Effect of hyperbranched polymer modified on the impact strength of epoxy resin at cryogenic temperature

In order to investigate the effect of hyperbranched polymer modified on impact strength of epoxy resin at 77K. One modifier called H204 was employed to methyl nadic anhydride (MNA) cured diglycidyl ether of bisphenol A (DGEBA) epoxy resin system. The impact strength at 77 K was studied and the results indicated that introduction of modifier used in this study can enhance the impact strength at cryogenic temperature. The 58.57% increase was obtained by addition of 10 wt% H204 into the epoxy matrix. Furthermore, scanning electron microscopy (SEM) was used to investigate the fracture mechanism and strengthening effect.