Citation: Nian Hua Huang, Qiang Zhang, Chou Fan, Jian Qi Wang. A mechanistic study of flame retardance of novel copolyester phosphorus containing linked pendant groups by TG/XPS/direct Py-MS[J]. Chinese Chemical Letters, ;2008, 19(3): 350-354. doi: 10.1016/j.cclet.2007.11.021 shu

A mechanistic study of flame retardance of novel copolyester phosphorus containing linked pendant groups by TG/XPS/direct Py-MS

a School of Textile and Materials, Wuhan University of Science and Engineering, Wuhan 430073, China;
b X-ray Photoelectron Spectroscopy Laboratory, South-Central University for Nationalities, Wuhan 430074, China;
c National Laboratory of Flame Retardant Materials, Beijing Institute of Technology, Beijing 100081, China

Received Date: 7 September 2007

Fund Project: This work is supported by China National Textile and Apparel Council (CNTAC No. 2006071).

The flame retardant mechanism of the copolyester phosphorus containing linked pendant groups was investigated by thermogravimetric (TG), X-ray photoelectron spectroscopy (XPS) and direct insertion probe pyrolysis mass spectrometry (DPMS) technique. TG results show that the incorporation of phosphorus containing unit linked pendant groups can destabilize the copolyester due to the cleavage of P-CH₂ bond, and phosphorus containing units cannot promote the char-formation of the copolyester during the thermal degradation of the copolyester. XPS spectra indicate that with the increase of the temperature, the P-CH₂ bonds of the copolyester break down gradually, the concentration of phosphorus in the condensed phase products decrease gradually and the chemical state of phosphorus does not change in the temperature of 250-380℃. Direct pyrolysis MS suggests that the P-CH₂ bonds cleavage occurs at pendant groups and species containing phosphorus can volatilize into the gas phase. A flame retardant mechanism is proposed for the gas phase mode of action of the halogen-free copolyester phosphorus containing linked pendant groups.
- Phosphorus containing copolyester,
- Thermal degradation,
- Flame retardant mechanism,
- TGA,
- XPS,
- Direct Py-MS
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