Preparation and application of polysulfone microcapsules containing tung oil in self-healing and self-lubricating epoxy coating

Abstract

：Polysulfone microcapsules containing tung oil were synthesized by a solvent evaporation method. The mean diameter and wall thickness of the synthesized microcapsules were approximately 130 μm and 9 μm, respectively. High thermal stability of the microcapsules with a thermal degradation onset temperature of 350°C was obtained. The multi-functional coating was fabricated by incorporating the microcapsules containing tung oil into an epoxy matrix. The self-healing and self-lubricating functions were evaluated by corrosion and tribology test. 10 wt% microcapsules embedded in epoxy coating offered optimum results. The microcapsules showed excellent anticorrosion performance in scratched coatings, which was attributed to the formation of a cross-linked polymer film after tung oil was released from the damaged microcapsules. The frictional coefficient and wear rate of the self-lubricating coating decreased significantly as compared to the neat epoxy. The formation of a transfer film from releasing tung oil and the entrapment of wear particles in the cavities left by the ruptured microcapsules were the major antifriction mechanism.

Tribological behavior of polymer composites containing microcapsules and fibrous fillers: Finite element analysis and experimental verification

“…With the rupture of the shell materials during the sliding process, the lubricant in MCs flows to the contact surface and forms an oil film, reducing the friction coefficient of composites from 0.46 to 0.35 in the previous research . Compared to most polymers, the higher thermal conductivity of CFs (84.35 W/m°C) can effectively improve the heat dissipation rate of composites during the sliding process .…”

Synthesis of Core–Shell Micro/Nanoparticles and Their Tribological Application: A Review

“…In general, there are two ways for core–shell particles to improve the tribological properties of the matrix: in the form of micro/nanocapsules and core–shell particles with solid cores. The commonly used method is micro/nanocapsules [ 55 , 56 , 57 , 58 , 59 , 60 , 61 ]. The core–shell particles with solid cores to improve the tribological properties of solid matrix are less reported at present relatively.…”

“…This could be attributed to the formation of a smooth layer between the friction pairs. Li et al [ 57 , 58 , 59 ] conducted a series of studies on microcapsules/epoxy resin composites and greatly improved the lubricating properties of the composite materials because of the newly formed oil film between the epoxy and sliding surface. What is more, they found that the wear debris of shells could act as liquid additives in the oil to improve the wear resistance of the composites.…”

High temperature resistant polysulfone/silica double-wall microcapsules and their application in self-lubricating polypropylene

“…Recently, we have demonstrated the encapsulation of a lubricant, ionic liquid and tung oil by solvent evaporation method. 18,25,26 Polysulfone (PSF) was used as the wall material of microcapsules and the synthesized microcapsules were applied in an epoxy resin to prepare self-lubricating and self-healing materials. PSF has high chemical and physical stability, excellent mechanical properties and thermal stability (its thermal decomposition temperature is 490-510 C).…”