Preparation and characterization of polyimide/Al<sub>2</sub>O<sub>3</sub> hybrid films by sol–gel process

Ma, P.; Nie, Wei; Yang, Zhenghua; Zhang, Peihong; Li, Gang; Liu, Qingquan; Gao, Lianxun; Ji, Xiangling; Ding, Mengxian

doi:10.1002/app.27540

Cited by 39 publications

(17 citation statements)

References 37 publications

(32 reference statements)

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“…Then PMDA was added to this solution with a certain time sequence, and the mixture was stirred mechanically again for 8 h to get a homogeneous PAA/Al 2 O 3 solution. 21,22 The PAA/Al 2 O 3 solution was casted onto the clear glass plate to form films that were then placed in a vacuum oven for 20 min to remove air bubbles. The films were then heated successively at 70, 120, 180, 240 and 300 o C for 1 h, respectively.…”

Section: Methodsmentioning

confidence: 99%

Preparation and Characterization of Polyimide/Alumina Composite Films as Improved Solid Dielectrics

Chen¹,

Zhu²,

Liu³

2016

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O 3 contents into PI which derived from pyromellitic dianhydride (PMDA) and a flexible diamine 4,4-bis(3-aminophenoxy)biphenyl (4,3-BAPOBP). The micromorphology, chemical structure, dielectric, mechanical properties and glass transition temperatures (T g) of prepared films were investigated by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), LCR metry, electronic tensile testing and differential scanning calorimetry (DSC). SEM images show uniform distribution of Al 2 O 3 nanoparticles in matrix. FTIR spectra indicate that Al 2 O 3 nanoparticles are functionalized with γ-aminopropyl triethoxysilane (γ-APS) and the imidization was complete. XRD patterns reveal the peaks of PI/Al 2 O 3 composite films were similar to those of Al 2 O 3 , indicating that the crystal structure of Al 2 O 3 remains unchanged and stable after being doped into PI matrix. Meanwhile, the effects of additives on the dielectric and mechanical properties of composite films were also studied. The results show the dielectric constant and dielectric loss of hybrid materials increase with the addition of Al 2 O 3 nanoparticles. The electrical breakdown strength and tensile strength of PI/Al 2 O 3 can be markedly improved by the addition of appropriate amounts of Al 2 O 3 to the PI matrix.

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Section: Methodsmentioning

confidence: 99%

Preparation and Characterization of Polyimide/Alumina Composite Films as Improved Solid Dielectrics

Chen¹,

Zhu²,

Liu³

2016

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“…Kapton type) are endowed with a high Young modulus and a high tensile strength; conversely such polyimide have low elongations at break values [21][22][23] (Table 1).…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Investigations of rubbery copolyimides for the preparation of asymmetric pervaporation membranes

El–Gendi

Roizard

Grignard

et al. 2010

Desalination and Water Treatment

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International audienceIt is known that membrane technologies may have a major role to play in the development of environmental-friendly processes, either in gas or liquid separations. In liquid separations, one of the challenging issues is to get membranes with suitable separation properties able also to survive to the exposure of liquid solvents at various temperatures. Aromatic polyimides are known to exhibit a very good stability to a great number of solvents, but their permeability are low because of their rigid carbon skeleton and of their low available free volume; so their uses are mainly limited to gas separations or to filtration processes (MF, UF). To broaden the application area of polyimides in liquid separations, we have prepared and studied the properties of a block ether aromatic copolyimide series where the ether soft block acts both as a selective and a permeable block; we describe attempts to get asymmetric polyetherimide (PEI) membranes having molecular separation properties using various experimental conditions of dry/wet phase inversion. The PEI physical properties and morphologies (SEM) are reported together with their pervaporation properties for water ethanol separation. The PV results showed that rubbery copolyimides can lead to promising asymmetric membranes for liquid liquid separations

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“…At the same time, the outstanding characteristics of PI, such as high thermal stability and high glass transition temperature contribute in keeping particles stable in nanometer size, rather than state of aggregation [1]. In recent years, more and more researches focus on bringing various inorganic components into polyimide matrix, preparing of polyimide/inorganic nano-particles hybrid films [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

The morphology and properties of polyimide composite films with Ag@Al₂O₃ nano-particles as fillers

Weng

Liu

Gao

et al. 2012

2012 7th International Forum on Strategic Technology (IFOST)

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Matal/oxide nanoparticles with a core-shell structure are of essential importance in theoretical sense and practical application in photocatalysis and dielectric materials. In this work, a novel core-shell structural Ag@Al 2 O 3 nanoparticle with aluminum oxide as the covering shell and silver as the inner core was respectively synthesized by one-step method and the modified Stöber method. The morphology and structure of the particles were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV-visible spectroscopy. All the results proved that the Ag@Al 2 O 3 nanoparticles had a typical core-shell structure, for Al 2 O 3 coated Ag particles and the sizes of Ag@Al 2 O 3 particles were all in nanometer level. However, the micrographs of the coated particles revealed that particles obtained in the one-step method distributed more uniformly and the size was smaller than that of the ones prepared via modified Stöber method. Then, the obtained Ag@Al 2 O 3 nano-particles were doped into the polyimide to fabricate the PI/Ag@Al 2 O 3 composite films via an in-situ polymerization process, in which the content of Ag@Al 2 O 3 nanoparticles was 8wt.%. The morphology, mechanical, thermal and dielectric properties of composite films were investigated. Results showed that the Ag@Al 2 O 3 nano-particles dispersed in polyimide matrix homogeneously with nanoscale. With the incorporation of Ag@Al 2 O 3 particles, the breakdown strength and the thermal stability of the resultant nano-composite films increased, while the mechanical properties decreased slightly.

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Preparation and characterization of polyimide/Al₂O₃ hybrid films by sol–gel process

Cited by 39 publications

References 37 publications

Preparation and Characterization of Polyimide/Alumina Composite Films as Improved Solid Dielectrics

Preparation and Characterization of Polyimide/Alumina Composite Films as Improved Solid Dielectrics

Investigations of rubbery copolyimides for the preparation of asymmetric pervaporation membranes

The morphology and properties of polyimide composite films with Ag@Al₂O₃ nano-particles as fillers

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Preparation and characterization of polyimide/Al2O3 hybrid films by sol–gel process

Cited by 39 publications

References 37 publications

Preparation and Characterization of Polyimide/Alumina Composite Films as Improved Solid Dielectrics

Preparation and Characterization of Polyimide/Alumina Composite Films as Improved Solid Dielectrics

Investigations of rubbery copolyimides for the preparation of asymmetric pervaporation membranes

The morphology and properties of polyimide composite films with Ag@Al2O3 nano-particles as fillers

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Product

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Preparation and characterization of polyimide/Al₂O₃ hybrid films by sol–gel process

The morphology and properties of polyimide composite films with Ag@Al₂O₃ nano-particles as fillers