Hyperbranched polyester modified epoxy resin has excellent performances.
Hyperbranched polyester modified epoxy resin has excellent performances. Hyperbranched polymer has low viscosity, high functionality, no chain entanglement and good solubility characteristics, provides a new way for epoxy toughening. Modifying the hydroxyl-terminated hyperbranched polyester (AHBP) obtained hyperbranched polyester with carboxyl end group (CHBP), not only has the toughening effect, but also play the role of a curing agent. Using CHBP as flexibilizer and curing agent, study its toughing effect on epoxy/MTHPA (EP/MeTHPA) curing system; CHBP molecular terminal all with carboxyl has the best toughening effect, impact strength achieves 18.5 kJ/m2; when the carboxyl terminal content reaches 40%, the impact strength of the epoxy resin is only 7.8 kJ/m, CHBP has no toughening effect at this time. When CHBP mass fraction is 15%, tensile strength achieves the maximum , 64.86 Mpa; when CHBP mass fraction is 15%, the Tg of the resulting cured epoxy resin is 106 ℃, increased about 6 ℃. Weihai CY Dendrimer Technology Co. Ltd forwards from "Study on carboxyl - terminated hyperbranched polyester modif ied epoxy resin curing systems" Wang Xiaoke, Tian Mi (Chongqing University of Science and Technology, Chongqing 401331) Thermosetting Resin, 2008,3 (23) , 25-28