Study On The Preparation, Structure And Properties Of The Nanocomposites Based On The Polybenzoxazines

Polybenzoxazine is a new kind of thermosetting resin, and has some excellent characteristics, which is developed from traditional phenolic resin. However, with the developing of the society and the increasing of the requirement of the properties of the materials, polybenzoxazine, as a high performance material, the comprehensive properties of it should be improved further. Therefore, in this dissertation, the organically modified montmorillonite (OMMT), multiwalled carbon nanotubes (MWNTs) and polyhedral oligomeric silsesquioxanes (POSS) were used as the reinforcement phases to modify the polybenzoxazine, respectively.Firstly, by using in suit method, the effect of OMMT on the synthesis and the curing behavior of the benzoxazine monomer containing allyl group—bis (3-allyl-3,4-dihydro-2H-1,3- benzoxaziny) isopropane (ABZ), and the properties of final polymer (PABZ) were studied , the novel PABZ/OMMT nanocomposite was prepared. In the presence of OMMT, there were little effect on the synthesis of monomer ABZ and the curing temperature of ABZ, but introduction of clay delayed the cross link of allyl in ABZ and the exotherm amount of the system decreased. With the introduction of OMMT, the storage modulus of the nanocomposite increased and the...