Thermal Analysis of Ablative Plastic Materials. Part I: Constant Heating Rate Thermogravimetry of Carbon/Graphite Cloth Reinforced Aromatic/Heterocyclic Resins to 1400C.
Abstract
Applications for polyaromatic and polyheterocyclic resins and their reinforced composites include ablative thermal protection, coatings, radomes, and structures. The response of these materials in high temperature service environments was predicted by kinetics. Kinetic parameters n, A, and E were evaluated for eight carbon and graphite cloth ablative composites. An integral method computer code and a maximum rate of weight method computer code were used for this purpose. A -325 sieve, dried 80 mg powder was run at 8.5C/min to 1400C in a helium purge of 1 liter/min. The relative order of resin thermal stability was polybenzimidazole > polyphenylene > polyimide > phenylphenol formaldehyde and phenol formaldehyde. Thermograms were plotted with a third computer code to compare with the experimental one. Graphite cloth composites gave the best overall agreement. Typical residual weight difference at constant temperature ranged from 0.8% for phenol formaldehyde/graphite cloth up to 2.3% for polyimide/carbon cloth. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1970
- Accession Number
- AD0714084
Entities
People
- R. W. Farmer
Organizations
- Air Force Research Laboratory