Study on property of hyperbranched polyphosphate modified benzoxazine resin
Xu Peijun1,Zhu Xingtian1,2,Zhang Ru1,Du Xiaoming1
1.School of Materials Science and Engineering,Chang'an University,Xi'an 710064; 2.the No.6 Engineering,LED of China Railway 20TH Bureau Group,Xi'an 710016
Abstract: Bicyclic benzoxazine resin (B-BOZ) is a novel kind of phenolic resin with excellent heat resistance,mechanical properties and low curing shrinkage rate,but it still exists many problems when used as high performance resin,such as high curing temperature (above 200℃),not enough thermal resistance and flame retardancy,and the brittleness.Therefore,hyperbranched polyphosphate (HBPP) was used to improve the thermal resistance,flame retardancy and curing process of B-BOZ by its highly branched phosphorus-containing structure and a large number of phenol groups.The results showed that the curing temperature of B-BOZ resin can be greatly decreased by HBPP with large number of phenol groups.Thermal resistance and flame retardancy of cured B-BOZ resin also can be significantly improved by HBPP with the phosphorus-containing structure.