Intermolecular hydrogen bonding in novolak resins In the solid state (homoassoclatlon) and with other hydrogenaccepting substances (heteroassociation) has been investigated by using differential scanning calorimetry to observe the changes In the glass-transition temperatures. It has been demonstrated that solid novolaks are self-associated aggregates interacting through the polar hydroxyl groups of neighboring molecules. Heteroassociations with nitrogen containing substances make stronger hydrogen bonds at temperatures above the glass-transition temperature of novolak resin. Such a hydrogen bonding in the case of hexamethylenetetramine leads to the complete proton transfer and cleavage of the carbon-nitrogen covalent bond and can be considered a driving force for the curing reaction. An appropriate mechanism for the novolak curing reaction with hexamethylenetetramine is proposed.
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