Preparation and characterization of polyimide/modified layered double hydroxide nanocomposites

Ahn, Jinhee; Han, Mijeong; Ha, Chang‐Sik

doi:10.1002/pi.2939

Cited by 9 publications

(11 citation statements)

References 24 publications

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“…To measure the tensile strength and modulus of the PI and PI/GO films, samples were cut into rectangular sheets with a dimension of 35 × 6 mm2 and were tested with a universal material testing machine (Testometric, M500‐25KN) at a speed of 20 mm/min. The data were obtained by taking the average values from three groups of tests.…”

Section: Methodsmentioning

confidence: 99%

“…Polyimide (PI) has been considered as one of the most important materials because of its excellent mechanical properties, striking thermal stability, and resistance to solvents and has been widely used in many applications including optics, aerospace, and microelectronics 1–3. Thus, the development in the past several years of novel PIs with improved properties has been of great interest, especially the high transparency, which has been one of the goals in many studies 4–7…”

Section: Introductionmentioning

confidence: 99%

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In situ preparation of transparent polyimide nanocomposite with a small load of graphene oxide

Shi

Guo

2012

J of Applied Polymer Sci

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Polyimide (PI) nanocomposites with 4,4 0 -bisphenol A dianhydride, 4,4 0 -oxydiphthalic anhydride, and diaminodiphenyl methane (MDA) as comonomers and functionalized with graphene oxide (GO), were prepared by in situ polymerization. Only a small amount of GO (0.03-0.12 wt %) is added to improve the mechanical properties of PI and to avoid a substantial decrease of PI transparence. The nanocomposites are characterized by FTIR, X-ray diffraction, thermogravimetric analysis, transmission electron microscope, tensile test, and UV-vis spectroscopy. It is demonstrated that the PI/GO composite films possess transmittance of above 80% at wavelengths of 500-800 nm when the GO content is under 0.12 wt %, while the stress intensity and Young's modulus are improved by 29 and 25%, respectively.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In situ preparation of transparent polyimide nanocomposite with a small load of graphene oxide

Shi

Guo

2012

J of Applied Polymer Sci

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“…5). 27,50 This behavior indicates that LDH-CA have great potential for polymer reinforcement. structures of LDH was changed ( Fig.…”

Section: Morphology Of Pi/ldh-ca Ncsmentioning

confidence: 95%

“…3,[20][21][22] Organically modified LDH have been dispersed in various polymers, such as polypropylene, 23 polystyrene, 24 poly (methyl methacrylate), 25 polylactide, 26 polyimide (PI), 27 poly(amide-imide) 28 and poly(ethylene glycol diacrylate). When certain organic anions are present in the interlayer space, the surface of LDHs can be rendered from hydrophilic to hydrophobic and as a result may be used to prepare polymer/LDH NCs.…”

mentioning

confidence: 99%

In situ thermal synthesis of novel polyimide nanocomposite films containing organo-modified layered double hydroxide: morphological, thermal and mechanical properties

