By combining the copolymerizing modification with the synthesis of hyperbranched polysiloxane containing terminate amine groups (HBPSi(N)) in one step

a new kind of modified bismaleimide (coded as B/D/H(N)) resins was developed.Comparing to the resin made up of 4

4′-bismaleimidodiphenylmethane (BDM) and o

o′-diallylbisphenol (DBA) (coded as B/D)

the effect of HBPSi(N) content on the properties of B/D/H(N) was discussed.Results show that HBPSi(N) content has great influence on the properties of B/D/H(N)

the small incorporation of HBPSi(N) into B/D resin not only significantly improves the toughness

but also effectively decreases the gel time

improves the heat resistance and dielectric properties and reduces water absorption.These improvements result from the change in the chemical structure of the network by the incorporation of HBPSi(N).The outstanding integrate properties of B/D/H(N) indicate great potentiality in fabricating advanced polymeric composites and high performance adhesives.