Synthesis and characterization of low viscosity aromatic hyperbranched poly(trimellitic anhydride diethylene glycol) ester epoxy resin

摘要

Low viscosity aromatic hyperbranched poly(trimellitic anhydride diethylene glycol) ester epoxy resin (HTDE) was synthesized from the reaction between epichlorohydrin (ECH) and carboxyl-ended hyperbranched poly(trimellitic anhydride diethylene glycol) ester (HTD). HTD was prepared from inexpensive materials A_2 (diethylene glycol, DEG) and B_3 (trimellitic anhydride, TMA) monomers by a pseudo-one step method. Molecular weight of the HTD was calculated by its acid value with a Recursive Probability Approach, and its degree of branching (0.62～0.71) was characterized by model compounds and ~1H-NMR-minus spectrum technology. HTDE has an epoxy equivalent weight of <530 g/mol and its viscosity of <700 cp, respectively. The structure of the AB_2 monomer, HTD and HTDE were also characterized by MS, ~1H-NMR and FT-IR spectra technology. HTDE is an ellipsoid-like molecular with a size of <10.34 nm. This low viscosity novel epoxy resin has important applications in the fields of no-solvent coatings.