32 / 42
Page 143
conferenceseries
.com
Volume 6
Research & Reviews: Journal of Material Sciences
ISSN: 2321-6212
Advanced Materials 2018
September 04-06, 2018
September 04-06, 2018 | Zürich, Switzerland
21
st
International Conference on
Advanced Materials & Nanotechnology
Thermal investigation of phase change materials based on LLDPE, paraffin wax and expanded
graphite
Mustapha Karkri
1
, Mariam A Al Maadeed
2
, Igor Kruppa
2
and
Patrik Sobolciak
2
1
Université Paris Est, France
2
Center for Advanced Materials, Qatar
P
araffin waxes which are saturated hydrocarbon mixtures, generally entailing of a mixture of different alkanes are frequently
used as phase change materials (PCMs) due to their numerous advantages such as high latent heat of fusion, negligible
super-cooling, low vapor pressure in the melt and chemical inertness. Paraffin waxes, blended with appropriate polymers to
avoid the leaching of paraffin during heating, seem to be the best way for preparation of smart PCMs for different applications
such as thermal storage of solar energy, thermal protection of electronic devices, thermal protection of food and medical
goods, passive storage in bio climatic buildings and thermal comfort in vehicles. Due to the relatively low thermal conductivity
of linear low density polyethylene (LLPDE) and also paraffin wax (approximately 0.2 W/mK) it is necessary to improve the
thermal conductivity of the PCMs by adding conductive fillers. Nowadays, expanded graphite (EG) is commonly used to
improve mechanical, electrical conductivity, thermal conductivity and other thermophysical properties. In this contribution
thermal properties of the PCMs based on LLDPE, paraffin wax RT42 (melting point around 42°C) and expanded graphite were
characterized by unique devices, namely PCGT and DICO devices, which allows an investigation of thermal properties of large
sized samples in comparison with common differential scanning calorimetry (DSC). Storage and release of thermal energy
of the PCMs have been performed by means of PCGT device. It was confirmed that all prepared PCMs were able to store
and release thermal energy. Also reproducibility of storage and release heat of the PCMs by repeating of heating and cooling
process has been demonstrated. The best results in view of time needed for storage and release energy were achieved with PCMs
containing 15 wt% of EG. Thermal conductivity and diffusivity of the PCMs have been measured by DICO device. Increase of
the EG content in the PCMs led to the increase of thermal conductivity and also thermal diffusivity for all investigated PCMs.
Mustapha.karkri@u-pec.frRes. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C3-021