How does the network position of the furan ring affect char formation in furan-based epoxy resins?

Label:chem

Topic
Thermogravimetric analysis (TGA) and evolved gas analysis were used to study char formation. PolyTGDFDA has main-chain furan rings, while PolyFDE and PolyMethyl-FDE have pendant furan rings.
Answer
The network position of the furan ring has a greater impact on char formation than ring substitution. PolyTGDFDA, which contains main-chain furan rings, exhibited the highest char yield of 44.0±0.6% at 1000 ℃ in a nitrogen atmosphere. In contrast, PolyFDE, with pendant, monosubstituted furan rings, showed a char yield of 38.6±0.7%, while PolyMethyl-FDE, with pendant, disubstituted furan rings, yielded 22.4±2.19%.
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