Fabrication And Tribological Properties Of Self-assembled Films Of Fluorosilicone Polyurethane Macromonomer

With the development of manufacturing technology, Micro-Electromechanical System asan emerging discipline has achieved rapid development in the field of aerospace machinerymanufacturing, and information dissemination. MEMS have developed along with thedevelopment of the semiconductor. It is the integration of microelectronic technology andprecision machining technology, with the characteristics of miniaturization, integration, massproduction, multidisciplinary. Because of the small size, MEMS friction is different from thetraditional mechanical. Adhesion and surface tension affect the friction and stability ofMEMS. Surface modification is an important means to solve the micro-friction of MEMS.Polyurethane material because of it’s good mechanical properties, high adhesion strength,resistance, low temperature curing, anti-friction, et al. Fluorinated silicon polyurethane with alow surface energy characteristic, so has a wide range of applications in friction andlubrication. In this paper, macro monomer has synthesis by polyethylene adipate glycol, TDI,alcohol fluoride, silane coupling agent. Using macromolecular self-assembly method toprepare fluorinated silicon polyurethane films on glass panels, and to study the frictional ofself-assembled film.With phosphoric acid as a catalyst, polyethylene glycol adipate (PEA) was obtainedthrough a two step process of esterification and polycondensation at high temperatures.Explore the reaction conditions in-depth inquiry. The results show that: product as a whitewaxy solid, Av=2.9mgNaOH/g, Qv=44.1mgNaOH/g, Mn=1700.Fluorinated polyurethane prepolymer (FPUOH) was synthesized using2,4-toluylenediisocyanate (TDI), PEA, fluoride monohydric alcohol (F-OH). Using macromolecularself-assembly method to prepare fluorine-containing polyurethane films on glass panels. Thestructures and the self-assembly fluorocarbon films of the result polymers were characterizedby FT-IR and AMF et al. The hydrophilic expertment proved the success of self-assembledfilm preparation. The tribological experiment showed that the self-assembled films have verylow friction coefficient (about0.09) and good anti-wear properties under modest loads (400mN). The improved tribological properties of the modified substrate were attributed to goodadherence of FPUOH self-assembled films on the substrate and synergy of FPUOH matrix.Fluorinated silicon polyurethane prepolymer (FPUSi) was synthesized using FPUOHand isocyanatopropyltriethoxysilane (Si-NCO). Using macromolecular self-assembly method to prepare fluorinated silicon polyurethane films on glass panels. The structures and theself-assembly films of the result polymers were characterized by FT-IR and AMF et al. Thehydrophilic expertment proved the success of self-assembled film preparation. Thetribological experiment showed that the self-assembled films have very low frictioncoefficient (about0.08) and good anti-wear properties under modest loads (400mN). Theimproved tribological properties of the modified substrate were attributed to good adherenceof FPUSi self-assembled films on the substrate and synergy of FPUSi matrix.