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Improvement of thermal and fire properties of polypropylene
Author(s) -
Goodarzi Vahabodin,
Monemian Seyed Ali,
Angaji Mahmood Torabi,
Motahari Siamak
Publication year - 2008
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.28892
Subject(s) - materials science , limiting oxygen index , ultimate tensile strength , polypropylene , thermal stability , thermogravimetry , composite material , thermogravimetric analysis , decabromodiphenyl ether , portlandite , fire retardant , chemical engineering , pyrolysis , char , portland cement , cement , engineering
Abstract In the present research, the thermal stability and fire properties of polypropylene (PP) have been improved through direct melt intercalation of PP, organically modified montmorillonite (OMMT), calcium carbonate (CaCO 3 ) nanoparticles, and conventional flame retardants, i.e., decabromodiphenyl oxide (DB) and antimony trioxide (AO). The morphology of the compound was characterized by means of X‐ray diffractometry and transmission electron microscopy. Thermogravimetry analysis (TGA), cone‐calorimetry, limiting oxygen index, UL‐94, and tensile tests were also employed to investigate thermal and mechanical properties as well as the flammability of the compounds. Data, obtained from TGA, indicated that simultaneous incorporation of both OMMT and CaCO 3 nanoparticles forms a synergistic effect to improve both the thermal and thermo‐oxidative stability. The kinetic analysis of polymer degradation showed that the presence of nanoparticles hindered the thermal degradation of PP. The combination of OMMT and CaCO 3 was more effective to improve fire properties than OMMT and DB/AO. The experimental results indicated that the incorporation of OMMT and CaCO 3 improved both the tensile (i.e., the increase of yield strength, tensile strength, and Young's modulus) and thermal properties. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008