By Serban C. Moldoveanu
Analytical Pyrolysis of artificial natural Polymers is a follow-up to Analytical Pyrolysis of ordinary natural Polymers, that's quantity 20 of the sequence. the main target of the e-book is on functional purposes of analytical pyrolysis in artificial natural polymer id and characterization.
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The formation of two radicals in a scission reaction is also known as a homolysis. g. C"~-C--C--C ). These bonds are indicated as in 13-position and are in general weaker than other C-C or C-H bonds and significantly weaker than aromatic, double, or triple bonds. The scission of this type of sp 3 bond is known as 13-scission. The 13-scission can take place as a Thermal decomposition of polymers 37 random 13-scission or as an end chain 13-scission. Random 13-scissions may take place with the formation of one free radical chain plus one low molecular weight free radical different from the monomer or may consist of two free radical chains when the cleavage takes place in the middle of the polymeric chain, as shown below: , /OH 2 /OH2 / /CH2_ CH3 ....
Are typically measured using dedicated instruments. Tensile modulus, for example, is measured by stretching a strip of polymer of known dimensions, applying a specific tensile stress (~, and measuring the tensile strain s in sample length. g. g. 5) 30 Overview of organic synthetic macromolecules The tensile modulus E is not a constant when • varies, and it also depends on temperature T. For these reasons, curves showing the dependence of ~ vs. ~ at constant temperatures or of E vs. T are used for the understanding of polymer behavior under mechanical stress.
In some cases, an elimination also can occur at the cz-position with the formation of small molecules such as CH4, NH3, etc. 1). Thermal decomposition of polymers . "CH~ . . /CH2 .... ,,C---~-CH '" I(CH C-'-CH ItUld:~ \OH2 L, ~" I, ~~.
Analytical Pyrolysis Of Synthetic Organic Polymers by Serban C. Moldoveanu