Fabrication of covalently bonded nanostructured thin films of epoxy resin and polydimethylsiloxane for oil adsorption

Batool, Sadia; Mahmood, Anum; Gill, Rohama; Qureshi, Shahid Saeed; Mazhar, Muhammad; Bououdina, M.

doi:10.1007/s00289-017-1988-0

Cited by 8 publications

(4 citation statements)

References 44 publications

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“…. When the surface of macroporous resin was free of adsorbable space, the adsorption affinity decreased, even disappeared, and a saturated adsorption was achieved . Therefore, it is quite important to find the point of saturated adsorption to choose the optimal loading volume and speed.…”

Section: Resultsmentioning

confidence: 99%

Isolation and enrichment of Ginkgo biloba extract by a continuous chromatography system

Zhu

Cui

Xiao

et al. 2018

J of Separation Science

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In this study, an effective method was developed for the isolation and enrichment of Ginkgo biloba extract by continuous chromatography system. The adsorption and desorption ratio of flavonoids as main index, the best macroporous resin was screened out from six resins by static adsorption and desorption tests. At the same time the adsorption and desorption parameters were optimized by dynamic adsorption and desorption tests. Under optimal parameters, five operations consisting of loading, washing, desorbing, regenerating, and balancing were integrated across the continuous chromatography system for the purpose of refining 66 L of crude extract solution. The results were as follows, 198.22 g of Ginkgo biloba extracts was produced, which contained 65.83 g of flavonoids and 15.44 g of lactones. The content of flavonoids and lactones increased from 2.76 and 0.72% in the crude extract to 33.21 and 7.79%, with a recovery yield of 91.26 and 81.21%. Methodology validation showed that the proposed method had high stability and reproducibility. Compared with the traditional macroporous resin method, the proposed method had a short processing time and low solvent consumption. Our studies indicated that the newly developed method is an effective procedure for the isolation and enrichment of Ginkgo biloba extract.

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Section: Resultsmentioning

confidence: 99%

Isolation and enrichment of Ginkgo biloba extract by a continuous chromatography system

Zhu

Cui

Xiao

et al. 2018

J of Separation Science

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“…The absorbance bands at λ max 202 and 280 nm correspond to aromatic groups present in the selected epoxy while λ max 230 nm is associated with cresol group of epoxy resin . The epoxy functional group can be cured with amino groups provided by PEI and modified clay . Thus, this linear increase in absorbance can be attributed to the increase in the availability of functional sites for incoming components which may have participated in buildup of multilayers via covalent linkage and hydrogen bonding.…”

Section: Resultsmentioning

confidence: 99%

“…Covalently linked abrasion resistant multilayers based upon poly[( o ‐cresyl glycidyl ether)‐ co ‐formaldehyde] (CNER) epoxy with PEI ∼25,000 g/mol (PEI/CNER) n were prepared by our research group where “ n ” depicts the number of deposited layer pairs. Similarly, epoxy and PDMS based multilayers were also fabricated having 60% – 97% oil adsorption capacity . The epoxies being thermoset polymers are viable candidates for the preparation of environmentally stable composite based upon their inherent stiffness, strength, electric insulation, mechanical, chemical and creep resistance, thermal and environmental stabilities …”

Section: Introductionmentioning

confidence: 99%

Layer‐by‐layer fabrication of nacre inspired epoxy/MMT multilayered composites

Batool

Gill

Arshad

et al. 2017

J of Applied Polymer Sci

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The organic-inorganic hybrid multilayered composites are prepared using a unique combination of poly[(o-cresyl glycidyl ether)-co-formaldehyde] (CNER), amino modified montmorillonite (NH 2 -MMT), and polyethyleneimine (PEI). This tricomponent composite multilayer PEI(CNER/NH 2 -MMT/PEI) n deposited via layer-by-layer technique is based upon synergistic combination of covalent and hydrogen bonding. The growth of multilayer was monitored using UV-vis spectroscopy and ellipsometry. When subjected to optical analyses, the prepared multilayered composite films revealed profound optical transmittance 83%-87%. The surface morphological analysis by atomic force microscopy and scanning electron microscopy revealed uniform arrangement of organicinorganic components with relative increase in intensity of elements (C, N, O, Si) as confirmed by X-ray photoelectron spectroscopy studies. The multilayered composites possess 1.99 GPa hardness making them potential candidate for a number of applications where mechanical strength is desired. Moreover, significant resistance against alkaline and organic solvents at minimal deterioration of circa 0.12% has also been observed for the prepared films. The epoxy clay based thin films being robust, scratch resistant, hydrophilic, chemically inert, and mechanically strong are potential candidates for advanced environmental applications.

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“…LbL is actually a sequential exposure of substrates to oppositely charged materials with intermittent steps of rinsing and drying in an inert atmosphere. This process can be repeated several times to get the desired number of layer pairs where one‐layer pair can correspond to the bilayer, trilayer, or quadlayer depending upon the components involved in a single layer deposition architecture . LbL deposited trilayers with alternate adsorption from solutions of PAA, PEI, and MMT have shown 17% reduction in flammability of FPUF .…”

Section: Introductionmentioning

confidence: 99%

Epoxy‐based multilayers for flame resistant flexible polyurethane foam (FPUF)

Batool

Gill

et al. 2020

J of Applied Polymer Sci

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Flexible polyurethane foam (FPUF), a widely used cushioning and comfort component for homeware and automobile industries if tailored for flame resistance, can exhibit enhanced market value. With the view to preparing such protective films, multilayered coating composed of montmorillonite (MMT) and triphenyl phosphate (tPP) along with polyethyleneimine (PEI), poly[(o-cresyl glycidyl ether)-co-formaldehyde] (CNER), tPP solution and MMT suspension was deposited via layer-by-layer technique so as to suppress the flammability of FPUF. A comparative study applying "cone test" revealed that multilayered coatings having PEI(CNER/NH 2 -MMT/ PEI) n and PEI(CNER/NH 2− MMT/tPP) n architectures, where "n" signifies the number of layer pairs, exhibited remarkable decrease in "peak heat release rate" (pHRR) of 20 and 25%, respectively, as compared to uncoated FPUF. Moreover, these coatings showed a 50% reduction in "fire growth rate index" (FIGRA) when compared to uncoated FPUF. This significant decrease in FIGRA after a specific combination of epoxy-clay features that such multilayered coatings can be used to protect the underlying FPUF due to the labyrinth effect offered by MMT and accelerated char formation by tPP. Furthermore, the evolution of volatile gases upon combustion of multilayered coated foam decreased due to the inhibition of oxygen permeation owing to the protective effect of the coating.

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Fabrication of covalently bonded nanostructured thin films of epoxy resin and polydimethylsiloxane for oil adsorption

Cited by 8 publications

References 44 publications

Isolation and enrichment of Ginkgo biloba extract by a continuous chromatography system

Isolation and enrichment of Ginkgo biloba extract by a continuous chromatography system

Layer‐by‐layer fabrication of nacre inspired epoxy/MMT multilayered composites

Epoxy‐based multilayers for flame resistant flexible polyurethane foam (FPUF)

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