Invariant kinetic parameters of polymer thermolysis. IV. Influence of fire-retardant additives on polypropylene thermolysis

✍ Scribed by S. V. Vyazovkin; V. V. Bogdanova; I. A. Klimovtsova; A. I. Lesnikovich

• Publisher: John Wiley and Sons
• Year: 1992
• Tongue: English
• Weight: 303 KB
• Volume: 44
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1992.070441211

✦ Synopsis

Analyzing the transformation-degree dependence of the effective activation energy, we have studied the thermolysis gross kinetics of polypropylene ( PP ) -based fire-resisting composition and a synergetic mixture of fire-retardant additives: antimony oxide and hexabrominecyclododecane (HBCD). The addition to PP of individual HBCD and in a mixture with antimony oxide increases the activation energy at the initial stage of thermolysis, which is attributed to the ability of fire-retardant additives to impede destruction initiated by oxidation. The investigation of the process proceeding in PP prior to the onset of decomposition in the presence of fire-retardant additives has shown that these additives stimulated crosslinking of polymer chains. The addition to PP synergetic mixture gives the greatest-compared to its individual components-content of the crosslinked fraction ( 10% ) , whose presence is likely to inhibit the proceeding of thermolysis by the oxidation mechanism.