Thermal decomposition behavior of poly(ethylene 2,6‐naphthalate)/silica nanocomposites

Abstract

Poly(ethylene 2,6-naphthalate) (PEN) nanocomposites reinforced with silica nanoparticles were prepared by direct melt compounding. Dynamic thermogravimetric analysis was conducted on the PEN/silica nanocomposites to clarify the effect of silica nanoparticle on the thermal decomposition behavior of the resultant nanocomposites. There is a significant dependence of thermal decomposition behavior for PEN/silica nanocomposites on the content of silica nanoparticles and heating rate. The variation of the activation energy for thermal decomposition reflected the improvement of the thermal stability of the PEN/silica nanocomposites. The unique characteristics of silica nanoparticles resulted in physical barrier effect against the thermal decomposition, leading to the enhancement of the thermal stability of the PEN/silica nanocomposites. The incorporation of silica nanoparticles into the PEN matrix increased the storage modulus of the PEN/silica nanocomposites and made it possible for them to sustain higher modulus at higher temperature relative to pure PEN. POLYM. COMPOS.a Values obtained from the DSC heating traces at 108C/min. b The crystallization temperature measured from the DSC cooling traces at 108C/min. c The degree of supercooling, DT ¼ T m 2 T c . FIG. 4. SEM image of the residues of PEN/silica 2.0 nanocomposite after thermal decomposition. FIG. 5. Dynamic mechanical properties of pure PEN and the PEN/ silica 1.0 nanocomposites as a function of temperature (open circles represent PEN and the solid circles represent PEN/silica nanocomposites).

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Effect of pellet size and compatibilization on thermal decomposition kinetic of recycled polyethylene terephthalate/recycled polypropylene blend

“…The heating rate was varied at 2, 5, 10, and 20 °C/min in nitrogen and air. The various thermograms were used to determine the temperature at certain weight losses from 2.5 to 50% in accordance to the isoconversion of FWO method1–6 that is based on the Arrhenius equation on the first order kinetic by where k ( T ) is rate of reaction, E a is activation energy (J/mol), A is the pre‐exponential factor, T is temperature (K), and R is a universal gas constant (8.314 J/mol K).…”

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