Shape stabilised phase change materials based on a high melt viscosity HDPE and paraffin waxes

Mulan Mu, P. A. M. Basheer, Wei Sha, Yun Bai, Tony McNally

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    Abstract

    Shape stabilised phase change materials (SSPCMs) based on a high density poly(ethylene)(hv-HDPE) with high (H-PW, Tm = 56–58 °C) and low (L-PW, Tm = 18–23 °C) melting point paraffin waxes were readily prepared using twin-screw extrusion. The thermo-physical properties of these materials were assessed using a combination of techniques and their suitability for latent heat thermal energy storage (LHTES) assessed. The melt processing temperature (160 °C) of the HDPE used was well below the onset of thermal decomposition of H-PW (220 °C), but above that for L-PW (130 °C), although the decomposition process extended over a range of 120 °C and the residence time of L-PW in the extruder was <30 s. The SSPCMs prepared had latent heats up to 89 J/g and the enthalpy values for H-PW in the respective blends decreased with increasing H-PW loading, as a consequence of co-crystallisation of H-PW and hv-HDPE. Static and dynamic mechanical analysis confirmed both waxes have a plasticisation effect on this HDPE. Irrespective of the mode of deformation (tension, flexural, compression) modulus and stress decreased with increased wax loading in the blend, but the H-PW blends were mechanically superior to those with L-PW.
    Original languageEnglish
    Pages (from-to)68-82
    Number of pages15
    JournalApplied Energy
    Volume162
    Early online date11 Nov 2015
    DOIs
    Publication statusPublished - 15 Jan 2016

    Keywords

    • HDPE
    • Paraffin wax
    • Extrusion
    • Shape stabilised phase change materials
    • SSPCM

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