Preparation and characterization of polyimide–silica hybrid membranes on kieselguhr–mullite supports

Shunhe, Zhong; Li, Chuan‐Feng; Xiao, Xinfeng

doi:10.1016/s0376-7388(01)00676-7

Cited by 59 publications

(24 citation statements)

References 12 publications

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“…The prepared hybrids exhibited lithographical patterns with good resolution, suggesting potential applicability in the field of optoelectronic devices. Since PI hybrid materials combine the basic properties of organic and inorganic constituents, they can offer specific advantages for the preparation of membranes with enhanced selectivity and permeability, and improved thermal and chemical resistance [71,72]. In particular, PI/silica membranes have been found to exhibit promising gas permeation qualities and have been tailored to accommodate specific gas separations.…”

Section: Applicationsmentioning

confidence: 99%

Polyimide/silica hybrids via the sol-gel route: High performance materials for the new technological challenges

Ragosta¹,

Musto²

2009

Express Polym. Lett.

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Abstract. The present review article describes in detail the state-of-the-art of organic-inorganic hybrid materials based on polyimide/silica components. The article is divided in three parts. In the first the basic processing route for the preparation of these systems is described, i.e. the sol-gel technique, along with the strategies developed to control the final morphology. In the second part the curing characteristics, the dynamic-mechanical and the mechanical and fracture properties of hybrids with different morphologies are reviewed. Finally, the more technologically relevant applications devised for these high performance materials are discussed. : nanocomposites, hybrid materials, polyimide, silica, sol-gel eXPRESS Polymer Letters Vol.3, No.7 (2009) [413][414][415][416][417][418][419][420][421][422][423][424][425][426][427][428] Available online at www.expresspolymlett.com DOI: 10.3144/expresspolymlett.2009.51 or as functional materials [14] such as catalyst supports [15] and microelectronic devices [16]. The sol-gel route represents the preferred way for the synthesis of polyimide based hybrids. The classical sol-gel process consists in a two step hydrolysis-condensation reaction, starting with a metal alkoxides M(OR) 4 , typically tetraethoxisilane Si(OCH 2 CH 3 ) 4 or titanium isopropoxide Ti[OCH(CH 3 ) 2 ] 4 , to produce hydroxyl groups followed by the polycondensation of the hydroxyl groups and residual alkoxy groups to form a three-dimensional network [5,[17][18][19][20][21]. Polyimides are particularly suited for this type of process because they can be obtained from polyamic acid precursors, which are soluble in hygroscopic solvents and can, therefore, tolerate the addition of water necessary to bring about the hydrolysis of the metal alkoxide. Moreover, the outstanding thermal stability of polyimides allows the hybrids to be post-cured at very high temperatures (300-350°C) making it possible the development of a very dense inorganic network without inducing appreciable degradation of the organic phase. Polyimide/silica hybrids made by the sol-gel technique are the subject of this review, in which the approaches used for a close control of their final morphology, the effects of the silica phase on the curing process of polyimide precursors, the dynamic-mechanical and the mechanical and fracture properties that these materials can display, and their possible applications will be presented and discussed. Keywords Processing and morphologyA typical procedure for the preparation of PI/silica hybrids via the sol-gel route, involves the following steps: i) The polyamic acid (PAA) (PI precursor) is formed by a polyaddition reaction of a dianhydride [e.g., pyromellitic anhydride (PMDA), 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA), or 2,2-bis(3,4-dicarboxy-phenyl)-hexafluoropropane dianhydride (6FDA)] with a diamine [e.g., 4,4′-oxydianiline (ODA), or p-phenylen diamine (PPA)] in a common solvent [e.g., dimethylacetamide (DMAc), or N-methyl pyrolidone (NMP)]. The reaction and chemical str...

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Section: Applicationsmentioning

confidence: 99%

Polyimide/silica hybrids via the sol-gel route: High performance materials for the new technological challenges

Ragosta¹,

Musto²

2009

Express Polym. Lett.

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“…Among the mostly used inorganic nanoparticles, nano-sized titanium dioxide (TiO 2 ) is special interested for its good performance like high hydrophilicity, good chemical stability, antibacterial property, avirulent et al [21], and anatase TiO 2 could also be used as a photocatalyst in waste water treatment [22]. Three methods have been reported to prepare polymer-inorganic composite membranes: (1) Disperse the nanoparticles in the casting solution directly and prepare the composite membranes via phase inversion [11][12][13][14][15][16]; (2) Add the prepared sol containing nanoparticles in the casting solution and prepare the composite membranes via phase inversion [17,23,24]; (3) Dip the prepared membrane in the aqueous suspension containing nanoparticles and prepare the composite membranes via self-assembling [25,26].…”

Section: Introductionmentioning

confidence: 99%

Effect of TiO2 nanoparticles on the surface morphology and performance of microporous PES membrane

Yang

et al. 2009

Applied Surface Science

591

239

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“…The sol-gel technique is one of the most extensively applied method for preparation of organicinorganic nanomaterials, which allows the formation of inorganic frameworks under mild condition and incorporation of minerals into polymers, resulting in an increased chemical, mechanical and thermal stability without obviously decreasing the properties of the polymers [7][8][9]. Furthermore, the remained hydrogen bond clusters at the surfaces of the materials after the sol-gel reaction improves the membrane hydrophilicty and enhances hybrid material stability [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterizations of a new PS/TiO2 hybrid membranes by sol–gel process

Yang

Wang

2006

Polymer

195

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Preparation and characterization of polyimide–silica hybrid membranes on kieselguhr–mullite supports

Cited by 59 publications

References 12 publications

Polyimide/silica hybrids via the sol-gel route: High performance materials for the new technological challenges

Polyimide/silica hybrids via the sol-gel route: High performance materials for the new technological challenges

Effect of TiO2 nanoparticles on the surface morphology and performance of microporous PES membrane

Preparation and characterizations of a new PS/TiO2 hybrid membranes by sol–gel process

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