Novel lypohydrophilic porous fillers that can function as micro-reservoirs to store lubricating oil as a low-friction and anticorrosive agent in a composite coating were developed. The novel oily particles were added to an epoxy resin (EP)-based coating to study the effect of lubricating oil on the anti-corrosion and the low-friction performance of the coating. The electrochemical impedance spectroscopy and the sliding wear tests demonstrated that the oily particles can significantly improve the barrier property and the wear-resisting performance of the EP coating. Furthermore, the friction coefficient of epoxy resin-25% lubricating celatom coating (0.4) was lower than that of the epoxy resin-25% PVDF coating (0.55), and the wear rate was lower by a factor of eight. The enhanced wear resistance can be mainly attributed to the lubrication performance of the lubricating oil stored in the porous particles. In addition, the hydroxyl group on the porous particles enhanced the crosslinking with the epoxy resin.
Haokun Yi,Shuxing Mei,Heming Shen,Rong Zhang,Zhuo Li
Incorporating inorganic fillers is a common strategy for reducing the coefficient of thermal expansion (CTE) in polymers, but it is often associated with limited efficiency and a sacrifice in mechanical compliance. Current approaches mainly involve surface modification of fillers to overcome these challenges, but a significant proportion of fillers remain underutilized. In this study, we introduced hollow porous SiO 2 particles as fillers, utilizing both their external and internal surfaces to interact with the matrix. Moreover, the hollow porous structure allows the matrix to penetrate into the filler cavities, creating a unique mechanical interlock with the matrix. These combined effects result in a higher efficiency for CTE reduction and a significant improvement in the glass transition temperature. Furthermore, the hollow structure reduces the modulus of the fillers, resulting in a lower composite modulus compared to solid SiO 2 counterparts. This approach offers a new avenue for enhancing the thermal mechanical properties of polymer composites.
Polymer electrolytes usually suffer from low ionic conductivity and poor stability against the lithium electrode. Taking advantage of nanostructured metal–organic frameworks (MOFs), novel nanoporous fillers, i.e., UIO/Li-IL, are developed for polymer electrolytes; in UIO/Li-IL, a Li-containing ionic liquid (Li-IL) is absorbed in UIO-66 MOFs. These fillers are multifunctional: high ionic conductivity and capability to suppress the crystallinity and to improve the stability of polyethylene oxide (PEO) against the lithium electrode. PEO-n-UIO composite polymer electrolytes are formed by dispersing the multifunctional fillers in PEO; the conductivity of the PEO-n-UIO solid electrolytes is increased by a factor of ∼37 to 1.3 × 10−4 S cm−1 at 30 °C with 40% UIO/Li-IL, and the current density for stable Li plating/stripping in PEO-n-UIO solid electrolytes is enhanced to 500 μA cm−2 at 60 °C. Solid-state lithium batteries based on the PEO-n-UIO solid electrolyte show an initial discharge capacity of ∼151 mA h g−1 with a capacity retention of 95% after 100 cycles at 0.5C and 60 °C. Our work pioneers novel multifunctional fillers to boost the performances of composite polymer electrolytes for high energy density, safe and long lifetime energy storage systems.
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