Pentabromobenzyl acrylate molecular formula is C10H5O2Br5, the relative molecular weight is 556.69, the theoretical bromination content is 71.77%, the appearance is nearly white powder. When polypentabromobenzyl acrylate is used for flame retardant PBT, it does not change the melting temperature, crystallization temperature and latent heat of the material, nor does it change the crystallinity of the material. This shows that the flame retardant is in the amorphous zone of PBT, so it has no effect on the tensile strength of the flame retardant material. Because the polyacrylate part of pentabromobenzyl acrylate can effectively promote the compatibility of polymer substrate and flame retardant, but also promote the compatibility between the treated glass fiber and pentabromobenzyl, the flame retardant PBT containing glass fiber with pentabromobenzyl acrylate can greatly reduce the flame retardant frosting phenomenon after high temperature aging of the material. At the same time, the tensile strength and impact strength of the material are maintained, and the bromine content that makes the flame retardant level of the material reach UL94V-O level can be less than 6phr. In addition, pentabromobenzyl in polypentabromobenzyl acrylate can confer excellent UV resistance with flame-retardant polymers, which is unmatched by many other brominated flame retardants. With other high molecular weight bromine
Compared with flame retardants, polypentabromobenzyl acrylate also has advantages, such as its higher flame retardant efficiency than brominated polystyrene, but it does not make the flame retardant material brittle and lead to a significant decrease in the impact strength of the material as brominated epoxy polymers.