Journal
POLYMER DEGRADATION AND STABILITY
Volume 95, Issue 5, Pages 859-869Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2010.01.009
Keywords
Nanocomposites; Morphology; Thermal degradation; Thermo-oxidative degradation; Charred residue
Categories
Funding
- Iranian Nanotechnology Initiative
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In this study, morphological properties of polypropylene (PP)/ethylene vinyl acetate copolymer (EVA) (75/25 wt/wt) blend-based nanocomposites containing various amounts of organically modified montmorillonite (OMMT) were primarily investigated. The incorporation of compatibilizer into nanocomposites decreased EVA droplet size in PP matrix while increasing compatibilizer/OMMT ratio showed a dual behavior with respect to the variations of OMMT interlayer spacing. By a rough estimation it was found that at EVA droplet size of D-n = 0.43 mu m, the highest OMMT interlayer spacing would be acheived. Increasing D-n had a negative effect on the OMMT interlayer spacing. Activation energy of thermal/thermo-oxidative degradation based on Flynn model was obtained. Isothermal degradation test was also performed and desired temperature range for predicting degradation behavior was obtained by means of a free prediction model. An attempt was made to establish a correlation between morphological and thermal/thermo-oxidative parameters and also charred residue morphology. A mechanism for degradation process was proposed according to the changes of chemical bonds during the degradation process probed by FTIR analysis. (C) 2010 Elsevier Ltd. All rights reserved.
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