Phosphate-Containing Flame-Retardant Polymers with Good Compatibility to Polypropylene. I. The Effect of Phosphate Structure on Its Thermal Behavior

摘要

Phosphate-containing flame-retardant polymers wre synthesized via a partial-substittuion reaction of poly(vinyl acetate) with stearylphosphonic chloride (SPPC) and diethylchlorophosphate in various substitution ratios. SPPC had been previusly synthesized from phosphonic dichloride and stearyl alcohol. The synthesized SPPC and the flame-retardant polymer products were characterized by Fourier transform infrared (FTIR) spectra analysis. The quantitative analysis of phosphours inthe polymer proudcts was carried out by EDS (Energy Dispersion Spectrummeter) analysis. The real substitution ratios of the polymer products were estimated by the atomic number ratio of carbon and phosphate inproudcts from EDS data. Variations in the glass-transition temperature and thermal-decomposition temperature of the proudcts were investigated. The char of polymer products produced after thermogravimetric analysis (TGA) was also analyzed by FTIR, and the reults show that different phosphate substitution leads to diffrent char developments during the heating of TGA.