Search

Poly(vinylidene chloride) (PVDC) was decomposed by thermal treatment to 800 °C under inert atmosphere, using thermogravimetry-mass spectrometry (TG–MS). The evolvement of hydrogen chloride was still observed at 800 °C for the degradation of PVDC. The dehydrochlorination process was divided into two stages according to difference in the formation rate of hydrogen chloride and trichlorobenzene. Dehydrochlorination was accompanied by the evolvement of trichlorobenzene during the first stage below 380 °C, but trichlorobenzene was not observed during the second stage above 380 °C.

The removal of hydrochloric acid utilizing magnesium-aluminum oxide (Mg–Al oxide), as prepared by the thermal decomposition of hydrotalcite (HT), was investigated. Cl−in hydrochloric acid can be removed almost 100% by adding 1.75 times the stoichiometric quantity of Mg0.70Al0.20O at 60 °C for 1 h. Mg2+and Al3+in solution after the reaction were not recognized, because the solution was weakly alkaline.

Degradation behavior of poly(vinyl chloride) (PVC) was analyzed by means of simultaneous thermogravimetry-mass spectrometry (TG-MS). Weight loss and the production behavior of hydrogen chloride and organic materials with PVC degradation was clearly divided into three stages at lower heating rate. Dehydrochlorination was occurred mainly in the first and second stages. Benzene was formed mainly in the first stage with dehydrochlorination.

The analysis of the lead surface immersed in aqueous nitrate solutions by X-ray photoelectron spectroscopy (XPS) shows the formation of passive oxide layer containing nitrogen compound. The oxide layer formed on the lead surface in aqueous ammonium nitrate solution was hydrolyzed and cracked.