Friction- and Wear-Reducing Properties of Multifunctional Small Molecules.

Area of Science:

• Tribology and Lubrication Science
• Materials Chemistry
• Organic Synthesis

Background:

• Traditional lubricants often require multiple additives to achieve desired performance characteristics.
• Developing multifunctional base oils can simplify lubricant formulations and potentially enhance performance.
• Existing base oils and additives have limitations in viscosity, friction reduction, and wear protection.

Purpose of the Study:

• To design and synthesize novel nitrogen- and oxygen-containing compounds as multifunctional base oils (MFBOs).
• To evaluate the rheological, friction, and wear performance of these synthesized compounds.
• To demonstrate the potential of a single molecule to combine base oil, viscosity modifier, and antiwear/friction-reducing additive functionalities.

Main Methods:

• Empirical design and one-step synthesis of nitrogen- and oxygen-containing compounds from commercial starting materials.
• Rheological evaluation, including viscosity and viscosity index (VI) measurements.
• Tribological testing to assess friction coefficients and wear performance against established benchmarks.

Main Results:

• Two synthesized compounds exhibited high viscosity indexes (VIs > 200) without polymeric viscosity modifiers.
• All evaluated MFBOs demonstrated lower coefficients of friction compared to benchmarks.
• Significant wear improvement was observed, ranging from 5.5 to 70 times better than benchmarks, attributed to polar interactions promoting boundary lubrication.

Conclusions:

• Novel nitrogen- and oxygen-containing compounds effectively function as multifunctional base oils (MFBOs).
• These MFBOs offer superior viscosity, friction reduction, and wear protection compared to conventional benchmarks.
• The study successfully demonstrates the feasibility of creating single-molecule lubricants with combined base oil, viscosity modification, and antiwear properties.