Hyperbranched polyesters (HBPE) have been synthesized using 2, 2-bis (hydroxymethyl) propionic acid (bis-MPA) as monomer and triethanol amine as core via condensation reaction. Different polymers like first-generation (G1), second-generation (G2), and third-generation (G3) have been synthesized and characterized. Synthesized G3 HBPE having weight-average molecular weight of 2828 has been considered for this study. An aliphatic amine (diethylenetriamine) cured epoxy resin has been modified by the addition of 1, 2, and 5 wt.% G3 HBPE to form epoxy/HBPE blends. Thermal, electrical, and mechanical studies of the epoxy/HBPE blends were carried out and the results were compared with cured epoxy resin. Incorporation of 1, 2, and 5 wt.% G3 HBPE in epoxy resin has negligible effect on thermal and electrical properties but shows an increase in mechanical properties, i.e., tensile strength, Barcol hardness, and impact strength, indicating the toughening of the epoxy resin.
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Viswanath et al. (2009) studied this question.
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