Poly[bis(trifluoroethoxy)phosphazene], [NP(OCH2CF3)2]n, depolymerizes at temperatures above 150° to yield the cyclic trimer, tetramer, pentamer, higher oligomers, and medium molecular weight polymers. The reactions were studied by the use of gel permeation chromatography, mass spectrometry, and solution viscosity. At temperatures near 400°, depolymerization of some polymer samples was accompanied by the elimination of small amounts of gaseous ClCH2CF3. This constitutes a diagnostic test for the presence of residual P-Cl bonds in the polymer. The depolymerization was also studied in the presence of acidic and basic reagents and in solution: acids accelerate the depolymerization. The reaction mechanisms are discussed. The thermal behavior of [NP(OCH2CF2CF2H)2]n is also described.
All Science Journal Classification (ASJC) codes
- Organic Chemistry
- Polymers and Plastics
- Inorganic Chemistry
- Materials Chemistry