Processing properties and pyrolysis behavior of novolak-hexamethylenetetramine mixtures

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Wich, Felix ; Flauder, Stefan ; Schneider, Natalie ; Fleck, Michael ; Langhof, Nico ; Krenkel, Walter ; Schafföner, Stefan:
Processing properties and pyrolysis behavior of novolak-hexamethylenetetramine mixtures.
In: Advanced Manufacturing : Polymer & Composites Science. Bd. 9 (2023) Heft 1 . - 2187687.
ISSN 2055-0359
DOI: https://doi.org/10.1080/20550340.2023.2187687

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Abstract

This work investigates the influence of the hexamethylenetetramine (hexa) content on therheological features, pyrolysis reactions, mass-loss kinetics and char yield for two phenolicresins, each with different novolak-hexa mixtures from 0 wt.-% to 15wt.-%. Curing and vis-cosity of resins was studied using a rheometer. Pyrolysis, evolved gases and char yield wereinvestigated with TG-FTIR-GC/MS. The obtained results show that the curing of resins shiftsto lower temperatures whereas the viscosity and the residual carbon amount both increasewith increasing hexa-contents. The presented data suggests a hexa-induced microgel forma-tion for phenolic resins. Models for viscosity and char yield were developed and present avaluable tool to tailor the resin-hardener mixture for the desired application, enable a moreefficient processing technology and contribute to a deeper understanding of the pyrolysis ofnovolak resins.