Flammability and Thermal Stability of Polyphosphazenes Copolymers. Part II.
Abstract
Flame spread and thermal stability measurements have been made on filled and unfilled poly(fluoroalkoxyphosphazenes) (PNF sheet) and poly(aryloxyphosphazene) (APN sheet and foam materials). The PNF samples were also filled with silica or carbon black and the APN with aluminum trihydrate. Burn velocity measurements were made under steady state conditions in a vertically downward burning mode at different oxygen/nitrogen concentrations. The effect of sample thickness on burn rate was also studied for the foam specimens. Relative smoke density measurements were made using a photocell assembly, and limiting oxygen index (L.O.I) determinations were carried out in accordance with standard ASTM procedures. Thermal stabilities were measured in air and nitrogen using a Perkin Elmer TGS-2 apparatus at heating rates varying from 2.5 to 80 C min. A temperature span of 50 to 650 C was covered in both thermogravimetric and differential thermogravimetric measurements. Activation energies for degradation were determined from these data. The effect of fillers on thermal stability and flammability characteristics were determined. Glass transition temperature were also measured as an aid to polymer characterization.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 19, 1979
- Accession Number
- ADA072114
Entities
People
- J. H. Magill
- S. V. Peddada
Organizations
- University of Pittsburgh