Synthesis and Thermal Properties of Polyimide/BaZrO<sub>3</sub>Novel Nanocomposites

Enhessari, Morteza; Shaterian, Maryam; Ozaee, Keyvan; Karamali, E.

doi:10.1080/03602559.2011.625380

Cited by 16 publications

(5 citation statements)

References 21 publications

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“…Synthesis of La 2 Ce 2 O 7 nanoparticles.-A method for synthesizing La 2 Ce 2 O 7 nanoparticles is disclosed: 28 Firstly, ammonium cerium (IV) nitrate ((NH 4 ) 2 Ce(NO 3 ) 6 ) and n-butanol (C 4 H 10 O) are reacted to synthesize cerium-n-butoxide (Ce(OBu) 4 ). Next, the cerium-n-butoxide, latanium acetate (La(CH 3 COO) 2 ), and stearic acid (C 18 H 36 O 2 ) are reacted to form a homogenous product including the La 2 Ce 2 O 7 nanoparticles.…”

Section: Methodsmentioning

confidence: 99%

Effect of La₂Ce₂O₇on the Physicochemical Properties of Phosphoric Acid Doped Polybenzimidazole Nanocomposite Membranes for High Temperature Proton Exchange Membrane Fuel Cells Applications

Shabanikia

Javanbakht

Amoli

et al. 2014

J. Electrochem. Soc.

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In this study, polybenzimidazole (PBI)/La 2 Ce 2 O 7 nanocomposite membranes (PLCs) based on various amounts of nano-sized La 2 Ce 2 O 7 were synthesized and have been investigated with a view to developing a novel electrolyte for high temperature proton exchange membrane fuel cells. The PLCs as novel proton conducting membranes have been prepared by dispersion of nano-sized La 2 Ce 2 O 7 into a polybenzimidazole membrane with solution casting method and characterized by a thermal analysis and structural view. The nanocomposite membranes were also studied using AC impedance spectroscopy (IS) and scanning electron microscopy (SEM) coupled with energy dispersive X-ray (EDX). The highest phosphoric acid uptake (153%) and proton conductivity (0.093 S/cm at 180 • C in dry condition) were observed for the PBI nanocomposite membranes containing 4 wt% of La 2 Ce 2 O 7 nanoparticles. The polarization and power curves for the membrane were also studied at 100, 150 and 180 • C. The PLC showed 0.43 W/cm 2 power density and 0.85 A/cm 2 current density in 0.5 V at 180 • C in dry condition. The results obtained from our studies showed the enhanced physicochemical properties of the novel nanocomposites for high temperature proton exchange membrane fuel cells.Proton exchange membrane fuel cells (PEMFCs) are electrochemical devices that continuously convert chemical energy into electric energy (and some heat) for a variety of application. The development of high performance proton exchange membranes (PEMs) has been a challenge for PEMFC technology. Nafion is the best known membrane material used in PEMFCs. 1-3 In spite of its good qualities, low conductivity and poor performance under low humidification and at elevated temperatures are its major drawbacks. Thus, it is essential to develop new polymer electrolytes for high temperature fuel cells. 4-7 Organic-inorganic nanocomposite membranes have been widely studied for a long time. Organic-inorganic nanocomposites are commonly organic membrane composites with inorganic nanoscale construction blocks. They combine the benefits of the inorganic material and the organic membrane. Inorganic material provides high mechanical and thermal stability, while organic sections provide flexibility and multifunctional reactivity. Unique properties can be attained for nanocomposite materials. Moreover, due to synergetic effects, the hybrid may exhibit excellent characteristics in comparison to the properties of either component in isolation. [8][9][10] Organic-inorganic nanocomposite materials have been extensively used for the preparation of PEMs. [11][12][13] Polybenzimidazole (PBI) is a high performance aromatic heterocyclic polymer and advantageous candidate for the application in HT-PEMFCs because of its outstanding thermal and mechanical stability. PBI is an electronic and ionic insulator, but shows good ionic conductivity after doping with acids. Its doping with phosphoric acid is interesting for high PEMFC performance, due to its increased conductivity. 14-17 Different methods are being e...

