Thermogravimetric Analysis of Polymers

Ng, H.M.; Saidi, Norshahirah M.; Omar, Fatin Saiha; Ramesh, K.; Bashir, Shahid

doi:10.1002/0471440264.pst667

Cited by 81 publications

(54 citation statements)

References 27 publications

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“…Figure (b) illustrates the spectrum of P(VP‐ co ‐Vac), in which the peak at 1734 cm −1 was due to the CO stretching of poly(vinyl acetate) (PVAc) and the peak at 1660 cm −1 confirmed the presence of poly(vinyl pyrrolidone) (PVP). The peaks at 1233 and 1020 cm −1 expressed the presence of the CN stretching of PVP and C─O─C stretching vibrations of PVAc, respectively . Figure (c) shows the spectrum of NaI.…”

Section: Resultssupporting

confidence: 70%

Polyacrylonitrile–poly(1‐vinyl pyrrolidone‐co‐vinyl acetate) blend based gel polymer electrolytes incorporated with sodium iodide salt for dye‐sensitized solar cell applications

Saidi

Omar

et al. 2019

J of Applied Polymer Sci

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New gel polymer electrolytes (GPEs) were prepared via the blending of a polyacrylonitrile polymer and a poly(1‐vinyl pyrrolidone‐co‐vinyl acetate) copolymer. The sodium iodide (NaI) salt concentration was varied for each GPE sample. From ionic conductivity (σ) studies, we observed that the sample with a 40 wt % NaI salt content (N40) showed the highest σ of 3.54 × 10−3 ± 0.05 S/cm at room temperature, and all of the GPE samples obeyed Arrhenius behavior. The dielectric properties of the GPE samples were also analyzed to study the electrical polarization of the materials. The developed GPE samples were also characterized with X‐ray diffraction and Fourier transform infrared spectroscopy. We also then used the developed GPE samples for the fabrication of dye‐sensitized solar cells by sandwiching them between a photoanode and Pt counter electrode for photovoltaic studies. The highest photovoltaic performance was achieved by N40, with an efficiency of 3.04%. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47810.

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Section: Resultssupporting

confidence: 70%

Polyacrylonitrile–poly(1‐vinyl pyrrolidone‐co‐vinyl acetate) blend based gel polymer electrolytes incorporated with sodium iodide salt for dye‐sensitized solar cell applications

Saidi

Omar

et al. 2019

J of Applied Polymer Sci

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“…Thermogravimetric analysis (TGA) has proved to be a suitable technique to study the thermal stability of polymeric materials, and it is proposed to assess the thermal stability of candidate materials. The weight of a sample is measured as the temperature changes, and the measured changes are associated with decomposition and oxidation reactions as well as physical processes such as sublimation, vaporization, and desorption, which provide valuable information on materials selection [ 66 ].…”

Section: Resultsmentioning

confidence: 99%

Manufacturing and Application of 3D Printed Photo Fenton Reactors for Wastewater Treatment

Esfahani

Zandi

Travieso-Rodríguez

et al. 2021

IJERPH

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Additive manufacturing (AM) or 3D printing offers a new paradigm for designing and developing chemical reactors, in particular, prototypes. The use of 3D printers has been increasing, their performance has been improving, and their price has been reducing. While the general trend is clear, particular applications need to be assessed for their practicality. This study develops and follows a systematic approach to the prototyping of Advanced Oxidation Processes (AOP) reactors. Specifically, this work evaluates and discusses different printable materials in terms of mechanical and chemical resistance to photo-Fenton reactants. Metallic and ceramic materials are shown to be impracticable due to their high printing cost. Polymeric and composite materials are sieved according to criteria such as biodegradability, chemical, thermal, and mechanical resistance. Finally, 3D-printed prototypes are produced and tested in terms of leakage and resistance to the photo-Fenton reacting environment. Polylactic acid (PLA) and wood–PLA composite (Timberfill®) were selected, and lab-scale raceway pond reactors (RPR) were printed accordingly. They were next exposed to H2O2/Fe(II) solutions at pH = 3 ± 0.2 and UV radiation. After 48 h reaction tests, results revealed that the Timberfill® reactor produced higher Total Organic Carbon (TOC) concentrations (9.6 mg·L−1) than that obtained for the PLA reactor (5.5 mg·L−1) and Pyrex® reactor (5.2 mg·L−1), which suggests the interference of Timberfill® with the reaction. The work also considers and discusses further chemical and mechanical criteria that also favor PLA for 3D-printing Fenton and photo-Fenton reactors. Finally, the work also provides a detailed explanation of the printing parameters used and guidelines for preparing prototypes.

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“…The TGA analysis [2] shows that the reaction which involves in the decomposition is somehow similar to some degradation reaction. So the reaction is similar to main-chain scission and cross-linking [11].…”

Section: Effect Of Cnt On the Activation Energy Of The Pp/mwcnt Compamentioning

confidence: 88%

“…The hydroperoxide group, ROOH, is relatively stable, yet can slowly decompose. The decomposition of hydroperoxide can be described by several mechanisms [9,10,11]. In the most common mechanism, two adjacent hydroperoxides can decompose according to reaction refer to (4), below (corresponding to R.3 in table 2), which has lower activation energy than the unimolecular decomposition given by reaction refer to (5) [12].…”

Section: Propagationmentioning

confidence: 99%

Reaction Model to Predict the Thermal Degradation Mechanism of Polypropylene – Carbon Nanotube Composite

Alauddin

Khan

Ahmad

2020

IPR

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The degradation of polymer is known, but the effect of CNT composite is the less studied concept. In this article, the effect of CNT on degradation is presented. The first stage involved a literature study for reaction mechanisms in oxidative thermal degradation of Polypropylene (PP). A reaction model is then developed by considering mass balance on various reactive species. Literature is reviewed to find or estimate the model parameters. The parameters not found in the literature are fitted. The model equations are solved after assuming initial conditions and values of various parameters. After the PP polymer degradation modeling comparison drown between PP and PP/MWCNT composite by making a hypothesis based on Arrhenius equations (activation energy increases, the rate constant decreases, and therefore the rate of reaction decreases). The result shows that the CNT composite takes much time to degrade as compared to the polymer.

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Thermogravimetric Analysis of Polymers

Cited by 81 publications

References 27 publications

Polyacrylonitrile–poly(1‐vinyl pyrrolidone‐co‐vinyl acetate) blend based gel polymer electrolytes incorporated with sodium iodide salt for dye‐sensitized solar cell applications

Polyacrylonitrile–poly(1‐vinyl pyrrolidone‐co‐vinyl acetate) blend based gel polymer electrolytes incorporated with sodium iodide salt for dye‐sensitized solar cell applications

Manufacturing and Application of 3D Printed Photo Fenton Reactors for Wastewater Treatment

Reaction Model to Predict the Thermal Degradation Mechanism of Polypropylene – Carbon Nanotube Composite

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