Effects of DOPO on flame retardancy and mechanical properties of PA66/GF composites
Adding glass fiber(GF)can effectively improve the mechanical strength of nylon 66(PA66),but the resulting PA66/GF composite material tends to exhibit a"candle effect"during combustion,which does not meet the requirements for use and needs flame retardant modification.Different contents of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide(DOPO)were melt blended with PA66/GF composite materials to in-vestigate the effect of DOPO content on the flame retardant performance,crystallization behavior,melt flow properties,and mechanical properties of PA66/GF composite materials.The results show that the addition of DOPO increases the residual char content,limiting oxygen index,and melt flow rate of PA66/GF composite ma-terials,while reducing the melting crystallization temperature and relative crystallinity.When the DOPO content is low,it is uniformly dispersed in the resin matrix,maintaining the mechanical properties of the composite ma-terial.However,further increasing the DOPO content may lead to aggregation and acid-induced degradation of PA66 molecular chains,resulting in a decrease in the mechanical properties of the composite material.There-fore,the preparation of flame retardant PA66/GF composite materials needs to comprehensively consider both their mechanical properties and flame retardant performance.
DOPOPA66/GFcrystallization behaviormechanical propertiesflame retardant modificationcomposite material
万方数据
维普
