Dynamic thermal decomposition of blends of polyamide 6 with functionalized and non-functionalized PP

González, Jeanette; Albano, Carmen; Sciamanna, Rosalba; Ichazo, Miren; Rosales, Carmen; Martínez, José G.; Candal, Marı́a

doi:10.1016/s0141-3910(99)00160-3

Cited by 23 publications

(8 citation statements)

References 22 publications

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“…Kinetic parameters such as, activation energy, Ea, and pre‐exponential factor, A, for the thermal decomposition of PP and nanocomposites have been determined using Coats‐Redfern (CR) method . Other authors used successfully this method for the thermal degradation study of polymer systems .…”

Section: Resultsmentioning

confidence: 99%

Carbon nanofiber type and content dependence of the physical properties of carbon nanofiber reinforced polypropylene composites

et al. 2013

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The variation of the physical properties of four different carbon nanofibers (CNFs), based‐polymer nanocomposites incorporated in the same polypropylene (PP) matrix by twin‐screw extrusion process was investigated. Nanocomposites fabricated with CNFs with highly graphitic outer layer revealed electrical isolation‐to‐conducting behaviors as function of CNF's content. Nanocomposites fabricated with CNFs with an outer layer consisting on a disordered pyrolitically stripped layer, in contrast, revealed better mechanical performance and enhanced thermal stability. Further, CNF's incorporation into the polymer increased the thermal stability and the degree of crystallinity of the polymer, independently on the filler content and type. In addition, dispersion of the CNFs' clusters in PP was analyzed by transmitted light optical microscopy, and grayscale analysis (GSA). The results showed a correlation between the filler concentration and the variance, a parameter which measures quantitatively the dispersion, for all composites. This method indicated a value of 1.4 vol% above which large clusters of CNFs cannot be dispersed effectively and as a consequence only slight changes in mechanical performance are observed. Finally, this study establishes that for tailoring the physical properties of CNF based‐polymer nanocomposites, both adequate CNFs structure and content have to be chosen. POLYM. ENG. SCI., 54:117–128, 2014. © 2013 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Carbon nanofiber type and content dependence of the physical properties of carbon nanofiber reinforced polypropylene composites

et al. 2013

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“…20 Thermal analysis techniques include pyrolysis-mass spectrometry, scanning differential calorimetry (DSC) and thermogravimetry analysis (TGA). Polyamide and its blends, such as PA6 and PA66, 21 PA6-polypropylene blends 22 and PA6/EPDM 15 blends have been similarly analyzed. However, chitosan blended with PA6 (chitosan/PA6) polymer blend exhibits deficient thermal degradation characteristics.…”

Section: Introductionmentioning

confidence: 99%

A kinetic study of thermal degradations of chitosan/polycaprolactam blends

2004

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We have used FT-IR spectra to explain the effects of hydrogen bonding between chitosan and polycaprolactam (PA6). A dynamic mechanical analysis study suggested that the optimum chitosan and PA6 miscibility under the conditions of this experiment were obtained at a blending ratio of 40:60. We studied the thermal degradation of chitosan blended with PA6 (chitosan/PA6) by thermogravimetric analysis and kinetic analysis (by the Ozawa method). Dry chitosan and PA6 exhibited a single stage of thermal degradation and chitosan/PA6 blends having >20 wt% PA6 exhibited at least two stages of degradation. In chitosan/PA6 blends, chitosan underwent the first stage of thermal degradation; the second stage proceeded at a temperature lower than that of PA6, because the decomposition product of chitosan accelerated the degradation of PA6. The activation energies of the blends were between 130 and 165 kJ/mol, which are also lower than that of PA6.

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“…In many cases the change of E or A with β is not monotonous. In spite of the last almost 20 years of observations, in recent papers [19][20][21][22][23] values of kinetic parameters obtained through the analysis of only one α = α(T ) curve, recorded at a given heating rate, are reported.…”

Section: Introductionmentioning

confidence: 99%

Some methodological problems concerning nonisothermal kinetic analysis of heterogeneous solid–gas reactions

Budrugeac

Segal

2001

Int J of Chemical Kinetics

140

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Isoconversional methods, those using only one curve α = α(T ) (α is the conversion degree and T is the temperature), and invariant kinetic parameter method were applied to estimate the kinetic parameters from the following nonisothermal data: (1) simulated TG curves for a single reaction; (2) TG curves for thermal degradation of PVC; and (3) TG curves for the dehydration of CaC 2 O 4 ·H 2 O. The results obtained by applying various methods for the same system are compared and discussed. Finally, a procedure of kinetic analysis is suggested. Its application could lead to kinetic parameter values that can be used to predict either α = α(t) curves for other heating rates or α = α(T ) curves for isothermal conditions.

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Dynamic thermal decomposition of blends of polyamide 6 with functionalized and non-functionalized PP

Cited by 23 publications

References 22 publications

Carbon nanofiber type and content dependence of the physical properties of carbon nanofiber reinforced polypropylene composites

Carbon nanofiber type and content dependence of the physical properties of carbon nanofiber reinforced polypropylene composites

A kinetic study of thermal degradations of chitosan/polycaprolactam blends

Some methodological problems concerning nonisothermal kinetic analysis of heterogeneous solid–gas reactions

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