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Thermal degradation behavior of styrene‐butadiene‐styrene tri‐block copolymer/multiwalled carbon nanotubes composites
Author(s) -
Lu Lan,
Yu Haiyang,
Wang Shifeng,
Zhang Yong
Publication year - 2009
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.29414
Subject(s) - materials science , thermogravimetric analysis , copolymer , fourier transform infrared spectroscopy , styrene , composite material , styrene butadiene , carbon nanotube , dispersion (optics) , composite number , degradation (telecommunications) , polymer chemistry , chemical engineering , polymer , telecommunications , physics , optics , computer science , engineering
The thermal degradation behavior of styrene‐butadiene‐styrene triblock copolymer (SBS) and SBS/multiwalled carbon nanotubes (MWCNTs) composites prepared by solution processing and melt mixing, respectively, was investigated using nonisothermal thermogravimetric analysis (TGA). The kinetic parameters of the activation energy ( E a ) for degradation, preexponential factor A , and the reaction order ( n ) were evaluated by the Flynn‐Wall‐Ozawa, Kissinger, and Coats‐Redfern methods, respectively. E a increased and n decreased after the incorporation of 3 wt % of MWCNTs into the SBS. The E a of SBS/MWCNTs composite prepared by melt mixing was higher than that by solution processing, which was attributed to the good dispersion of MWCNTs in SBS and the interactions between MWCNTs and SBS. The gases evolved during thermal degradation at a nitrogen atmosphere were studied by Fourier transform infrared spectroscopy (FTIR) coupled with the TGA. Aliphatic and aromatic CH peaks appeared simultaneously in FTIR spectra, indicating the thermal degradation of SBS proceeds by a random chain scission process. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009