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Influences of catalysis and dispersion of organically modified montmorillonite on flame retardancy of polypropylene nanocomposites
Author(s) -
Song Rongjun,
Wang Zhe,
Meng Xiaoyu,
Zhang Baoyan,
Tang Tao
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.27033
Subject(s) - montmorillonite , cone calorimeter , polypropylene , char , materials science , nanocomposite , chemical engineering , cationic polymerization , polymer chemistry , catalysis , thermal decomposition , pyrolysis , chemistry , composite material , organic chemistry , engineering
The degradation and flame retardancy of polypropylene/organically modified montmorillonite (PP/OMMT) nanocomposite were studied by means of gas chromatography‐mass spectrometry and cone calorimeter. The catalysis of hydrogen proton containing montmorillonite (H‐MMT) derived from thermal decomposition of (alkyl) ammonium in the OMMT on degradation of PP strongly influence carbonization behavior of PP and then flame retardancy. Brønsted acid sites on the H‐MMT could catalyze degradation reaction of PP via cationic mechanism, which leads to the formation of char during combustion of PP via hydride transfer reaction. A continuous carbonaceous MMT‐rich char on the surface of the burned residues, which work as a protective barrier to heat and mass transfer, results from the homogeneous dispersion of OMMT in the PP matrix and appropriate char produced. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007