Effects of Fullerene Soot on the Thermal Decomposition and Fourier Transform Infrared Spectrum of PEG
HAN Xu1, LI Shu-fen1*, ZHAO Feng-qi2, PAN Qing2, YI Jian-hua2
1. Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China 2. Xi’an Modern Chemistry Research Institute, Xi’an 710065, China
Abstract：Effects of fullerene soot (FS) on the thermal decomposition and Fourier transform infrared spectrum (FTIR) of polyethylene glycol (PEG, molecular weight=20 000) were investigated by thermal analysis (TG-DTG) and in-situ FTIR experiments. The results of thermal analytical experiments showed that the addition of FS postponed not only the initial decomposition temperatures but also the temperatures at maximum decomposition rate of PEG. The maximum decomposition peak temperatures increased and the maximum decomposition rates were lowered even with the addition of 0.1%FS. The in-situ FTIR experiments proved that there was no difference between the IR spectra of PEG and PEG with 10%FS. There wasn’t any new chemical band formed but Vander waals force between FS and PEG. Although the addition of FS didn’t influence the constitution of decomposition products of PEG, it obviously increased the decomposition temperature and the decomposition rate of PEG. Through the researches on condensed phase and gaseous phase FTIR spectrum of PEG and PEG with 10%FS, one could see that the effect of FS on the condensed phase FTIR spectrum of PEG was not obvious, but the addition of FS markedly enhanced the occurrence temperatures of most gaseous decomposition products of PEG. These results showed that the effect of FS on thermal decomposition of PEG was through the absorbance and desorption of gaseous phase decomposition products. With the temperature elevated, the gaseous products were gradually desorbed from the activity centers and the decomposition of PEG continued. The thermal decomposition peak of PEG was moved toward higher temperature with the addition of FS than that without FS.
韩旭1,李疏芬1*,赵凤起2,潘清2,仪建华2. 富勒烯灰对聚乙二醇热分解和红外光谱的影响[J]. 光谱学与光谱分析, 2008, 28(12): 2789-2792.
HAN Xu1, LI Shu-fen1*, ZHAO Feng-qi2, PAN Qing2, YI Jian-hua2. Effects of Fullerene Soot on the Thermal Decomposition and Fourier Transform Infrared Spectrum of PEG. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(12): 2789-2792.
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