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Section: Methodsmentioning

confidence: 99%

Effect of La₂Ce₂O₇on the Physicochemical Properties of Phosphoric Acid Doped Polybenzimidazole Nanocomposite Membranes for High Temperature Proton Exchange Membrane Fuel Cells Applications

Shabanikia

Javanbakht

Amoli

et al. 2014

J. Electrochem. Soc.

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“…Another way of improving the mechanical, thermal, and chemical properties and resistance to hostile environments is by making their composites materials [15,16] . This aim can be achieved by dispersion of inorganic nanoparticles into a polymer matrix, which has been proved to be effective in the improvement of the performances of the organic polymers by yielding so-called organic-inorganic nanocomposites [17] .…”

Section: Introductionmentioning

confidence: 99%

“…These nanocomposites are well-off enough among the today's materials scientists since their unique combinational properties from organic and inorganic materials that could not be obtained by a single component [17] . So far, most of the researches reported in the literature on clay nanocomposites of poly(amide-imide) have focused on platelet-like clays, such as montmorillonite (MMT) [18][19][20] .…”

Section: Introductionmentioning

confidence: 99%

Novel Sepiolite-based Poly(Amide-imide) Nanocomposites: Preparation and Properties

Abbasi

Mehdipour‐Ataei

2014

Polymer-Plastics Technology and Engineering

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Novel sepiolite-based poly(amide-imide) nanocomposites were prepared by in-situ polymerization via polycondensation of a diamine containing amide groups with hexafluoropropane dianhydride. The process involved dispersion of sepiolite in poly(amic acid) solution followed by thermal imidization to get ultimate nanocomposites. The morphology, thermal and mechanical performances of nanocomposites with various sepiolite contents were studied. Nanoparticles were homogenously dispersed throughout the matrix with 50-65 nm size range. Due to such dispersion, poly(amide-imide)-sepiolite nanocomposite films exhibited improvements on the thermal-mechanical properties. The best results arose from favorable miscibility between polymer and sepiolite in the nanocomposites when 3 wt.% nanoparticles were introduced into poly(amide-imide) matrix.

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“…Aromatic polyimides [1][2][3][4][5] are widely used in aerospace, automobile, electronics, and other high technology fields due to their excellent thermal, mechanical properties, and stability to radiation and chemical reagents. [6][7][8] The polyimides have rigid molecular chains, resulting in poor solubility in common organic solvents and this inevitably affects their synthesis, processing, and application.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of new unsymmetrical diamine monomer and polyimides

Thiruvasagam

2013

Designed Monomers and Polymers

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A novel unsymmetrical monomer 5-(4-aminophenoxy)naphthalene-1-amine was prepared from 5-amino1-naphthol and 4-nitrofluorobenzene by the nucleophilic substitution reaction followed by reduction using 'Sn' and HCl. The structure of the monomer was confirmed by FT-IR and 1 H-NMR. A series of aromatic polyimides were successfully prepared from this diamine and aromatic dianhydrides through high temperature solution imidization technique. The polyimides were fully characterized by viscosity measurements, solubility test, FT-IR and 1 H-NMR spectroscopy, X-ray diffraction, differential scanning calorimetry, and thermogravimetry. The X-ray diffraction patterns indicated that all these polyimides were amorphous. The polyimides exhibited good solubility in organic solvents. The glass transition temperature values were observed in the temperature range 210-287°C. Thermogravimetric analysis indicated that 10% weight loss occurred in the temperature range 385-463°C.

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Synthesis and Thermal Properties of Polyimide/BaZrO₃Novel Nanocomposites

Cited by 16 publications

References 21 publications

Effect of La₂Ce₂O₇on the Physicochemical Properties of Phosphoric Acid Doped Polybenzimidazole Nanocomposite Membranes for High Temperature Proton Exchange Membrane Fuel Cells Applications

Effect of La₂Ce₂O₇on the Physicochemical Properties of Phosphoric Acid Doped Polybenzimidazole Nanocomposite Membranes for High Temperature Proton Exchange Membrane Fuel Cells Applications

Novel Sepiolite-based Poly(Amide-imide) Nanocomposites: Preparation and Properties

Synthesis and characterization of new unsymmetrical diamine monomer and polyimides

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Synthesis and Thermal Properties of Polyimide/BaZrO3Novel Nanocomposites

Cited by 16 publications

References 21 publications

Effect of La2Ce2O7on the Physicochemical Properties of Phosphoric Acid Doped Polybenzimidazole Nanocomposite Membranes for High Temperature Proton Exchange Membrane Fuel Cells Applications

Effect of La2Ce2O7on the Physicochemical Properties of Phosphoric Acid Doped Polybenzimidazole Nanocomposite Membranes for High Temperature Proton Exchange Membrane Fuel Cells Applications

Novel Sepiolite-based Poly(Amide-imide) Nanocomposites: Preparation and Properties

Synthesis and characterization of new unsymmetrical diamine monomer and polyimides

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Synthesis and Thermal Properties of Polyimide/BaZrO₃Novel Nanocomposites

Effect of La₂Ce₂O₇on the Physicochemical Properties of Phosphoric Acid Doped Polybenzimidazole Nanocomposite Membranes for High Temperature Proton Exchange Membrane Fuel Cells Applications

Effect of La₂Ce₂O₇on the Physicochemical Properties of Phosphoric Acid Doped Polybenzimidazole Nanocomposite Membranes for High Temperature Proton Exchange Membrane Fuel Cells Applications