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Thermo‐oxidative decomposition kinetics of elastomeric composites based on styrene‐(ethylene‐butylene)‐styrene triblock copolymer and organomontmorillonite
Author(s) -
Saikrasun Sunan,
Amornsakchai Taweechai
Publication year - 2011
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.33516
Subject(s) - materials science , maleic anhydride , composite material , nanocomposite , isothermal process , styrene , kinetics , copolymer , thermal stability , elastomer , thermal decomposition , thermoplastic elastomer , decomposition , polymer , chemical engineering , chemistry , thermodynamics , organic chemistry , physics , quantum mechanics , engineering
The elastomeric nanocomposites based on organomontmorillonite (OMMT) and styrene‐(ethylene‐butylene)‐styrene (SEBS) thermoplastic elastomer were prepared by melt processing using maleic anhydride grafted SEBS (SEBS‐ g ‐MA) as compatibilizer. Thermo‐oxidative decomposition behavior of the neat components and the nanocomposites were investigated using thermogravimertic analysis (TGA) in air atmosphere. The isoconversional method is employed to study the kinetics of thermo‐oxidative degradation. The heating modes and the composition of nanocomposites were found to affect the kinetic parameters ( E a , ln A and n ). The E a and ln A values of SEBS, OMMT, and their composites are much higher under dynamic heating than under isothermal heating. The reaction order ( n ) of OMMT was lower than those of SEBS and their composites. The obtained TG profiles and calculated kinetic parameters indicated that the incorporation of OMMT into SEBS significantly improved the thermal stability both under dynamic heating and under isothermal heating. The simultaneously obtained DSC data showed that the enthalpy of thermal decomposition decreased with OMMT loading. No significant change in the nonisothermal and isothermal stability of the nanocomposites with addition of SEBS‐ g ‐MA. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011