Kinetic analysis of thermal degradation of poly(ethylene glycol) and poly(ethylene oxide)s of different molecular weight

Vrandečić, Nataša Stipanelov; Erceg, Matko; Klarić, Ivka

doi:10.1016/j.tca.2009.10.005

Cited by 175 publications

(108 citation statements)

References 22 publications

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“…The neat PEO3 also shows one glass transition temperature that is identical to that of neat PEO1 (Tables 2 and 3). This fact proves that the increase in PEO molecular weight does not influence the glass transition temperature, which is in accordance with the conclusions made by Vrandečić et al 33 The temperatures of melting and crystallization of neat PEO3 are slightly different than those of neat PEO1, while corresponding enthalpies show lower values (Tables 2 and 3).…”

Section: Differential Scanning Calorimetrysupporting

confidence: 91%

Miscibility of Poly(Vinyl Chloride) with Poly(Ethylene Oxide) of Different Molecular Weights

Stipanelov¹

2016

Chem.Biochem.Eng.Q.

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In this work, five different techniques: dilute solution viscometry, differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), Fourier transform infrared spectroscopy (FT-IR), and scanning electronic microscopy (SEM) were employed in order to evaluate interactions of amorphous poly(vinyl chloride) (PVC) and semi-crystalline poly(ethylene oxide) (PEO) in solution and solid state. The results varied significantly from one experimental technique to another. The positive interactions between the investigated polymers were found over the whole composition range only in solution. However, in the solid state, by DSC and DMA analysis, the positive interactions were found only at elevated PVC content, while FT-IR and SEM analysis could not confirm interactions between the investigated polymers.

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Section: Differential Scanning Calorimetrysupporting

confidence: 91%

Miscibility of Poly(Vinyl Chloride) with Poly(Ethylene Oxide) of Different Molecular Weights

Stipanelov¹

2016

Chem.Biochem.Eng.Q.

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“…PEO is currently also used in the pharmaceutical industry for applications such as controlled-release, solid-dose matrix systems, transdermal drug delivery systems and mucosal bioadhesives [23]. PEO is also a very suitable material for hot melt extrusion due to its very good processing ability in different processing conditions, where polymer of low molecular weight can act as a plasticizer for high molecular weight polymer [24]. (PEO)/clay nanocomposites offer new promising materials which display a great potential for use in various application fields [25][26].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Surfactant-Modified Powder Activated Carbon (SM-PAC) Reinforced Poly (Ethylene Oxide) (PEO) Composites

2016

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Poly (ethylene oxide), PEO, which was used for a wide variety of applications is a flexible, crystalline, thermoplastic, water-soluble and non-ionic polymer. The most of studies on surfactant-modified activated carbon (SM-PAC) have been generally focused on the removal of contaminants. This study aims the preparation of PEO/(SM-PAC) composites, using solution-intercalation method. Firstly activated carbon was modified with cationic surfactant, Cetyltrimethylammonium Bromide (CTAB). Then PEO/(SM-PAC) composites were prepared using solution-intercalation method, with two different (SM-PAC) contents (1.0 and 2.0 wt.%). The characterization of the composites was made by X-ray diffraction (XRD), Fourier Infrared Spectroscopy (FT-IR), thermal analysis and tensile tests. The XRD patterns revealed that 2θ positions of the broad peaks belonging to the composites significantly shift to left compared with those of virgin PEO. The SEM images of the surfactant-modified powdered activated carbon (SM-PAC)/PEO composites prepared with the two different SM-PAC contents show that there is an intensive interaction between the CTA + ions of modified activated carbon surface and the polymer chains. From the tensile tests, it was found that the unmodified powdered activated carbon dispersed into the polymer matrix made the ductile polymer more brittle. However, the tensile and yield strengths of the composite, prepared with modified powdered activated carbon, have decreased, and the strain percent value has significantly increased.

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“…The aforementioned E a value 150 kJ Á mol À1 for PG is within 10% error of the mean activation energy for the first 40% of degradation of PEG. However, according Vrandecic et al [30] the isoconversional activation energies do not practically depend on conversion but decrease with decreasing M w of PEG being around 120 kJ Á mol À1 for M w ¼ 3 400. While smaller, this value is within 20% error for that for PG.…”

Section: Kinetic Analysismentioning

confidence: 93%

Non‐oxidative Thermal Degradation of Poly(glycidol), Poly(glycidol)‐g‐L‐lactide, and Poly(glycidol)‐g‐glycolide

Atkinson¹,

Vyazovkin²

2011

Macro Chemistry & Physics

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Three polymers of pharmaceutical/medical relevance are synthesized: poly(glycidol) (PG), poly(glycidol)‐g‐L‐lactide (PG‐g‐La), and poly(glycidol)‐g‐glycolide (PG‐g‐Gly). Because the thermal stability of these polymers is an essential factor of their processing and practical application, the study focuses on kinetic and mechanistic aspects of non‐oxidative thermal degradation. The study is conducted by combining thermogravimetry, Fourier transform infrared spectroscopy, and isoconversional kinetic analysis. It is found that PG degrades in a single mass loss step, whereas, PG‐g‐La and PG‐g‐Gly in two. It is demonstrated that the first step in degradation of PG‐g‐La and PG‐g‐Gly is associated with decomposition of the pendant groups and the second is due to degradation of the PG backbone.magnified image

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Kinetic analysis of thermal degradation of poly(ethylene glycol) and poly(ethylene oxide)s of different molecular weight

Cited by 175 publications

References 22 publications

Miscibility of Poly(Vinyl Chloride) with Poly(Ethylene Oxide) of Different Molecular Weights

Miscibility of Poly(Vinyl Chloride) with Poly(Ethylene Oxide) of Different Molecular Weights

Preparation and Characterization of Surfactant-Modified Powder Activated Carbon (SM-PAC) Reinforced Poly (Ethylene Oxide) (PEO) Composites

Non‐oxidative Thermal Degradation of Poly(glycidol), Poly(glycidol)‐g‐L‐lactide, and Poly(glycidol)‐g‐glycolide

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