Pppe-097 Site

PPPE‑097: Development and Characterization of a High‑Performance Polypropylene‑Based Phase‑Change Energy Storage Material

Pilot

2.4 Characterization

| Technique | Instrument | Parameters | |-----------|------------|------------| | Differential Scanning Calorimetry (DSC) | TA Instruments Q2000 | Heating/cooling rate 5 °C min⁻¹ (30‑80 °C) | | Thermogravimetric Analysis (TGA) | Mettler‑Toledo TGA/DSC 1 | 10 °C min⁻¹ under N₂ | | Thermal Conductivity (steady‑state) | Hot Disk TPS 2500 | 0.5 W power, 10 s measurement | | Scanning Electron Microscopy (SEM) | FEI Nova NanoSEM 450 | 5 kV, gold‑sputtered | | Mechanical Compression Test | Instron 5969 | 10 mm min⁻¹, 0‑30 % strain | | Cycling Test | Custom thermostatic chamber | 1000 cycles, 10 °C min⁻¹ ramp, 52 °C setpoint | PPPE-097

3.4 Cycling Durability

After 1000 heating/cooling cycles, DSC indicated a latent‑heat retention of 95 % (ΔH = 176 J g⁻¹). No significant shift in melting point (< 0.5 °C) was observed, and TGA showed unchanged decomposition onset (~ 300 °C). 10 °C min⁻¹ ramp