Organic Chemistry

Download PDF by Serban C. Moldoveanu: Analytical Pyrolysis Of Synthetic Organic Polymers

By Serban C. Moldoveanu

Analytical Pyrolysis of man-made natural Polymers is a follow-up to Analytical Pyrolysis of traditional natural Polymers, that's quantity 20 of the sequence. the main target of the ebook is on useful functions of analytical pyrolysis in man made natural polymer id and characterization.

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The (~-scission is more frequent. It refers to the breaking of a (~ bond to an sp 2 carbon. For polystyrene for example, the o~-scission leads to the formation of a phenyl radical and a polymeric radical (and it is not a chain scission). Using the example of polypropylene, the o~-scission can occur only at the end of the polymeric chain and takes place as follows: CH3 "]CH3~' CH3 CH 3 ~ CH 3 A ,,, " H CH2 CH 3 ~C'%CH 2 The radical CH2=CH-CH2 ~ is more stable than the radical CH2=C'-CH3 formed in the above scission and a rearrangement probably takes place.

Some overlap still exists between analytical pyrolysis and other thermoanalytical techniques. For example, the analysis of thermal decomposition products can be done during other thermoanalytical measurements. g. [18]). A typical example is the analysis of the gases Overview of organic synthetic macromolecules 29 evolved during a chemical reaction as a function of temperature, known as EGA (evolved gas analysis). Pyrolytic reactions usually take place at temperatures higher than 250-300 o C, commonly between 5000 C and 800 ~ C.

Heat stabilizers include heavy metals salts such as basic lead carbonate, basic lead sulfate, dibasic lead phosphite (also acting as a light stabilizer), dibasic lead phthalate, stearates, ricinoleates, palmitates and octanoates of cadmium and barium, epoxide resins and oils, amines, diphenylurea, 2-phenylindole, aminocrotonates. The antioxidants include tris-nonyl phenyl phosphite, 2,6-di-tert-butyl-p-cresol (BHT), octadecyl-3,5-di-tert-butyl-4-hydroxyhydrocinnamate, etc. The UV stabilizers include modified benzophenones and benzotriazoles.

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Analytical Pyrolysis Of Synthetic Organic Polymers by Serban C. Moldoveanu


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