| Autor: |
White, M. L., Waddon, A. J., Atkins, E. D. T., Farris, R. J. |
| Zdroj: |
Journal of Polymer Science Part B: Polymer Physics; 15 November 1998, Vol. 36 Issue: 15 p2811-2819, 9p |
| Abstrakt: |
A series of new copolymers of tetrafluoroethylene (TFE) and hexafluoropropylene (HFP) containing up to 50 mol % of the hexafluoropropylene comonomer have been investigated with respect to chain conformation and crystal structure using wide-angle X-ray diffraction (WAXD). Increasing HFP content leads to significant departures from the highly ordered crystalline structure of the homopolymer PTFE; the helical conformation of the chain relaxes and untwists to accommodate the larger &bond;CF3 pendant group in the HFP unit. Simultaneously the lateral hexagonal packing of the helices becomes less ordered and the a-dimension of the hexagonal cell increases. The above effects are progressive with increasing HFP content. At 50 mol % HFP incorporation the structure is a disordered crystalline phase. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 28112819, 1998 |
| Databáze: |
Supplemental Index |
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