Thermal decomposition products of polyethylene

Abstract

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A literature review of the chemical nature and toxicity of the decomposition products of polythylenes

“…4) with subsequent decompositions, and free radical termination by disproportionation (eq. 5) or by combination (eq. 6) [4][5][6].…”

“…R* + CH^= CH -CH^-R R* + R -CH^-R -> R -CH -R + RH 2 (4) I R -CH = CH^+ R R + R -R -CH = CH^+ RH (5) R + R -» R -R ( 6 ) R 0 + H^C -R R -CH^OH + R…”

“…For example, a systematic mass spectrometric (MS) investigation by Madorsky et al [4] found that a polyethylene (m.w. 20,000) pyrolyzed in vacuum at temperatures up to 450°C yielded 15 Tsuchiya and Sumi also proposed that the main volatile degradation products from a polyethylene were formed by a mechanism involving the intramolecular migration of free radicals [5]. When samples of a commercially available HOPE were decomposed at fixed temperatures ranging from 375°C to 425°C, twenty-six compounds consisting mainly of normal alkanes and normal 1-alkenes containing 1 to 6 carbon atoms were identified by gas chromatography (GC) ( These results agree reasonably with those of Madorsky [4] and other degradation studies cited by Tsuchiya and Sumi [5].…”

Phthalocyanine green aluminum pigment prepared by inorganic acid radical/radical polymerization for waterborne textile applications

“…Most solid polymeric materials experience both physical and chemical changes when heat is applied which usually results in undesirable changes to the properties of the material [31,32]. This often results in thermal degradation or even decomposition where the action of heat or elevated temperatures on a material causes a loss of physical, mechanical, or electrical properties or at worse generate harmful gases [32].…”

“…This often results in thermal degradation or even decomposition where the action of heat or elevated temperatures on a material causes a loss of physical, mechanical, or electrical properties or at worse generate harmful gases [32]. Figure 8 shows the thermal properties of polymer-encapsulated phthalocyanine green aluminum pigment (PGAP).…”