Thermal degradation behaviour of PE/clay nanocomposites

Polymer nanocomposites based on organically modified clay (organoclay) and polyethylene (PE) were prepared by melt processing using poly(ethylene-co-vinyl acetate) (EVA) as compatibilizer. The degree of intercalation spacing was determined by X-ray diffraction (XRD). The thermal degradation behaviour was studied in thermogravimetry (TGA) and the chemical evolution in the solid residue was studied with an infrared microscope. During the thermal degradation of the nanocomposite in oxidant atmosphere the formation of a protective layer on the polymer surface was observed caused by a charring process of PE, which is normally a non-char-forming polymer. The protective effect of the char/clay layer against thermal oxidation was also observed by monitoring the retention of the long chain structure of PE.

[1]  G. Camino,et al.  Performance and mechanisms of fire retardants in polymers—A review , 1988 .

[2]  C. M. Liauw,et al.  Aspects of the thermal oxidation of ethylene vinyl acetate copolymer , 2000 .

[3]  Richard H. Harris,et al.  Flammability Properties of Polymer - Layered-Silicate Nanocomposites. Polypropylene and Polystyrene Nanocomposites , 2000 .

[4]  C. A. Wilkie,et al.  An XPS study of the thermal degradation and flame retardant mechanism of polystyrene-clay nanocomposites , 2002 .

[5]  Investigations of thermal elimination reactions of polymers by thermal volatilization analysis and ultraviolet spectroscopy , 1969 .

[6]  A. Chughtai,et al.  The surface structure and reactivity of black carbon , 1995 .

[7]  P. Dubois,et al.  Polymer-layered silicate nanocomposites: preparation, properties and uses of a new class of materials , 2000 .

[8]  Jeffrey W. Gilman,et al.  Flammability and thermal stability studies of polymer layered-silicate (clay) nanocomposites , 1999 .

[9]  R. E. Smallman,et al.  An assessment of high voltage electron microscopy (HVEM). An invited review , 1977 .

[10]  Marco Zanetti,et al.  Thermal behaviour of poly(propylene) layered silicate nanocomposites , 2001 .

[11]  T. Kashiwagi,et al.  Cone Calorimeter Combustion and Gasification Studies of Polymer Layered Silicate Nanocomposites. , 2002 .

[12]  C. A. Wilkie,et al.  Thermal stability and flame retardancy of poly(methyl methacrylate)-clay nanocomposites , 2002 .

[13]  Emmanuel P. Giannelis,et al.  Polymer Layered Silicate Nanocomposites , 1996 .

[14]  R. Mülhaupt,et al.  Synthesis and thermal behaviour of layered silicate-EVA nanocomposites , 2001 .

[15]  Marco Zanetti,et al.  Fire Retardant Halogen-Antimony-Clay Synergism in Polypropylene Layered Silicate Nanocomposites , 2002 .

[16]  V. Brunella,et al.  Char formation in polyvinyl polymers I. Polyvinyl acetate , 2002 .

[17]  C. A. Wilkie,et al.  Studies on the Mechanism by Which the Formation of Nanocomposites Enhances Thermal Stability , 2001 .

[18]  Edwin Metcalfe,et al.  Nanocomposite fire retardants — a review , 2000 .

[19]  Gerald Scott,et al.  Polymer Degradation and Stabilisation , 1988 .

[20]  M. Wu,et al.  Preparation and characteristics of nonflammable polyimide materials , 2000 .

[21]  S. Benson,et al.  Some unresolved problems in oxidation and combustion , 1979 .

[22]  I. C. Mcneill.  Developments in polymer degradation—3: Edited by N. Grassie. Applied Science Publishers Ltd, London, 321 pp., 1981. Price: £30·00 , 1982 .

[23]  M. Zanetti,et al.  Preparation and combustion behaviour of polymer/layered silicate nanocomposites based upon PE and EVA , 2004 .