Hybrid films of poly(ethylene oxide- b -amide-6) containing sol–gel silicon or titanium oxide as inorganic fillers: effect of morphology and mechanical properties on gas permeability

Zoppi, Rita Aparecida; Neves, Silmara; Nunes, Suzana Pereira

doi:10.1016/s0032-3861(99)00751-x

Cited by 102 publications

(50 citation statements)

References 35 publications

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“…[9] Besides the standard applications, these hybrid materials can also be used as membranes for gasseparation. [10] Such hybrid membranes avail the advantages of both organic and inorganic components. Organic components contribute to the formation of defect free and less brittle inorganic membranes.…”

Section: Introductionmentioning

confidence: 99%

Permeability and Conductivity Studies on Ionomer‐Polysilsesquioxane Hybrid Materials

Karthikeyan

Nunes²,

Schulte

2006

Macro Chemistry & Physics

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Summary: Hybrid materials based on sulphonated poly(ether ether ketone) (SPEEK, ionomer) and (RSiO1.5)n network (polysilsequioxane) were prepared by sol‐gel process. Two different precursors namely aminopropyl trimethoxysilane (APTMS) and imidazoleglycidoxypropyl trimethoxysilane (IGPTMS) were utilized to generate (RSiO1.5)n in SPEEK matrix by sol‐gel process. 29Si MAS NMR confirmed the formation of RSiO3/2 network structure inside the matrix. Characterisation of the hybrid materials showed lower methanol and water permeability compared to the plain SPEEK. They are therefore promising materials as membranes for direct methanol fuel cells applications. The hybrid material derived from amino group was more effective in decreasing the permeability than the material derived from imidazole group. However, the proton conductivity of the latter was higher than the material derived from amino group. The results indicate that hybrid material prepared from imidazole containing silane is more suitable as a membrane for direct methanol fuel cell than the one prepared from amino carrying silane because it fulfils the two main requirements, namely low methanol permeability and reasonably good proton conductivity.Figure shows a network of silica phase in SPEEK matrix.magnified imageFigure shows a network of silica phase in SPEEK matrix.

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Section: Introductionmentioning

confidence: 99%

Permeability and Conductivity Studies on Ionomer‐Polysilsesquioxane Hybrid Materials

Karthikeyan

Nunes²,

Schulte

2006

Macro Chemistry & Physics

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“…Thus, SiO 2 /TiO 2 -nanocomposites (with sizes %10 Ä 50 nm) were obtained on the basis of petroleum sulfonate ionomers, and TiO 2 /ZrO 2 nanocomposites were formed from Ti(OR) 4 , Zr (OR) 4 in matrices of co-polymer styrene with 4-vinyl phenol, etc. This way is also convenient for synthesis of Ti, Ta, and Nb bimetal nanocomposites, which are interesting for catalytic application (see, for example [214,215]) and even for ternary compounds like Ti-Zr-Sn, Ti-Zr-Al, and also complex perovskite oxides Ba 1Àx Sr x TiO 3 , Ga-Si-O-materials including acid centers, serving good precursors for new catalysts, Brönsted acids and many others. The most important value have zircon ZrSiO 4 (or SiO 2 ÁZrO 2 ), obtained from ZrOCl 2 Á8H 2 0 or Zr(OPr i ) 4 and Si (OEt) 4 with the following heat treatment, and V-or Ni-zircons.…”

