Abstract
X-Ray diffraction investigation of oriented fibers of high molecular weight poly(difluorophosphazene), (NPF2)n, revealed the presence of two molecular conformers. Conformer A, with a chain repeating distance of 6.49 A, was detected at temperatures between +25 and ---36°. Conformer B, observed near ---56°, showed a fiber (c) axis repeat of 4.86 A. An orthorhombic unit cell (space group Cmc2i) was assigned with a = 8.69 å and b = 5.38 å. Structure factor calculations for conformer B indicated a cis, trans-planar chain conformation, with P-N = 1.52 A, P-F = 1.47 A, F-P-F = 95°, N-P-N 119°, and P-N-P 136°. The low-temperature flexibility and high-temperature depolymerization of this polymer were also studied.
Original language | English (US) |
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Pages (from-to) | 1120-1123 |
Number of pages | 4 |
Journal | Inorganic chemistry |
Volume | 11 |
Issue number | 5 |
DOIs | |
State | Published - May 1 1972 |
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Inorganic Chemistry