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Citation: CHE Jian-Fei, LUAN Bao-Yong, DONG Xiao-Ming, YANG Xu-Jie, LU Lu-De, WANG Xin. Graft Modification of Polybutylene Terephthalate Prepolymer on the Surface of Nano-SiO₂[J]. Chinese Journal of Applied Chemistry, ;2006, 23(1): 54-58. shu

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

1.
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210014

Corresponding author: CHE Jian-Fei,
Received Date: 30 December 2004
Available Online: 10 April 2005
Fund Project: 国家自然科学基金资助项目(50472047) (50472047)

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 Si_2p peak of the grafted nano-silica in the XPS spectrum indicates that the binding energy of Si_2p 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 M_v.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.
- nano-particles,
- surface modification,
- graft polymerization,
- polybutylene terephthalate
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Graft Modification of Polybutylene Terephthalate Prepolymer on the Surface of Nano-SiO2

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