Section: Hybrid Nanocomposites Based On Heteroelementalmentioning

confidence: 99%

Physics and Chemistry of Sol-Gel Nanocomposites Formation

Pomogailo

Джардималиева

2014

Nanostructured Materials Preparation via Condensation Ways

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This method called sol-gel or dip-and spin-on-glass process, spin-spray-coating, sol -gel glasses, which was widely used in the second half of the twentieth century [1] 1 is one of the most universal condensation ways of production of nanoparticles stabilized by inorganic oxide or polymeric matrices. A special interest is attracted to materials obtained by combination of sol-gel chemistry and aerosol or spray processes, and combination of sol-gel synthesis with intercalation. This also includes combinations of sol-gel processes with different types of thermolysis, and approaches met in nature in biomineralization processes, etc., which are new aspects of integrative chemistry approach. Traditional sol-gel concept is based on hydrolysis and condensation of metal alkoxides and many metalloids including different ways of their modification [2,3]. Main reactions proceed at relatively low temperatures with usage of prepared in advance or synthesized in parallel polymers, and are convenient techniques for preparation of organic-inorganic nanocomposites compared with commercial silicate-intercalation technique. Sizes of formed nanoparticles in a composite can be reduced to 10 nm by choice of relative conditions. Polymer-inorganic materials have high mechanical strength and thermal stability in combination with optimal heat transport properties. They are widely used in practice due to unique physical and chemical properties: incorporation of nanometric inorganic component into polymeric matrix improves mechanical properties of material [4][5][6][7], permeability of polymers [8]. Light-sensitive materials are used in optic and electronic industry, printed-circuit boards, photoconductive cells, as key elements in solid coatings, packing materials, as cover materials they have good transparency [9][10][11]. For example, sol-gel method was used to produce various polymer/TiO 2 composites with high refractive index [12]. Such type of composites are used for chromatographic carriers, membrane materials, these are the main class of plastics for different applications, including airspace. Controlled properties of the surface of these colloid 1 We refer here to the recent review devoted to celebration of 40th anniversary of innovation researches in polymer-inorganic ceramics produced by sol-gel technique [1].

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“…During the past decades, different inorganic phases (e.g. SiO 2 , TiO 2 , and ZrO 2 ) were in situ generated during the casting of PEBAX TM membranes from solutions using alkoxides as precursors [35,36]. The incorporation of inorganic phase in a polymer matrix leads also to improved solvent resistance and thermal stability of PE-BAX TM polymer [37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

PEBAXTM-Silanized Al2O3Composite. Synthesis and Characterization

Ignacio¹,

Almeida²,

Karl³

et al. 2012

OJPChem

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Alumina nanoparticles were dispersed in poly(amide 12-b-tetramethylene oxide) copolymer through extrusion. The alumina particles were functionalized with 3-(2 trimethoxysilylethyl) cyclohexene oxide. The following PEBAX TM / Al 2 O 3 proportions were prepared: 0.1, 1.0, 5.0, and 10.0% w/w. The thermal stability of the nanocomposites was evaluated by thermograviemtric analysis under N 2 and was comparable to the neat PEBAX TM polymer. The thermo-oxidative degradation of the polymeric matrix by oxygen was strongly hindered by the functionalized alumina. The rule of mixture would predict that the thermal degradation should be strongly dominated by PEBAX TM matrix. Therefore, the physical mixture of PEBAX TM and silanized alumina should be almost as stable as pure PEBAX TM . However, the experimental results suggest that the nanocomposites are more stable than the mixture of their components. This stabilization effect is evident in the temperature range between 300˚C and 400˚C, in which the degradation of the PA12 block takes place.

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Hybrid films of poly(ethylene oxide- b -amide-6) containing sol–gel silicon or titanium oxide as inorganic fillers: effect of morphology and mechanical properties on gas permeability

Cited by 102 publications

References 35 publications

Permeability and Conductivity Studies on Ionomer‐Polysilsesquioxane Hybrid Materials

Permeability and Conductivity Studies on Ionomer‐Polysilsesquioxane Hybrid Materials

Physics and Chemistry of Sol-Gel Nanocomposites Formation

PEBAX<sup>TM</sup>-Silanized Al<sub>2</sub>O<sub>3</sub>Composite. Synthesis and Characterization

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Hybrid films of poly(ethylene oxide- b -amide-6) containing sol–gel silicon or titanium oxide as inorganic fillers: effect of morphology and mechanical properties on gas permeability

Cited by 102 publications

References 35 publications

Permeability and Conductivity Studies on Ionomer‐Polysilsesquioxane Hybrid Materials

Permeability and Conductivity Studies on Ionomer‐Polysilsesquioxane Hybrid Materials

Physics and Chemistry of Sol-Gel Nanocomposites Formation

PEBAX&lt;sup&gt;TM&lt;/sup&gt;-Silanized Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;Composite. Synthesis and Characterization

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PEBAX<sup>TM</sup>-Silanized Al<sub>2</sub>O<sub>3</sub>Composite. Synthesis and Characterization