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AuthorAbdelrazeq H.
AuthorSobolciak P.
AuthorAl-Maadeed M.A.-A.
AuthorOuederni M.
AuthorKrupa I.
Available date2020-04-16T06:56:46Z
Publication Date2019
Publication NameMolecules
ResourceScopus
ISSN14203049
URIhttp://dx.doi.org/10.3390/molecules24071217
URIhttp://hdl.handle.net/10576/14209
AbstractAn artificial aging study of novel heat absorbers based on phase change materials (PCMs) prepared from recycled high-density polyethylene (HDPE), paraffin wax (PW), and expanded graphite (EG) was investigated. The optimal composition of PCMs contained 40 wt% HDPE, whereas the paraffin wax content ranged from 40 to 60 wt% and the expanded graphite content ranged from 5 to 15 wt%. PCMs were artificially aged through exposure to UV irradiation, enhanced temperature, and humidity. It was clearly demonstrated that the addition of EG to PCMs led to the suppression of PW leakage and improved the photooxidation stability of the PCMs during the aging process. The best performance was achieved by adding 15 wt% of EG to the PCMs. The sample shows a leakage of paraffin wax below 10%, retaining a melting enthalpy of PW within PCMs of 54.8 J/g, a thermal conductivity of 1.64 W/mK and the lowest photooxidation, characterized by an increase in the concentration of carbonyl groups from all investigated materials after artificial aging. Furthermore, PCMs mixed with EG exhibited good mechanical properties, even after 100 days of exposure to artificial aging. Finally, this work demonstrates a justification for the use of recycled plastics in the formation of PCMs.
SponsorThis research was funded by an NPRP grant No: NPRP10-0205-170349 from the Qatar National Research Fund (a member of the Qatar Foundation).
Languageen
PublisherMDPI AG
SubjectArtificial aging
Expanded graphite
Leakage
Paraffin wax
Phase change materials
Thermal conductivity
TitleRecycled polyethylene/paraffin wax/expanded graphite based heat absorbers for thermal energy storage: An artificial aging study
TypeArticle
Issue Number7
Volume Number24
dc.accessType Open Access


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