Liu, Jinghong published the artcileChar Structure and Charring Mechanism of Phosphazene-Based Epoxy Resin during Combustion, Synthetic Route of 191-07-1, the publication is Polymer Degradation and Stability (2022), 109927, database is CAplus.
The char structure and charring mechanism were important factors in determining the flame retardancy of the polymer. However, relevant research on phosphazene-based polymers, which have excellent fire retardancy, was limited. In our previous work, a phosphazene-based epoxy resin (EHEP-D230) was obtained with a honeycomb-like structure char after combustion. Herein, we further investigated gaseous phase degradation products of the resin through TGA-FTIR, while the condensed phase degradation products, the char, were studied using a variety of characterization techniques, including EDS mapping, FTIR, XPS, solid 31P-NMR and Raman. The study shows that nitrogen products of phosphazene were found in both the gaseous (e.g. NH3) and condensed phases (e.g. pyridine, pyrrole, and quaternary-nitrogen structure), whereas phosphorus products (e.g. phosphoric acid-like structures) were discovered in the condensed phase with an uneven distribution. This finding was confirmed by the degradation of the other two phosphazene epoxy resins (HGETP-D230 and HGETP-MNA). Addnl., the distance between two defects in the EHEP-D230 char (doped carbon structures) might range between 5.6 ? and 17.2 ?, indicating that the char of EHEP-D230 is highly disordered. Subsequently, we compared our research results with those of previous studies on phosphazene degradation in the field of epoxy, and offered a global chem. structure of EHEP-D230’s char. Furthermore, a charring mechanism involving the aggregating-pressing process of phosphorous was proposed.
Polymer Degradation and Stability published new progress about 191-07-1. 191-07-1 belongs to catalysis-chemistry, auxiliary class Electronic Materials, name is Coronene, and the molecular formula is C24H12, Synthetic Route of 191-07-1.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia