In order to solve the problems of brittleness and high curing temperature of polybenzoxazines

first

benzoxazine hydrochloride was synthesized with Bisphenol A-based Benzoxazine (BZ) monomer and hydrochloric acid. Second

Bz-MMT was prepared via ion-exchange reaction between Na-montmorillonite (Na-MMT) and benzoxazine hydrochloride

and then was characterized by FTIR

XRD and TGA. Thirdly

curing behavior of the mixture of BZ monomer and Na-MMT

or the mixture of BZ monomer and Bz-MMT

was followed by DSC. Fourthly

polybenzoxazine/montmorillonite nanocomposites PBZ/Na-MMT and PBZ/Bz-MMT were prepared by heating these mixtures of BZ monomer and MMT. Finally

TGA was used to test the thermal stability of PBZ and PBZ/Bz-MMT nanocomposites. The results show that for Bz-MMT

the basal spacing shows no obvious change

organic content increases and the onset decomposition temperture decreases as the amount of benzoxazine hydrochloride added increases. Compared with pure BZ monomer

the onset ring-opening polymerization temperature of the mixture of BZ monomer and Bz-MMT decreases obviously. Compared with PBZ

the char yeild

tensile strength and impact strength of PBZ/Bz-MMT nanocomposites all are increased.