| Autor: |
Kwan, A. T., Efremov, M. Yu., Olson, E. A., Schiettekatte, F., Zhang, M., Geil, P. H., Allen, L. H. |
| Zdroj: |
Journal of Polymer Science Part B: Polymer Physics; 1 June 2001, Vol. 39 Issue: 11 p1237-1245, 9p |
| Abstrakt: |
We used thin-film differential scanning calorimetry to investigate the melting of isolated polyethylene single crystals with lamellar thicknesses of 12 ± 1 nm. We observed the melting of as few as 25 crystals. Over a wide number of crystals (252000 crystals), the heat of fusion was 40% larger than the bulk value. The melting temperature of the isolated single crystals was 123 ± 2 °C, 9 °C lower than that of the bulk material. We also measured the heat of fusion of quenched crystals (±15%) over a wide range of heating rates (20,000100,000 K/s). Annealing the quenched crystals resulted in shifts in the endotherm peak by as much as 15 °C. © 2001 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 39: 12371245, 2001 |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
Plný text