標題: Unveiling the thermal kinetics and scissoring mechanism of neolatry polyethylene/reduced graphite oxide nanocomposites
作者: Yee, Toh Guat
Lin, Ong Hui
Bindumadhavan, Kartick
Doong, Ruey-an
環境工程研究所
Institute of Environmental Engineering
關鍵字: Low density polyethylene;Reduced graphite oxide;Activation energy;TGA-GC-MS
公開日期: 1-一月-2017
摘要: The present study focuses on thermal degradation mechanism of low density polyethylene (LDPE)/reduced graphite oxide (rGO) nanocomposites prepared by solvent cast method with an implication of its kinetics modelling. Graphite oxide (GO) was reduced under solvothermal conditions, using sodium borohydride and 0.1, 1.0, 3.0 and 5.0 wt% of rGO was incorporated into LDPE. Thermogravimetric analysis (TGA) was used to determine the decomposition kinetics of the nanocomposites at different heating rates of 1, 5, 10 and 20 degrees C/min. The maximum activation energy (Ea) calculated using Kissinger (K) and Flynn-Wall-Ozawa (FWO) models were noted to be 321.80 and 335.01 kJ/mol respectively at nanocomposite with 3 wt% rGO content. Also, the correlation coefficient (r(2)) in FWO models was higher than 0.95, confirming a single-step decomposition in the nanocomposites. TGA coupled with gas chromatography (GC) and mass spectroscopy (MS) was employed to separate the evolved compounds into alkane, alkene and aromatic groups. Interestingly, pravastatin, a useful gaseous compound was detected at 370 degrees C and other toxic gases were evolved at degradation temperature similar to 460 degrees C and above. Our findings on kinetics behaviour and degradation mechanism emphasize on the thermal cracking characteristic of the LDPE/rGO nanocomposites, which can be utilized to extract useful gaseous components for pharmaceutical application. (C) 2017 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.jaap.2017.01.005
http://hdl.handle.net/11536/146039
ISSN: 0165-2370
DOI: 10.1016/j.jaap.2017.01.005
期刊: JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
Volume: 123
起始頁: 20
結束頁: 29
顯示於類別:期刊論文