Sol–gel titania coating on unmodified and surface-modified polyimide films

Hashizume, Makoto; Hirashima, Michihisa

doi:10.1007/s10971-012-2717-7

Cited by 14 publications

(14 citation statements)

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“…Sol-gel processing is a well-established method for the preparation of hybrid organosilica films at low temperatures (200ºC), and is suitable for the deposit of organic-inorganic layered hybrid materials on various polymer substrates such as polymethylmetacrylate (PMMA), polyimide (PI), and polycarbonate (PC) [25][26][27]. These are typically prepared by a combination of metal alkoxides such as tetraethylorthosilicate (TEOS) and organoalkoxysilanes such as methyltriethoxysilane (MTES) or phenyltriethoxysilane (PTES) via sol-gel processing.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a layered hybrid membrane using an organosilica separation layer on a porous polysulfone support, and the application to vapor permeation

Gong

Wang

Nagasawa

et al. 2014

Journal of Membrane Science

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Using 1,2-bis(triethoxysilyl)ethane (BTESE) as a single precursor, a uniform, defect-free and perm-selective organosilica layer was successfully deposited onto porous polysulfone ultrafiltration (PSF-UF) supports via a simple sol-gel spin-coating and thermal-treatment process. The layered hybrid membranes, where BTESE-derived SiO2 is deposited on polymer supports, were applied to the vapor permeation dehydration of isopropanol-water (90/10 wt%) solutions at 105 ºC, and demonstrated a water flux of 1.6 kg/(m 2 h) and a separation factor of 315 with no selectivity for a PSF-UF support. Long-term stability testing of vapor permeation also confirmed the excellent stability of these BTESE/PSF-UF layered hybrid membranes. Moreover, compared with porous PSF-UF supports, this layered hybrid membrane also showed improved gas separation performance and a moderate (≈10) separation factor for H2/N2.

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Section: Introductionmentioning

confidence: 99%

Fabrication of a layered hybrid membrane using an organosilica separation layer on a porous polysulfone support, and the application to vapor permeation

Gong

Wang

Nagasawa

et al. 2014

Journal of Membrane Science

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“…20) EDX spectra of the deposits showed that they contained Ca, P, O, and small amounts of Na and Mg [ Fig. 3(b)].…”

Section: ¹mentioning

confidence: 99%

“…PI films (Kaptonμ 100H, 25¯m thickness, Du PontToray Co., Ltd.) were treated with aqueous sodium hydroxide (5 wt %) at room temperature for 10 min. 20) The resulting surface-hydrolyzed PI films were then immersed in 1 , 0.75 mM, pH 7.4; prepared according to Kokubo's method 1) ) and incubated at 36.5°C using a dry chamber (AS ONE DOV-750A). After an appropriate length of time, the samples were picked up, rinsed with ultrapure water, and dried using gentle nitrogen flushing.…”

mentioning

confidence: 99%

“…These results were well comparable to our previous report showing that about 10 min of treatment was sufficient to produce carboxylic acid groups all over the PI film surfaces. 20) If microscopic topological changes of PI film surfaces occurred, resulting rough surfaces might induce HAp deposition in SBFs. SEM observation confirmed that such surface morphological change did not occur by the 10-min of treatments (data not shown).…”

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confidence: 99%

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Biomimetic calcium phosphate coating on polyimide films by utilizing surface-selective hydrolysis treatments

Hashizume

Maeda

Iijima

2013

J. Ceram. Soc. Japan

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Hydroxyapatite (HAp) coating on commercially available polyimide (PI) films in simulated body fluid (SBF) was examined. Aqueous sodium hydroxide treatment of PI films under proper conditions proceeded surface-selective hydrolysis of PI molecules, which resulted in displaying carboxylic acid groups on the film surfaces. These surface-hydrolyzed PI films had ability to induce deposition of minerals having similar characteristics to that of HAp thereon when incubated in 1.5SBF, a solution having 1.5 times higher inorganic ion concentrations than those of SBF. No deposition was observed for the case of unmodified PI films under the same condition. Additional pretreatments with aqueous calcium chloride for the surface-hydrolyzed PI films realized complete surface coverage on the films by thin mineral layers in 1.5SBF. The present process for PI films is simple and low-cost, and can be widely applicable to other substrates of polymers that can generate carboxylic acid groups by alkaline hydrolysis.

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“…X. Zhang et al found that silica, alumina and silica–alumina composite coatings on the Kapton substrate by sol–gel method showed good AO resistance property, particularly silica–alumina composite coating whose erosion yield was two orders of magnitude less than that of pristine Katpon . In addition, TiO 2 provides high degree of Kapton protection under harsh LEO environment . I. Gouzman et al found titania coating prepared by liquid phase deposition method provides protection against AO exposure, with erosion yield of 2% of that measured for unprotected Kapton.…”

Section: Introductionmentioning

confidence: 98%

Surface treatment of 25‐μm Kapton film by ammonia for improvement of TiO₂/SiO₂ coating's adhesion

Man

Li²,

Shen

et al. 2017

Surface & Interface Analysis

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Due to a smooth hydrophobic surface of Kapton film, it is very difficult to coat an inorganic oxide coating on its surface. In this study, the surface of Kapton was treated by NH 3 ·H 2 O and silicon coupling agent to improve the polymer surface wettability. Changes in surface hydrophilicity were studied by contact angle measurement. The samples were irradiated by atomic oxygen (AO) in a ground-based simulation system. TiO 2 /SiO 2 multi-layer coatings were prepared on the surface of Kapton by sol-gel method to resist AO erosion. The optical transmittance and surface morphology of samples were investigated by UV-vis spectroscopy and scanning electronic microscope. The results indicated that the TiO 2 /SiO 2 sol could easily form a uniform thin coating on the surface of pretreated Kapton. After AO exposure, the coatings became more compact, without peeling off. The AO erosion yield value of coated Kapton was sharply down, and the samples had good optical transparency.

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Sol–gel titania coating on unmodified and surface-modified polyimide films

Cited by 14 publications

References 15 publications

Fabrication of a layered hybrid membrane using an organosilica separation layer on a porous polysulfone support, and the application to vapor permeation

Fabrication of a layered hybrid membrane using an organosilica separation layer on a porous polysulfone support, and the application to vapor permeation

Biomimetic calcium phosphate coating on polyimide films by utilizing surface-selective hydrolysis treatments

Surface treatment of 25‐μm Kapton film by ammonia for improvement of TiO₂/SiO₂ coating's adhesion

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Sol–gel titania coating on unmodified and surface-modified polyimide films

Cited by 14 publications

References 15 publications

Fabrication of a layered hybrid membrane using an organosilica separation layer on a porous polysulfone support, and the application to vapor permeation

Fabrication of a layered hybrid membrane using an organosilica separation layer on a porous polysulfone support, and the application to vapor permeation

Biomimetic calcium phosphate coating on polyimide films by utilizing surface-selective hydrolysis treatments

Surface treatment of 25‐μm Kapton film by ammonia for improvement of TiO2/SiO2 coating's adhesion

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Surface treatment of 25‐μm Kapton film by ammonia for improvement of TiO₂/SiO₂ coating's adhesion