Preparation and evaluation of isocyanate-based polyimides as liquid phase for gas chromatography

Mathews, R. G.; Schwartz, Robert D.; Novotný, Miloš V.; Zlatkis, A.

doi:10.1021/ac60304a050

Cited by 20 publications

(3 citation statements)

References 13 publications

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“…Polyimide (PI), a class of thermal stable polymers, is well known and widely used in different fields of industries for their extremely high thermal and chemical stability and excellent electrical and mechanical properties. [14][15][16] For example, cobalt-containing PI has been studied and applied for moisture sensing and absorption. [17] The well-dispersed hexagonal boron nitride (h-BN) composite films with oriented cross-linked liquid crystalline (LC) polyimide were obtained as high thermally conductive materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation and enhanced properties of Fe3O4 nanoparticles reinforced polyimide nanocomposites

Ding

Yan

Zhang

et al. 2015

Superlattices and Microstructures

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Polyimide (PI) nanocomposite reinforced with Fe 3 O 4 nanoparticles (NPs) at various NPs loadings levels of 5.0, 10.0, 15.0, and 20.0 wt% were prepared. The chemical interactions of the Fe 3 O 4 NPs/PI nanocomposites were characterized using Fourier Transform Infrared (FT-IR) spectroscopy. X-ray Diffraction (XRD) results revealed that the addition of NPs had a significant effect on the crystallization of PI. Scanning electron microscope (SEM) and the atomic force microscope (AFM) were used to characterize the dispersion and surface morphology of the Fe 3 O 4 NPs and the PI nanocomposites. The obtained optical band gap of the nanocomposites characterized using Ultraviolet-Visible Diffuse Reflectance Spectroscopy (UV-Vis DRS) was decreased with increasing the Fe 3 O 4 loading. Differential scanning calorimetry (DSC) results showed a continuous increase of T g with increasing the Fe 3 O 4 NPs loading. Some differences were observed in the onset decomposition temperature between the pure PI and nanocomposites since the NPs and the PI matrix were physically entangled together to form the nanocomposites. The contact angle of pure PI was larger than that of Fe 3 O 4 /PI nanocomposites films, and increased with increasing the loading of Fe 3 O 4. The degree of swelling was increased with increasing the Fe 3 O 4 loading and the swelling time. The dielectric properties of the nanocomposite were strongly related to the Fe 3 O 4 loading levels. The Fe 3 O 4 /PI magnetic property also had been improved with increasing the loading of the magnetic nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Preparation and enhanced properties of Fe3O4 nanoparticles reinforced polyimide nanocomposites

Ding

Yan

Zhang

et al. 2015

Superlattices and Microstructures

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“…New and different materials continue to be investigated as possible GC column packings for the separation of hydrocarbon mixtures. Mathews et al (1231,1241) described the preparation and evaluation of isocyanate-based polyimides as liquid phases for gas chromatography in two publications. The noncross-linked, organic solvent-soluble polyimides prepared by reacting C36 dimer diisocyanate with anhydride, formed homogeneous, tenacious films on siliceous and steel surfaces anil were stable up to 325 °C.…”

Section: Asphaltmentioning

confidence: 99%

Petroleum

King¹

1973

Anal. Chem.

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“…There are some exceptional cases in which the response to the presence of the component eluted (net response) is given by a decrease in the background response [e.g. the electron capture detector (7)] or in which the positive response is proportional to the background response (2, 3) [e.g., the alkali flame ionization detector (4, 5)]. These special cases obviously require a compromise in the setting of the detector sensitivity to attain optimum performance.…”

Section: Any Gas Chromatographicmentioning

confidence: 99%

Role of background detector response in quantitative gas chromatography

Novák¹,

Gelbicova-Ruzickova²,

Wičar³

et al. 1971

Anal. Chem.

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A theoretical analysis of the effects of the background detector response on the net response to a substance was performed. The effects were investigated experimentally with the use of two stationary phases of different volatilities, employing the flame ionization detector. The change in relative response factors caused by bleeding of the stationary phase and the systematic errors incidental to the use of a volatile stationary phase in quantitative PTGC are demonstrated, ANY GAS CHROMATOGRAPHIC DETECTOR, operated under usual conditions in a conventional set-up, produces a certain background response. Despite attempts to compensate for this response, it usually enhances the noise level and should therefore be kept as low as possible. There are some exceptional cases in which the response to the presence of the component eluted (net response) is given by a decrease in the background response [e.g. the electron capture detector ( I ) ] or in which the positive response is proportional to the background response (2, 3) [e.g., the alkali flame ionization detector (4, 5)]. These special cases obviously require a compromise in the setting of the detector sensitivity to attain optimum performance.There is still another problem associated with the background detector response. AS shown below, in spite of various methods of compensating for the background response, it may cause a decrease in the net response. In this

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Preparation and evaluation of isocyanate-based polyimides as liquid phase for gas chromatography

Cited by 20 publications

References 13 publications

Preparation and enhanced properties of Fe3O4 nanoparticles reinforced polyimide nanocomposites

Preparation and enhanced properties of Fe3O4 nanoparticles reinforced polyimide nanocomposites

Petroleum

Role of background detector response in quantitative gas chromatography

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