Decomposition rate of a phenolic resin.

Abstract

A test procedure and method of analysis is presented, whereby the overall decomposition rate of the phenolic binder in a silica-phenolic ablator may be separated into its component reactions. The Arrhenius rate equations for these separate reactions are then determined and a reaction mechanism is postulated which predicts the decomposition rate of the phenolic for both constant and varying test temperatures. To the best of the authors' knowledge, this is the first theory which accurately describes the decomposition rate of phenolic resin, and the method should be applicable to other highly cross-linked polymers.

Modeling Pyrolysis of Charring Materials: Determining Kinetic Properties and Heat of Pyrolysis of Medium Density Fiberboard

“…In New Zealand, PF resin is commonly applied by the manufacturers. , Li and Li investigated the effect of PF resin on the overall pyrolysis process of wood ceramics MDF using TGA, and it was found that the TG curve of MDF can be reproduced from the combined TG curves of wood fibers and resin. Several studies focused solely on the pyrolysis of PF resin − show that the thermal decomposition of PF resin starts at 160–180 °C and continues to over 1000 °C.…”

“…Hence, the mass fraction of the eventual resin can be less than 10%. Studies on PF resin have revealed that the pyrolysis of PF resin consists of either three , or four , parallel reactions. The three parallel reactions theory has been widely accepted, and these are the formation of additional cross-links, the breaking of cross-links, and the stripping of aromatic rings.…”

Thermal decomposition behavior of silica‐phenolic composite exposed to one‐sided radiant heating

“…When a radiant heat flux is applied to the SiFRP composites, pyrolysis reactions of phenolic resin occur and the resin system degrades to form gaseous products and carbonaceous char. This thermal decomposition process is so complex and great deals of researches are performed on this subject . Generally, the thermal decomposition of a polymeric composite follows more than one mechanism.…”

Chapter 14: Mathematical Modeling of Heat and Mass Transfer during Aerothermochemical Destruction of Thermal Protection Materials

“…Naturally, it seems reasonable to use this characteristic temperature of resin pyrolysis as the above-introduced parameter T f . Bishop and Minkowycz [5] developed a mathematical model of resin pyrolysis, where this process was presented as a set of independent chemical reactions whose reaction rates were written in the form of the Arrhenius law. This research direction seems promising, though the lack of reliable data on kinetic constants of these reactions does not allow this model to be used in practice at the moment.…”