NDLI: Thermally Conductive Polyethylene/Expanded Graphite Composites as Heat Transfer Surface: Mechanical, Thermo-Physical and Surface Behavior

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Thermally Conductive Polyethylene/Expanded Graphite Composites as Heat Transfer Surface: Mechanical, Thermo-Physical and Surface Behavior

Content Provider	MDPI
Author	Patrik, Sobolčiak Abdulgader, Asma Mrlik, Miroslav Popelka, Anton Abdala, Ahmed A. Aboukhlewa, Abdelnasser A. Karkri, Mustapha Kiepfer, Hendrik Bart, Hans-Jörg Krupa, Igor
Copyright Year	2020
Description	Composites of high-density polyethylene (HDPE) and expanded graphite (EG) are prepared for heat exchangers in multi-effect distillation (MED) desalination. At 50 wt.% EG loading, the thermal conductivity of HDPE was increased by 372%. Moreover, the surface wettability of the HDPE/EG composite was enhanced by corona and RF plasma treatment as demonstrated by the increase in surface free energy from 28.5 mJ/m2 for untreated HDPE/EG to 55.5 and 54.5 mJ/m2 for HDPE/EG treated by corona and RF plasma, respectively. This enhanced surface wettability was retained over a long time with only a 9% and 18% decrease in RF and corona plasma-treated samples’ surface energy after two months. The viscoelastic moduli and the complex viscosity profiles indicated that EG content dictates the optimum processing technique. At loading below 30 wt.%, the extrusion process is preferred, while above 30 wt.% loading, injection molding is preferred. The plasma treatment also improved the HDPE/EG composite overall heat transfer coefficient with an overall heat transfer coefficient of the composite reaching about 98% that of stainless steel. Moreover, the plasma-treated composite exhibited superior resistance to crystallization fouling in both CaSO4 solution and artificial seawater compared to untreated composites and stainless-steel surfaces.
Starting Page	2863
e-ISSN	20734360
DOI	10.3390/polym12122863
Journal	Polymers
Issue Number	12
Volume Number	12
Language	English
Publisher	MDPI
Publisher Date	2020-11-30
Access Restriction	Open
Subject Keyword	Polymers Manufacturing Engineering Multi-effect Distillation High Density Polyethylene Expanded Graphite Polymeric Composites Plasma Treatment Scaling
Content Type	Text
Resource Type	Article

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