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This work proposes the use of a diisocyanate as curing agent for novolac-type lignin–phenol–formaldehyde (LPF) resins, instead of typical hexamethylene–tetraamine (HMTA), with the aim of overcoming the loss of reactivity of lignophenolic resins resulting from the introduction of lignin. Curing LPF resins with methylene–diisocyanate (MDI) and HMTA has been investigated through Fourier transform infrared...
During the last decades lignin has been investigated as a promising natural alternative to petrochemicals in phenol–formaldehyde (PF) resin production, due to their structural similarity. Physico-chemical characterization of three types of lignin, namely kraft pine lignin (L1), soda–anthraquinone flax lignin (L2), and ethanol–water wild tamarind lignin (L3) has been evaluated to determine which one...
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