| CI | carbonyl index |
| DSC | Differential Scanning Calorimetry |
| FTIR | Fourier-transform infrared spectroscopy |
| HDPE | high-density polyethylene |
| E | Young’s modulus |
| EG | expanded graphite |
| m 0 | initial mass of a specimen |
| mx | actual mass of a specimen |
| keV | kilo electron volt |
| PCMs | phase change materials |
| PE | polyethylene |
| PP | polypropylene |
| PS | polystyrene |
| PW | paraffin wax |
| SEM | Scanning Electron Microscopy |
| SD | standard deviation |
| Tm | melting temperature |
| TPS | transient plane source |
| UV | ultraviolet |
| w | mass fraction of paraffin wax |
| W | watt |
| wt% | weight percentage |
| ΔHm | enthalpy of melting |
| σ | stress at break and |
| ε | elongation at break |
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