2015

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An organic-inorganic hybrid compound constituted by a Zn/Al layered double hydroxide (LDH) intercalated with citric acid (LDH-CA), was dispersed in polyimides (PIs) with N-benzonitrile side group, through in situ polymerization. At first, 3-(bis(4-aminophenyl)amino)benzonitrile as a diamine monomer was synthesis and then it was reacted with 4,4′-benzophenone tetracarboxylicdianhydride via thermal imidization method to formed prossable PI. To improve the thermal and mechanical properties and also to avoid the aggregation of LDH particle in the polymer matrix, small amount of LDH-CA (1, 2, 4 wt %) was added to the synthesized PI. The resulted materials were characterized by Fourier transform-infrared spectroscopy, X-ray powder diffraction, thermogravimetry analysis (TGA), field emission-scanning electron microscopy, and transmission electron microscopy (TEM) techniques. TEM results showed that the LDH-CA nanolayers were dispersed in PI matrixes. The mechanical and thermal properties of the synthesized composites are effectively enhanced by the incorporation of 2wt.% LDH-CA in the polymer matrix. For the PI/LDH-CA nanocomposites, the maximum degree of tensile strength is observed at a LDH-CA loading of 2 wt%, corresponding to an almost 32% increase in tensile strength compared to the pure PI. IntroductionOrganic/inorganic hybrid materials have attracted widespread consideration owing to their potential uses as flame retardant materials, gene and drug delivery and catalyst carriers. 1 Polymeric nanocomposites (NCs) are a new class of materials consisting of nanosized fillers in a polymeric matrix, and possess properties superior to those of conventional microsized filler composites, due to the ultrafine dimensions of the filler. 2,3 Moreover, on account of the unique properties such as enhanced mechanical and thermal properties, reduced flammability as well as high chemical stability, polymer/layered crystal NCs have been recognized as one of the most important organic/inorganic hybrid materials. 4-6 Most of the published works has focused on organically modified smectite clays, in particular montmorillonites, as fillers of polymeric composites. 7-9 Furthermore, the emphasis is placed on layered double hydroxide (LDH) systems rather than clays in recent years due to artificially preparing and highly tunable properties. 10,11 LDHs are a kind of anion clay with unique properties that are not commonly observed in layered silicates. LDHs are well characterized and conventionally used for flame retardants, 12 catalysts, 13 ion exchangers, 14 matrices for biosensors, 15 and supercapacitor electrode material. 16 Their novelty originate from their broad range of chemical composition, highly tunable properties, ease of synthetic procedures in the laboratory, stability in air, interchangeable anions and their potential industrial uses. 17 Ultrathin nanosheets, prepared by delamination of layered hydroxides, have attracted attention due to the extremely small thickness of the order of 1 nm and large lateral size of the order...

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“…According to previous research, usually, there have been two types of NCs depending upon the dispersion of clay particles. 8,10,41 –43 The first type is an intercalated polymer/clay NCs, which consists of well-ordered multilayers of polymer. In these samples, the extent of polymer penetration is not sufficient to delaminate the ordered structures.…”

Section: Resultsmentioning

confidence: 99%

Structural, thermal and mechanical properties of polymer nanocomposites based on organosoluble polyimide with naphthyl pendent group and layered double hydroxide

Dinari

Rajabi

2016

High Performance Polymers

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In this study, a soluble aromatic polyimide (PI) with naphthyl pendent group was initially synthesized by the reaction of pyromellitic dianhydride (PMDA) with 5-methyl- N,N-bis(4-nitrophenyl)naphthalen-1-amine. Then, via co-precipitation reaction of zinc nitrate hexahydrate and chromium nitrate nonahydrate, Zn/Cr-layered double hydroxide (LDH) was synthesized using hydrothermal techniques. Finally, different novel nanocomposites (NCs) based on PI and Zn/Cr-LDH (1, 2, 4 wt%) were produced through in situ polymerization. The resulting materials were characterized by Fourier transform infrared spectroscopy, X-ray powder diffraction, thermogravimetry analysis (TGA), field emission scanning electron microscopy, transmission electron microscopy, and mechanical testing. According to the TGA results, the prepared NCs showed high thermal stability at higher temperature due to the good dispersion and homogeneity of Zn/Cr-LDH in polymeric matrix. Consequently, the mechanical properties of the synthesized NCs were enhanced by the incorporation of 2 wt% Zn/Cr-LDH in the polymer matrix.

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Preparation and characterization of polyimide/modified layered double hydroxide nanocomposites

Cited by 9 publications

References 24 publications

In situ preparation of transparent polyimide nanocomposite with a small load of graphene oxide

In situ preparation of transparent polyimide nanocomposite with a small load of graphene oxide

In situ thermal synthesis of novel polyimide nanocomposite films containing organo-modified layered double hydroxide: morphological, thermal and mechanical properties

Structural, thermal and mechanical properties of polymer nanocomposites based on organosoluble polyimide with naphthyl pendent group and layered double hydroxide

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