Thermal Decomposition Chemistry of Poly(vinyl (热解化学聚(乙烯基).pdf

Thermal Decomposition Chemistry of Poly(vinyl (热解化学聚(乙烯基).pdf

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Thermal Decomposition Chemistry of Poly(vinyl (热解化学聚(乙烯基)

IN: Fire and PoLymers II: Materials and Test for Hazard Prevention, American Chemical Society, ACS Symposium Series 599, August 21-26, 1994, Washington, DC —— ——. Chapter 11 Thermal Decomposition Chemistry of Poly(vinyl alcohol) Char Characterization and Reactions with Bismaleimides Jeffrey W. Gilmanl, David L. VanderHart2, and Takashi Kashiwagi’ lBuilding and Fire Research Laboratory and2Materials Science and Engineering Laboratoryj National Institute of Standards and Technology, Gaithersburg, MD 20899-0001 The fundamental condensed phase processes which lead to char formation during the fue-like pyrolysis of polyvinyl alcohol), PVA, and PVA-cent.aining maleimides were characterized using CPIMAS 13C NMR. In addition to evidence of the well known chain-stripping elimination of ElzO and the chain-scission reactions, which occur during the pyrolysis of pure PVA, evidence is presented in support of cyclization and radical reaction pathways responsible for the conversion of unsa ated carbons into aliphatic carbons. Two general mechani

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