English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Polysulfone (PSF)/silica hybrid double-wall microcapsules containing lubricant are synthesized. The lubricant-loaded PSF microcapsules are prepared by a simple solvent evaporation method, and the surface of the PSF microcapsules are modified and activated by dopamine. The activated PSF microcapsules are then microencapsulated again by a silica wall using a sol–gel method. The mean diameter and wall thickness of the synthesized double-wall microcapsules are approximately 90 and 6 μm, respectively. High thermal stability of the microcapsules with a thermal degradation onset temperature of 300 °C is obtained. The microcapsules are able to withstand the high-temperature shaping conditions necessary for the polypropylene (PP) composites system used (260 °C for 60 min). The silica walls effectively protect the PSF microcapsules from softening transformation. Tribology testing of PP self-lubricating composites incorporating 10 wt% lubricant-loaded microcapsules yields 54.9% and 54.3% reductions in the coefficient friction and wear rate under middle load and middle sliding speed conditions, respectively, compared to the pure PP. The tribological behavior of the self-lubricating PP is further assessed under different applied loads and sliding speed combinations. The formation of a boundary lubricating film from releasing lubricant and the entrapment of wear debris in the cavities left by the ruptured microcapsules are the major self-lubricating mechanisms. These PSF/silica hybrids double-wall microcapsules can be applied to many other polymers to produce unique self-lubricating materials.

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