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Surface structure, grafted chain length, and dispersion analysis of PBT prepolymer grafted nano-silica

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Abstract

Dispersion of nano-particles plays a key role in preparing high-performance nano-composites. Steric hindrance stability mechanisms can be applied to improve the dispersibility and stability of nano-particles. The steric hindrance layer can be established when graft polymerization of PBT prepolymer is performed onto the surface of nano-particles. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) characterization revealed the chemical linkage between nano-silica and the grafted prepolymer. Based on XPS and thermal gravimetric analysis (TGA), it is conjectured that the grafted PBT prepolymer was mainly distributed on the surfaces of nano-silica. From transmission electron microscopy (TEM) images the polymer coverage can be observed. System vacuum played an important role in determining the graft amount and the length of the grafted chains. The relationship between vacuum and chain length was investigated by calculating \( \overline M _v \) and TGA. The lower the vacuum, the more the weight loss, and thus the longer the grafted chains. Sedimentation experiments and atomic force microscope (AFM) characterization showed that the grafted nano-silica prepared under the vacuum of 3.9 kPa had the best dispersibility and could disperse homogeneously in tetrachloroethane. Under these conditions, the length of the grafted molecule chains was approximately, 16 units.

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Fig. 1 FTIR
Fig. 2 TGA
Fig. 3 Si2p
Fig. 4 TEM
Fig. 5 The
Fig. 6 AFM

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Acknowledgement

This work was supported by NJUST Funding, XKF05010.

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Authors and Affiliations

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

    Jianfei Che, Yinghong Xiao, Baoyong Luan, Xiaoming Dong & Xin Wang

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  1. Jianfei Che
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  2. Yinghong Xiao
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  3. Baoyong Luan
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  4. Xiaoming Dong
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  5. Xin Wang
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Correspondence to Jianfei Che.

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Che, J., Xiao, Y., Luan, B. et al. Surface structure, grafted chain length, and dispersion analysis of PBT prepolymer grafted nano-silica. J Mater Sci 42, 4967–4975 (2007). https://doi.org/10.1007/s10853-006-0537-2

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  • DOI: https://doi.org/10.1007/s10853-006-0537-2

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