Degradation process of low molar mass poly(ethylene terephthalate)/organically modified montmorillonite nanocomposites

Lima, Juliana Aristéia de; Fitaroni, Lays B.; Chiaretti, Daniel; Kaneko, Manuela L. Q. A.; Cruz, Sandra Andréa

doi:10.1177/0892705715604678

Cited by 13 publications

(6 citation statements)

References 44 publications

(80 reference statements)

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“…After 343 min, an exothermic peak appears due to the oxidization of the material. It should be noted that a non‐stabilized polypropylene that shows an average of OIT of 5 min . A comparison between the OIT of the two materials is illustrated in Figure .…”

Section: Resultsmentioning

confidence: 99%

Thermal aging kinetic and effects on mechanical behavior of fully recycled composite based on polypropylene/polyethylene blend

Tamboura

Meftah

Fitoussi

et al. 2018

J of Applied Polymer Sci

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The effect of thermal oxidation of a fully recycled carbon fibers reinforced stabilized polypropylene/polyethylene blend on the mechanical properties has been studied at 120, 130 and 140 °C. In a first step, several analyses by FTIR and UV spectrometry and differential scanning calorimetry were performed in order to detect and monitor the evolution of the antioxidants and oxidation products in the materials. This approach aims to well understand and identify the aging mechanisms that will be modeled in a second step in a kinetic model capable of predicting the evolution of carbonyl build‐up while taking into account the presence of the different antioxidants. Modeling results showed a good correlation between the kinetic behavior and the obtained experimental data. Furthermore, the effect of thermal aging on the mechanical behaviors of the composite and the matrix were studied at the macroscopic scale at different strain rates. It has been shown that the thermal oxidation affects only the elongation at break. The numerical values of the oxidation products generated by the kinetic model allowed linking the evolution of the mechanical behavior under aging with the physicochemical state of the material. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46640.

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Section: Resultsmentioning

confidence: 99%

Thermal aging kinetic and effects on mechanical behavior of fully recycled composite based on polypropylene/polyethylene blend

Tamboura

Meftah

Fitoussi

et al. 2018

J of Applied Polymer Sci

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“…At these temperatures occur decomposition reactions of alkyl ammonium salts by Hoffmann elimination reaction. As described by Lima and co-workers [25] in a study about MMT incorporated in low molar mass PET, the elimination occurs by the extraction of a hydrogen atom from C-tallow structure of the salt quaternary ammonium. As a result, there is an olefinic and a tertiary amine groups, as described in Fig.…”

Section: Characterization Of Pristine and Modified Mmtmentioning

confidence: 95%

Short alkyl chain length ionic liquid as organic modifier in polypropylene/clay nanocomposite: a thermal comparative study

et al. 2021

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The most common polymeric nanocomposites are constituted of organically-modified clays. Generally, these organic modifiers are based on quaternary ammonium salts. These systems have as disadvantage the low thermal resistance of its modifiers under processing. Ionic liquids (IL) with different molecular structures can be used as organic modifier in lamellar clays-based polymeric nanocomposites, being promising not only to increase interactions between the nanoclay and the matrix, but also to increase the thermal resistance. In this study, polypropylene-based/montmorillonite nanocomposites were compared from two different organic modifiers. The use of short alkyl chain length imidazolium-based IL as montmorillonite modifier was investigated in terms of the thermal stability when compared to the usual quaternary ammonium salt surfactant. Integral procedure decomposition temperature was employed to determine the effect of these two different organoclay modifiers in PP-nanocomposites. The activation energy for these samples was calculated using Flynn–Wall–Ozawa (FWO) method. It was also used the multiple linear regression analysis to calculate the activation energy in order to evaluate the accuracy of this method when applied to nanocomposites. Article Highlights Short length alkyl group in ionic liquid was able to improve the thermal stability of PP-based nanocomposite. IPDT methodology is more realistic to evaluate the thermal stability of ionic liquid-based nanocomposite. MLR methodology was efficient to assess the entropic contribution associated to polymer-clay interactions, inter-lamellae spaces and interface morphology.

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“…The higher increase in the viscosity, even with a low amount of filler, is only possible when particle-polymer interactions dominate and form a secondary network structure. This is named as percolation and is observed in nanocomposites with a high level of phase interactions [38]. The TGA curves of the nanocomposites with (PP:5:5) and without (PP:5) compatibilizing agent are shown in Fig.…”

Section: Effect Of the Compatibilizing Agentmentioning

confidence: 99%

Effect of compatibilizer and Irganox MD 1024 on the thermo-oxidative stability of PP/PP-g-MA/OMMT nanocomposites

et al. 2016

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a b s t r a c tThe thermo-oxidative stability of polymeric materials reinforced with mineral fillers, such as clays, may be lower than that of pristine polymers, due to the presence of metallic ions and compatibilizing agents. In this paper, an effort was made to understand the influence that a compatibilizing agent and a metal deactivator bonded to a primary stabilizer has on the thermal stability of polypropylene/polypropylenegrafted maleic anhydride/organic montmorillonite (PP/PP-g-MA/OMMT) nanocomposites. At the first stage of this work, the organically modified montmorillonite clay is chemically analyzed by Inductively Coupled Plasma Atomic Emission Spectrometry to quantify the metals present in the clay. TGA, DSC, OIT, and dynamic OIT were used to assess the degradation of the nanocomposites. The results showed that the use of compatibilizing agents has a positive effect on the stability of nanocomposites in the initial steps of degradation, but has a degradative effect at higher temperatures, as indicated by the decreasing T max for compatibilized nanocomposites. In relation to Irganox MD 1024, an increase in all the parameters for assessing the stability of nanocomposites was observed; however, the most significant change was the delay in the temperature at which the occurrence of exothermal reactions begins. Use of this additive is responsible for delaying the beginning of the exothermic reaction until a higher temperature, as a function of its concentration, as well the differences between the beginning of volatile release and the exothermal reactions. Also was discussed the influence of Irganox MD1024 concentration on T max , and the difference of temperature between the beginning of heat releasing and the initial weight loss, which decreases as the stabilizer concentration is increased. Thanks to the association of dynamic OIT and TGA results from experiments performed with identical conditions. This complementary use of these techniques is a powerful tool for assessing the stability in the polymeric system.

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Degradation process of low molar mass poly(ethylene terephthalate)/organically modified montmorillonite nanocomposites

Cited by 13 publications

References 44 publications

Thermal aging kinetic and effects on mechanical behavior of fully recycled composite based on polypropylene/polyethylene blend

Thermal aging kinetic and effects on mechanical behavior of fully recycled composite based on polypropylene/polyethylene blend

Short alkyl chain length ionic liquid as organic modifier in polypropylene/clay nanocomposite: a thermal comparative study

Effect of compatibilizer and Irganox MD 1024 on the thermo-oxidative stability of PP/PP-g-MA/OMMT nanocomposites

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