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- W2046206504 abstract "The chemical processes involved in the reactions between novolac resins, furfuryl alcohol (FA), and hexamethylenetetramine (HMTA) have been studied by solid-state NMR spectroscopy. A highly cross-linked homogeneous network which incorporates both novolac and furan entities is formed. The initial reaction below 90 °C is between the novolac and HMTA and produces mainly benzoxazine and benzylamine intermediates. When the temperature is increased to 90−120 °C, FA reacts with these initially formed intermediates to generate methylene-linked novolac/furan structures as the major products. Minor amounts of nitrogen-containing structures are also formed. In the absence of HMTA, only a minor amount of cross-reactions occur between novolac and FA, and cross-linked structures are not formed. The curing reactivity and chemical structures of the finally cured materials can be controlled through variation of the HMTA ratio, FA content, and curing conditions." @default.
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- W2046206504 date "1998-06-11" @default.
- W2046206504 modified "2023-10-12" @default.
- W2046206504 title "Chemistry of Novolac/Furfuryl Alcohol Resins Cured with Hexamethylenetetramine: A Solid-State NMR Study" @default.
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- W2046206504 doi "https://doi.org/10.1021/cm9800175" @default.
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