Sol-gel polyimide-silica composite membrane: gas transport properties

Joly, Catherine; Goizet, S.; Schrotter, Jean‐Christophe; Sánchez, J.; Escoubes, M.

doi:10.1016/s0376-7388(97)00008-2

Cited by 161 publications

(84 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…From the coating time control and the concentration of sol, a desired hybrid membrane for nanofiltration can be obtained. The effect of introduction of silica particles prepared by the solgel technique on the gas transport properties of a polyimide film was studied by Joly et al (1997). From permeation studies at 3.155 Pa, the composite membrane showed higher permeability (N 2 , O 2 , CO 2 , H 2 and CH 4 ) coefficients and hydrogen permselectivities than the polyimide one.…”

Section: Sol-gel Processmentioning

confidence: 99%

Organic-inorganic hybrid membranes in separation processes: a 10-year review

Souza

Quadri

2013

Braz. J. Chem. Eng.

View full text Add to dashboard Cite

-In relation to some inorganic membranes, polymeric membranes have relatively low separation performance. However, the processing flexibility and low cost of polymers still make them highly attractive for many industrial separation applications. Polymer-inorganic hybrid membranes constitute an emerging research field and have been recently developed to improve the separation properties of polymer membranes because they possess properties of both organic and inorganic membranes such as good hydrophilicity, selectivity, permeability, mechanical strength, and thermal and chemical stability. The structures and processing of polymer-inorganic nanocomposite hybrid membranes, as well as their use in the fields of ultrafiltration, nanofiltration, pervaporation, gas separation and separation mechanism are reviewed.

show abstract

Section: Sol-gel Processmentioning

confidence: 99%

Organic-inorganic hybrid membranes in separation processes: a 10-year review

Souza

Quadri

2013

Braz. J. Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…In particular, PI/silica membranes have been found to exhibit promising gas permeation qualities and have been tailored to accommodate specific gas separations. Joly et al [73] conduced a study on transport properties of a series of gases (N 2 , O 2 , H 2 , CO 2 and CH 4 ) in polyimide hybrids charged with silica particles. The composite membranes showed higher permeability coefficients when compared with the pure polyimide.…”

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.

View full text Add to dashboard Cite

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...

show abstract

“…This is particularly so if the imidization is carried out in the presence of metal oxide precursor. The hydrolysis of corboxylate groups of amic acid might be slow 34 if the metal oxide precursor remains bonded to amic acid until all alkoxide groups have been hydrolyzed off. The curing conditions in the present work were improved by enhancing the curing time at the temperature where the imidization process has been reported 35,36 to be the maximum.…”

Section: Resultsmentioning

confidence: 99%

Morphology and thermo‐mechanical properties of compatibilized polyimide‐silica nanocomposites

Al-Kandary

Ali

Ahmad

2005

J of Applied Polymer Sci

View full text Add to dashboard Cite

Polyimide-silica nanocomposites have been prepared from an aromatic polyamic acid derived from pyromellitic dianhydride and oxydianiline and a silica network using the sol-gel reaction. Compatibilization of the two components was achieved by modifying the silica network with imide linkages. Morphology, thermal, and mechanical properties of these composite materials were studied as a function of silica content and compared with the one in which reinforcement of the polyimide was achieved using a pure silica network. There was considerable reduction in the silica particle size with more homogeneous distribution in the matrix when imide spacer groups were introduced in the silica network. The tan ␦ spectra obtained from dynamic thermal mechanical analysis shows a large increase in the glass transition temperature with increasing silica content for the compatibilized system in contrast to the un-compatibilized one. Mechanical properties of the polyimide composites improved due to better interaction between the organic and inorganic phases.

show abstract

Sol-gel polyimide-silica composite membrane: gas transport properties

Cited by 161 publications

References 22 publications

Organic-inorganic hybrid membranes in separation processes: a 10-year review

Organic-inorganic hybrid membranes in separation processes: a 10-year review

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

Morphology and thermo‐mechanical properties of compatibilized polyimide‐silica nanocomposites

Contact Info

Product

Resources

About