Polybis(m‐chlorophenoxy)phosphazene. Macromolecular characterization and degradation studies

摘要

AbstractThe macromolecular structures of five polybis(m‐chlorophenoxy)phosphazene samples are critically analyzed. There are significant variations in the solubility behavior and physical properties of the polymers. Property differences are attributed mainly to the incomplete nucleophilic substitution of the dichlorophosphazene polymer precursor. All the polymers are found to have high molecular weights and broad, bimodal molecular weight distributions. However, differences in branching are noted and the presence of thermally labile “weak links” on the polymer chain backbones is suspected. At 165°C in static air, the polyphosphazene degrades by a random degradation mechanism and for long exposure times is considerably more stable than polys