series of novel epoxy resins were prepared from chemically modified
rosin, mainly constituted of abietic acid, diglycidyl ether of
bisphenol-A (DGEBA) in different percentages as co-reactants, and
isophorone diamine as cross-linking agent. Reactive epoxide groups were
introduced in the structure of this common pine tree derivative. The
chemical structures of various epoxidized rosin acids precursors were
confirmed by NMR spectroscopy. Differential scanning calorimetry and
dynamic mechanical analysis were used to determine the glass transition
temperature and the elastic modulus of the cured epoxy resins.
Relatively rigid materials with thermo-mechanical properties depending
on the structure of rosin acid derivatives and their ratios with DGEBA
were obtained. Epoxy precursors based on renewable rosin can be
efficiently used as co-additives of DGEBA for epoxy products.
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