Propylene chloride, decomposition

TG-IR has also been used to examine the thermally induced decomposition products of polyvinyl chloride (PVC), polyacrylamide, tetrafluoroethylene-propylene, styrene-... 

The presence of oxygen accelerates the thermal decomposition [3]. Decomposition at high temperatures yields CO2, H2O, and HCI [4]. Some other reports regarding polychloroprene thermal decomposition indicate formation of hydrogen chloride at 377° C [5], 2% of monomer, 70% of the chlorine released as HCI [6], for pyrolysis between 170° C and 400° C [7], and for pyrolysis between 400° C and 500° C formation of HCI, methane, ethylene, propylene (trace) [7]. Other pyrolysis studies also were reported [8-11],... 

Salicylamide. Salicylanttde. M-hydroxybenzumide. is a derivative of salicylic acid that has been known for almost a century. It is readily prepared from salicyl chloride and ammonia. The compound occurs as a nearly odorless, white crystalline powder. It is fairly stable to heat. light, and moisture. It is slightly soluble in water (1 500) soluble in hot water, alcohol (1 15). and propylene glycol and sparingly soluble in chloroform and ether. It is freely. soluble in solutions of alkalies. In alkaline solution with sodium carbonate or triethanolamine, decomposition takes place, resulting in a yellow to red precipitate. 

A more detailed analysis of the composition of the volatile portion by the method of mass spectrometry showed that the products liberated from polyvinyl chloride at 400°C under vacuum in 30 min contain not only hydrogen chloride, but also 26 different aliphatic and aromatic compounds saturated and unsaturated hydrocarbons, diehloroethane, allqrl-and alkylenebenzenes are detected ethylene, propylene, ethane, pentane, hexane, benzene, and toluene predominate quantitatively [30]. It has been found by the methods of chromatography and IR- and UV-spectrom-etry that when the pyrolysis temperature is raised to 450-500°C, substances with three to five condensed aromatic nuclei appear among the volatile decomposition products of polyvinyl chloride [31]. 

If organolead compounds are heated, the radicals are easily produced by a decomposition. Organolead compounds have been investigated as the polymerization initiators of various kinds of unsaturated compounds [9,10,39,40]. The unsaturated eompounds are ethylene, propylene, butadiene, styrene, acrylonitrile and vinyl chloride, etc. Organolead compounds are tetraethyllead, tetracyclo-hexyllead, tetravinyllead, tetraethyllead and TiCl3, the mixtures with organoalu-minum compounds or transition metal halides [9,10,39,40]. 

Visible spectrophotometry still finds extensive use in the determination of some anions such as chloride, phosphate and sulfate formed by the decomposition of chlorine, phosphorus and sulfur in polymers. An extensive modern application of visible spectrophotometry is in the determination of organic substances, including non-ionic detergents, in polymer extracts. An example is the determination of vanadium in ethylene-propylene rubber (see Method 1.3 at the end of this chapter). 

ZnO accelerates photo-oxidation of polyolefins [145, 1272, 1273, 1275, 1314, 1708], poly(ethylene-co-propylene) [1275, 1996], poly(vinyl chloride) [687, 805, 1667] and polyamides [1314, 1854, 2093]. UV excitation of the ZnO dispersed in atactic polypropylene induces a primary hydroperoxidation and decomposition of the formed hydroperoxides into alcohols and ketones [1708] ... 

Infrared spectroscopy and thermogravimetry have been used in polymer analysis for many years. By coupling the effluent of thermogravimetry to an infrared gas cell, TG/IR (sometimes known as evolved gas analysis) has been used to examine the thermally induced decomposition products a variety of polymers including of poly(vinyl chloride) (7), polyacrylamide (2), tetrafluoroethylene-propylene (3) and ethylene-vinyl acetate (4) copolymers, as well as styrene-butadiene composite (5). 

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