Kinetics of thermal degradation and thermo-oxidative degradation of conductive styrene-butadiene rubber-carbon black composites

Mohanraj, G. T.; Vikram, T.; Shanmugharaj, Æ A. M.; Khastgir, Dipak; Chaki, T. K.

doi:10.1007/s10853-006-0065-0

Cited by 20 publications

(11 citation statements)

References 18 publications

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“…It allows for a direct fit of the model to the experimental data without any transformation [10]. An additional advantage lies in the fact that there are no limitations with respect to the complexity of the model; consequently, it is reliable for solving applied kinetic problems [68][69][70][71].…”

Section: Kinetic Parameters and Modellingmentioning

confidence: 99%

Isoconversional kinetic analysis applied to five phosphonium cation-based ionic liquids

et al. 2017

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Thermal degradation of five phosphonium cation-based ionic liquids ([P 66614 outperforming the other ones in both pyrolytic and oxidising conditions. Although the thermal degradation mechanism is affected by atmospheric conditions, the degradation trend remains practically constant. As the dynamic methodology usually overestimates the long-term thermal stability, an isoconversional methodology is better for predicting the long-term thermal stability of these ionic liquids in order to be used as base oil or additive in lubricants formulation. Finally, the model-free methodology can predict at lower costs the ILs performance in isothermal conditions. Highlights• Weakly coordinating anions provoke good thermal stability of ILs.• • Isoconversional methods are better than dynamic ones for long-term thermal studies.• Activation energy behavior at low conversions is related to a single reaction.• Model-free methodology can predict the ILs performance in isothermal conditions.

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Section: Kinetic Parameters and Modellingmentioning

confidence: 99%

Isoconversional kinetic analysis applied to five phosphonium cation-based ionic liquids

et al. 2017

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“…The improvement in thermal stability and E a in the composites can be attributed to the good dispersion of Kaol particles in the polymer matrix that restricts the easy diffusion of volatiles from the bulk . Results showed a decrease in E a values with increase in Kaol content (i.e., entries 3 and 4), which can be attributed to the restriction in the mobility of the polymer chains due to the formation of aggregates of the clay with the polymer chains, thus making the degradation process favored through surface oxidation …”

Section: Resultsmentioning

confidence: 97%

Thermal, mechanical, and water vapor barrier behavior of polypropylene composite containing modified kaolinite

Albach

Munaro

Santos

et al. 2017

J of Applied Polymer Sci

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Polypropylene composites containing modified kaolinite were prepared using melt processing and the morphological, thermal, mechanical and their water barrier properties were analyzed. To improve compatibility with polypropylene, kaolinite was modified with silane as a coupling agent. Characterization techniques (X-ray diffraction, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy) confirmed the effective grafting of these compounds on the surface and edges of the kaolinite with no functionalization on the inner surface. The differential scanning calorimetry and X-ray diffraction techniques demonstrated that the addition of grafted kaolinite affected the iPP crystallinity. The thermogravimetric analysis helped to determine the thermal stability of the composites, being this, dependent on the amount of kaolinite and silane. The stress-strain tests demonstrated an increase in Young's modulus and obtained a 70% reduction in water vapor permeation. These improvements were mainly related to the increased compatibility between the iPP/Kaol interfaces promoted by the silane.Kaol is a dioctahedral lamellar aluminosilicate with molecular formula Al 2 Si 2 O 5 (OH) 4 . 21 This 1:1 clay mineral is very stable, Additional Supporting Information may be found in the online version of this article.

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“…The unsaturation loss was rather important. It is fairly well known that polybutadiene is susceptible to oxygen attack even at room temperature and this reaction is accelerated by heat . During exposure of SBR to thermo‐oxidative ageing, a decrease of the bands at 960 and 910 cm −1 ( trans −1,4 and vinyl‐1,2 structures of the butadiene part) was observed.…”

Section: Resultsmentioning

confidence: 99%

Accelerated ageing of styrene-butadiene rubber nanocomposites stabilized by phenolic antioxidant

et al. 2013

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Organoclay‐reinforced styrene butadiene rubber (SBR) was subjected to accelerated thermo‐oxidative ageing and its physical properties were compared to the virgin material. The oxidative degradation was studied in absence and in presence of a phenolic antioxidant. Ageing test was conducted at 70°C for 7, 14, and 28 days. Then, mechanical and dynamomechanical properties were measured and related to chemical and morphological changes. The elongation at break of samples without antioxidant was found to decrease whereas the modulus and hardness of SBR and its nanocomposite increased with ageing time. Also, the storage modulus and the glass transition temperature increased monotonously with time. These results were attributed to main chain scission and crosslinks formation. The ageing mechanism, determined by infrared spectroscopy, was independent on the nanoclay presence. When the antioxidant was added, thermo‐oxidative stability markedly increased. The retention in the physical properties upon ageing 28 days suggests that the addition of 0.5–1 phr antioxidant was sufficient to provide stability of SBR nanocomposite with minimum loss in physical properties. Also, SEM images showed no signs of degradation; this demonstrates that the antioxidant protects the surface from oxidative degradation. Moreover, infrared spectroscopy suggests that nanoclay could protect the elastomer surface from deterioration. POLYM. COMPOS., 35:334–343, 2014. © 2013 Society of Plastics Engineers

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Kinetics of thermal degradation and thermo-oxidative degradation of conductive styrene-butadiene rubber-carbon black composites

Cited by 20 publications

References 18 publications

Isoconversional kinetic analysis applied to five phosphonium cation-based ionic liquids

Isoconversional kinetic analysis applied to five phosphonium cation-based ionic liquids

Thermal, mechanical, and water vapor barrier behavior of polypropylene composite containing modified kaolinite

Accelerated ageing of styrene-butadiene rubber nanocomposites stabilized by phenolic antioxidant

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