High-density polyethylene as phase-change material: Long-term stability and aging

Weingrill, Helena; Resch‐Fauster, Katharina; Lucyshyn, Thomas; Zauner, Christoph

doi:10.1016/j.polymertesting.2019.04.009

Cited by 35 publications

(30 citation statements)

References 31 publications

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“…Additionally, the FTIR spectra recorded from the specimens of the neat PE after 7214 h of exposure at 180 °C are displayed for comparison purposes (data taken from Ref. ). The FTIR spectra of the zero samples and the exposed specimens exhibited significant differences.…”

Section: Resultsmentioning

confidence: 99%

“…The HDPE Bormed HE9621‐PH (Borealis GmbH, Linz, Austria) with a density of 0.964 kg m −3 and a melt flow rate (MFR) of 12 g/10 min (2.16 kg, 190 °C) was used for compounding. The HDPE grade was chosen as it exhibited an outstanding high heat of fusion and was already tested as PCM . Also, other HDPE grades have been tested as PCM, but the selected grade possesses the lowest viscosity (as deduced from the MFRs from the material data sheets) among the tested grades.…”

Section: Methodsmentioning

confidence: 99%

“…High‐density polyethylene (HDPE) is an interesting novel phase‐change material (PCM) for thermal energy storages (TESs) . It meets three major requirements for TES materials: low‐cost, a high heat of fusion (i.e., the energy density), and an outstanding stability when exposed above its melting temperature in storage‐like conditions . However, as for other low‐temperature PCMs (e.g., paraffins, fatty acids, esters), HDPE's thermal conductivity (TC) is low and in the approximate range of 0.3–0.5 W/(mK) .…”

Section: Introductionmentioning

confidence: 99%

“…The incorporation of carbon‐based fillers [e.g., expanded graphite (EG), graphene, carbon nanotubes, carbon fibers], metal fillers (e.g., aluminum, copper, steel, zinc), and ceramic fillers (e.g., aluminum nitride, boron nitride, talc) has been extensively studied for enhancing the TC of polymers and TC enhancements of several hundreds of percent were obtained . However, two aspects have to be considered when a polymeric compound with enhanced TC is applied as PCM: As the particles interact with the surrounding matrix, not only the compound's TC is enhanced but simultaneously storage‐relevant properties such as the polymer's melting and crystallization behavior (which determine the operating temperature of the PCM), the heat of fusion (storage capacity), and the degradation behavior (thermal stability) may be affected. The polymeric compound exhibits melt movability in the charged state . Thus, the positions of the incorporated particles in the polymeric matrix are variable.…”

Section: Introductionmentioning

confidence: 99%

“…It was found that the metals lowered the polyethylenes' thermo‐oxidative stability as metal ions typically catalyze the decomposition of peroxides which promote polymer degradation due to the generation of free radicals . However, in bulky polymer PCM samples, typically thermal and thermo‐oxidative loads overlap . Thus, their stability is rather difficult to predict.…”

Section: Introductionmentioning

confidence: 99%

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Thermally conductive high‐density polyethylene as novel phase‐change material: Application‐relevant long‐term stability

Weingrill

Resch‐Fauster

Lucyshyn

et al. 2019

J of Applied Polymer Sci

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The long-term stability of thermally conductive high-density polyethylene (HDPE)-based compounds as phase-change material (PCM) is investigated. For this purpose, the HDPE's thermal conductivity (TC) is first enhanced via compounding two different filler types (expanded graphite and aluminum) into the polymeric matrix. Bulky specimens of these compounds are then stored in air for up to 7289 h in the melt state to investigate the compounds' long-term stability as PCM. Their thermo-oxidative/thermal stability and their ability to maintain the isotropic material character (homogeneous distribution of the incorporated particles) is investigated. The compounds' degradation behavior is monitored via Fourier-transform infrared spectroscopy and the maintenance of the homogeneous filler distribution is examined via a combined differential scanning calorimetry/thermogravimetric analysis mapping of each exposed specimen. The storage capacity decreases minimally after 7289 h of exposure. Furthermore, the incorporated filler particles enhance the thermo-oxidative stability of HDPE as PCM. Consequently, thermally conductive HDPE is a highly interesting PCM.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Thermally conductive high‐density polyethylene as novel phase‐change material: Application‐relevant long‐term stability

Weingrill

Resch‐Fauster

Lucyshyn

et al. 2019

J of Applied Polymer Sci

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Hybridization of Salt Hydrates with Solid–Solid Phase Change Materials: A Novel Pathway to Sorption Thermochemical Materials Manufacturing

Palacios

Navarro

Barreneche

et al. 2023

Advanced Sustainable Systems

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Major advancements are needed in the thermochemical energy storage (TCES) field to bring the technology to commercial levels. The current research strategies are focused on improving heat and mass transfer using different supporting materials to achieve mechanical integrity during storage. However, these strategies are still under development, and they have not overcome the lab scale yet. This work explores novel matrices to expand the material database for TCES composites. Pure structural matrices (cellulose) and novel matrices with storage potential (polymeric solid–solid phase change materials) are selected and combined with three well‐known thermochemical materials (TCMs) (MgSO4·6H2O, SrBr2·6H2O and MgCl2·6H2O), providing evidence of hybridized composites with storage capacity up to 2.4 GJ m−3 with a 25–20 wt% of polymeric matrix. The polymer content is found to act as a nucleating agent in the magnesium sulfate crystallization process forming a synthetic monohydrate crystalline phase (Kieserite) and inhibiting the formation of the amorphous phase. The effect of the matrix is proved to induce certain structural deformation or changes not observed in the pure TCM sorption process. This phenomenon has the potential to benefit the stabilization of the TCM, e.g., inhibition of the formation of amorphous phase in magnesium sulfate composites.

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Comparison of UV resistance of HDPE added with hindered amine light stabilizers with different molecular structures

Jiang

Zhang

2020

Polymers for Advanced Techs

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UV resistance of versatile plastics has been received attention for a long time, especially of high‐density polyethylene (HDPE). It was studied systematically that hindered amine light stabilizer (HALS) with different molecular structures had an effect on the UV resistance of HDPE. The molecular weights of the two HALS were 423.7 and 2100–3000 g/mol, respectively. It was found that the low‐molecular‐weight HALS outperforms the polymeric one of HDPE matrix in UV resistances due to the different molecular structures. HDPE‐containing HALS with different molecular structures followed different degradation mechanisms during artificial accelerated aging. In addition, HDPE matrix composites with low‐molecular‐weight HALS show better mechanical properties than the polymeric one because of the decrease of delay of molecular chain fracture during irradiation. Therefore, HDPE matrix composites with low‐molecular‐weight HALS have better UV degradation resistance. However, polymeric HALS has the advantage of hard to move out of the sample surface.

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High-density polyethylene as phase-change material: Long-term stability and aging

Cited by 35 publications

References 31 publications

Thermally conductive high‐density polyethylene as novel phase‐change material: Application‐relevant long‐term stability

Thermally conductive high‐density polyethylene as novel phase‐change material: Application‐relevant long‐term stability

Hybridization of Salt Hydrates with Solid–Solid Phase Change Materials: A Novel Pathway to Sorption Thermochemical Materials Manufacturing

Comparison of UV resistance of HDPE added with hindered amine light stabilizers with different molecular structures

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