs offer a more environmentally benign alternative to ILs being currently developed for lubricant applications.
我们报告了基于各种螯合硼酸根阴离子与不同鏻阳离子的卤代自由离子液体的合成、表征以及物理和摩擦学性能，这些离子液体的结构中均不含卤素原子。我们测量并报告了这些离子液体的重要物理性质，包括玻璃化转变温度、密度、粘度和离子电导率。所有这些新型卤代自由硼酸酯离子液体（hf-BILs）都是在室温下疏水且水解稳定的液体。作为润滑剂，与全配方（15W-50 级）发动机油相比，这些 hf-BILs 在钢-铝接触的边界润滑条件下表现出相当优异的抗磨和减摩性能。由于不含卤素，这些 hf-BILs 为目前正在开发用于润滑剂应用的离子液体提供了一种更环保的替代品。
