纳米SiO2表面上的聚对苯二甲酸丁二醇酯预聚物接枝改性

纳米SiO2表面上的聚对苯二甲酸丁二醇酯预聚物接枝改性;纳米粒子; 表面改性;接枝; 聚对苯二甲酸丁二醇酯

Graft Modification of Polybutylene Terephthalate Prepolymer on the Surface of Nano-SiO2

Steric hindrance layer can be established when the graft polymerization of PBT prepolymer was performed onto the surface of the nano-particles, which not only increases the dispersibility of the particles, but also improves the compatibility between the nano-particles and the resin matrix. The FTIR spectrum shows that the grafted nano-particles exhibit absorption peaks which are the characteristic of the ester groups in PBT prepolymer. The Si2p peak of the grafted nano-silica in the XPS spectrum indicates that the binding energy of Si2p has shifted to the low energy side, and Si-O-C bond has been formed between SiO2 and PBT prepolymer. Vacuum plays an important role in determining the grafting amount and the length of the grafted chains. The relationship between the vacuum and chain length was investigated by TG and Mv. The lower the vacuum, the longer the grafted chains, and thus the more the mass loss. The AFM image shows that the particles dispersed in tetrachloroethane are about 50 nm in diameter, and they were almost dispersed homogeneously as original particles without any agglomeration or adhesion. The SEM image of the nanocomposite shows that the particles dispersed homogeneously in PBT matrix, there are well adhered at the interface.