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The melting points and appearances of Ch2-PEGn. The melting point was recorded as the midpoint value in the melting temperature range to facilitate comparison.
| Samples | Melting Point (°C) | Appearance (25 °C) |
|---|---|---|
| PEG600 → Ch2-PEG600 | 20 → 33 (↑) | Clear liquid → Clear semi-solid |
| PEG1000 → Ch2-PEG1000 | 33 → 40 (↑) | White paste → Clear solid |
| PEG2000 → Ch2-PEG2000 | 52 → 47.5 (↓) | White flake → White powder |
