Heavy crude oil asphaltenes as a nanofiller for epoxy resinстатья
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Scopus
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Дата последнего поиска статьи во внешних источниках: 13 мая 2020 г.
Аннотация:Asphaltenes are harmful components of heavy crude oils and require rational
utilization after oil refining or deasphalting. Asphaltenes are macromolecules
containing various functional groups that self-assemble to nanoscale aggregates
and can be used as nanofillers for polymers. In this research, mixtures of
asphaltenes with the diglycidyl ether of bisphenol A were considered. The solubility
of asphaltenes in this epoxy resin, the rheological properties of the mixtures,
and the effect of asphaltenes on the curing with 4,40-diaminodiphenyl
sulfone were studied. In addition, the glass transition temperature, strength,
and adhesion characteristics of the asphaltene-filled cured composites were
evaluated. The dual role of asphaltenes in polymer modification was demonstrated:
the asphaltenes simultaneously plasticize and reinforce the polymer
matrix, and the transition from predominant plasticization to strengthening
occurs with an asphaltene content at 20 wt%. The dual reinforcement/plasticization
effect occurs because epoxy composites contain both nanosized and
microsized particles of asphaltenes due to the partial dissolution of asphaltenes
in the epoxy resin and the decrease in their solubility during high-temperature
curing.