Thermogravimetric kinetics of degradation of HDPE based MWCNTs reinforced composites

Rajeshwari, P.; Dey, T.K.

doi:10.1007/s12588-014-9076-x

Cited by 13 publications

(5 citation statements)

References 56 publications

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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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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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“…For this purpose the non‐isothermal TGA measurement was performed at the heating rates 2, 10, 20, and 30°C/min. The E a was then correlated to the reaction extent ( α ), evaluated as follows:

α = \frac{m_{0} - m}{m_{0} - m_{f}}

where m 0 , m , and m f are the initial, actual, and final masses of the samples, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…It is noted that the rate of decomposition ( dα / dt ) is described by Equations and

\frac{dα}{dt} = K ((), T) f ((), α)

f ((), α) = {(1 - α)}^{n}

where K ( T ) is the rate constant that depends on temperature, f ( α ) is the rate of conversion, which depends on the concentration of reactant and on the power index n .…”

Section: Resultsmentioning

confidence: 99%

Novel natural rubber composites based on silver nanoparticles and carbon nanotubes hybrid filler

et al. 2019

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Hybrid filler of carbon nanotubes (CNT) and silver nanoparticles (AgNP) was prepared and then mixed with natural rubber (NR) with CNT:AgNP ratio = 100:1. The AgNP was first synthesized by reacting silver nitrate with sodium citrate as a reducing agent in an aqueous solution. Then, the UV‐vis spectrometry and transmission emission microscopy were used to follow the reaction forming AgNP and the optimum reaction time was found at about 20 minutes. The latex mixing of NR and CNT‐AgNP hybrid filler was eventually performed. It was also found that the CNT‐AgNP hybrid filler enhanced various properties of the NR composites, including torque difference, storage modulus, and initial modulus (from temperature scanning stress relaxation test) as compared to the conventional NR‐CNT composite. Furthermore, higher electrical conductivity with comparatively low percolation threshold of the hybrid composites was found as compared to the NR‐CNT composite. This might be due to decoration of AgNP particles on CNT surfaces or between CNT bundles caused hindering CNT agglomeration and facilitating electron tunneling. Also, CNT network formation the NR hybrid composite was stronger than in the NR‐CNT composite. Furthermore, strong infinite CNT network formation increased thermal diffusion in the NR‐CNT/AgNP hybrid composite.

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“…There are different methods for non-isothermal degradation kinetic study of thermodiagrams. Following five methods are mostly used for obtaining degradation mechanisms and kinetics of polymers: Coats-Redfern method, Coats-Redfern (modified) method, Flynn-Wall-Ozawa method, Kissinger-Akahira-Sunose method, and Friedman method [55]. The model-free approaches are built on the Arrhenius parameters, with no dependance on the reaction order.…”

Section: Kissinger-akahira-sunose Methods -Kas Methodsmentioning

confidence: 99%

Influence of Natural Zeolites on the Thermal Decomposition of Multi-layered Plastic Waste

Djurdjevic,

Papuga,

Kremer

et al. 2024

Teh. glas. (Online)

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The pyrolysis process drove scientific attention lately, as it represents the basis for the production of second generation of synthetic fuels and other chemicals. The process takes place in inert atmosphere, and liquids, gases, and small number of solid particles represent main reaction products. Pyrolysis can be thermal or catalytic. Thermal pyrolysis requires very high temperatures, and products do not have high quality, while addition of catalysts reduces the reaction time, there is a better conversion rate, and lower operation temperature. In this paper, multi-layered plastic waste is used as raw material for thermogravimetric analysis (TGA). The composition of used plastic waste was previously determined based on the analysis of a large number of samples from fraction of mechanically non-recyclable plastic waste collected from waste treatment facilities in Croatia. Two natural zeolites with the most promising catalysts properties were selected for the reaction. Thermogravimetric analysis was used to understand the pyrolysis process of multi layered plastic waste and to determine the thermochemical behavior and kinetics. Kinetic analysis was performed using the isoconversional Kissinger-Akahira-Sunose method. The aim of this paper was to investigate how selected natural zeolite catalysts influence the kinetics of the pyrolysis process of multi-layered plastic waste.

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Thermogravimetric kinetics of degradation of HDPE based MWCNTs reinforced composites

Cited by 13 publications

References 56 publications

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

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

Novel natural rubber composites based on silver nanoparticles and carbon nanotubes hybrid filler

Influence of Natural Zeolites on the Thermal Decomposition of Multi-layered Plastic Waste

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