Synthesis and Catalytic Graphitization of Silicon Containing Arylacetylenic Resin

Abstract

Vinyl(triphenylethynyl)silane ((ph-C≡C)₃-Si-C=CH₂) (VTPES) was synthesized by Grignard reaction. Its molecular structure was characterized by means of fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance (¹H-NMR, ¹³C-NMR, and ²⁹Si-NMR). Poly(vinyl(triphenylethynyl))silane (PVTPES) was prepared by thermal polymerization and the catalytic graphitization of PVTPES with nickel, and Fe₂O₃ was also investigated between 900°C and 1600°C under nitrogen atmosphere. The effects of heat-treatment temperature and catalyst concentration on graphitization behavior were analyzed by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM) and Laser Raman spectroscopy (LR). The results show that the presence of the transition metals produced graphitized areas with three-dimensional stacking order, and the Fe₂O₃ was more effective than nickel for catalytic graphitization. The key factor to affect graphitization behavior of PVTPES was the heat-treatment temperature compared with the catalyst concentration.

Keywords:

• Poly(vinyl(triphenylethynyl))silane
• catalytic graphitization
• nickel
• Fe₂O₃
• graphitization behavior

Acknowledgments

The authors gratefully acknowledged the support of the National Natural Science Foundation of China (NSFC) (Grant No. 50773017, 50973024).