Gas Chromatography Techniques

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B Riedl - One of the best experts on this subject based on the ideXlab platform.

  • phase segregation in san pmma blends probed by rheology microscopy and inverse Gas Chromatography Techniques
    Macromolecules, 2002
    Co-Authors: M Bousmina, And A Lavoie, B Riedl
    Abstract:

    Phase segregation in the poly(styrene-co-acrylonitrile)/poly(methyl methacrylate) (SAN/PMMA) blend with lower critical solution temperature (LCST) was assessed by linear viscoelastic rheology, optical microscopy, and inverse Gas Chromatography (IGC) Techniques for various blend compositions. At low temperatures, the blends showed a classical behavior of homogeneous polymer melts, whereas in the vicinity of phase segregation, a shoulder in the storage modulus and in the linear relaxation modulus G(t) was observed. The width of such a low-frequency/longer-time plateau and the terminal relaxation time were found to increase with temperature. Such a behavior was attributed to variable morphologies appearing at different temperatures. The development of the morphology was found to take place within a given interval of temperature rather than at a single critical temperature. Optical microscopy and IGC analyses supported the observed peculiar behavior of such a blend. Time−temperature superposition, origin of e...

  • Phase segregation in SAN/PMMA blends probed by rheology, microscopy, and inverse Gas Chromatography Techniques
    Macromolecules, 2002
    Co-Authors: M Bousmina, And A Lavoie, B Riedl
    Abstract:

    Phase segregation in the poly(styrene-co-acrylonitrile)/poly(methyl methacrylate) (SAN/PMMA) blend with lower critical solution temperature (LCST) was assessed by linear viscoelastic rheology, optical microscopy, and inverse Gas Chromatography (IGC) Techniques for various blend compositions. At low temperatures, the blends showed a classical behavior of homogeneous polymer melts, whereas in the vicinity of phase segregation, a shoulder in the storage modulus and in the linear relaxation modulus G(t) was observed. The width of such a low-frequency/longer-time plateau and the terminal relaxation time were found to increase with temperature. Such a behavior was attributed to variable morphologies appearing at different temperatures. The development of the morphology was found to take place within a given interval of temperature rather than at a single critical temperature. Optical microscopy and IGC analyses supported the observed peculiar behavior of such a blend. Time−temperature superposition, origin of e...

M Bousmina - One of the best experts on this subject based on the ideXlab platform.

  • phase segregation in san pmma blends probed by rheology microscopy and inverse Gas Chromatography Techniques
    Macromolecules, 2002
    Co-Authors: M Bousmina, And A Lavoie, B Riedl
    Abstract:

    Phase segregation in the poly(styrene-co-acrylonitrile)/poly(methyl methacrylate) (SAN/PMMA) blend with lower critical solution temperature (LCST) was assessed by linear viscoelastic rheology, optical microscopy, and inverse Gas Chromatography (IGC) Techniques for various blend compositions. At low temperatures, the blends showed a classical behavior of homogeneous polymer melts, whereas in the vicinity of phase segregation, a shoulder in the storage modulus and in the linear relaxation modulus G(t) was observed. The width of such a low-frequency/longer-time plateau and the terminal relaxation time were found to increase with temperature. Such a behavior was attributed to variable morphologies appearing at different temperatures. The development of the morphology was found to take place within a given interval of temperature rather than at a single critical temperature. Optical microscopy and IGC analyses supported the observed peculiar behavior of such a blend. Time−temperature superposition, origin of e...

  • Phase segregation in SAN/PMMA blends probed by rheology, microscopy, and inverse Gas Chromatography Techniques
    Macromolecules, 2002
    Co-Authors: M Bousmina, And A Lavoie, B Riedl
    Abstract:

    Phase segregation in the poly(styrene-co-acrylonitrile)/poly(methyl methacrylate) (SAN/PMMA) blend with lower critical solution temperature (LCST) was assessed by linear viscoelastic rheology, optical microscopy, and inverse Gas Chromatography (IGC) Techniques for various blend compositions. At low temperatures, the blends showed a classical behavior of homogeneous polymer melts, whereas in the vicinity of phase segregation, a shoulder in the storage modulus and in the linear relaxation modulus G(t) was observed. The width of such a low-frequency/longer-time plateau and the terminal relaxation time were found to increase with temperature. Such a behavior was attributed to variable morphologies appearing at different temperatures. The development of the morphology was found to take place within a given interval of temperature rather than at a single critical temperature. Optical microscopy and IGC analyses supported the observed peculiar behavior of such a blend. Time−temperature superposition, origin of e...

And A Lavoie - One of the best experts on this subject based on the ideXlab platform.

  • phase segregation in san pmma blends probed by rheology microscopy and inverse Gas Chromatography Techniques
    Macromolecules, 2002
    Co-Authors: M Bousmina, And A Lavoie, B Riedl
    Abstract:

    Phase segregation in the poly(styrene-co-acrylonitrile)/poly(methyl methacrylate) (SAN/PMMA) blend with lower critical solution temperature (LCST) was assessed by linear viscoelastic rheology, optical microscopy, and inverse Gas Chromatography (IGC) Techniques for various blend compositions. At low temperatures, the blends showed a classical behavior of homogeneous polymer melts, whereas in the vicinity of phase segregation, a shoulder in the storage modulus and in the linear relaxation modulus G(t) was observed. The width of such a low-frequency/longer-time plateau and the terminal relaxation time were found to increase with temperature. Such a behavior was attributed to variable morphologies appearing at different temperatures. The development of the morphology was found to take place within a given interval of temperature rather than at a single critical temperature. Optical microscopy and IGC analyses supported the observed peculiar behavior of such a blend. Time−temperature superposition, origin of e...

  • Phase segregation in SAN/PMMA blends probed by rheology, microscopy, and inverse Gas Chromatography Techniques
    Macromolecules, 2002
    Co-Authors: M Bousmina, And A Lavoie, B Riedl
    Abstract:

    Phase segregation in the poly(styrene-co-acrylonitrile)/poly(methyl methacrylate) (SAN/PMMA) blend with lower critical solution temperature (LCST) was assessed by linear viscoelastic rheology, optical microscopy, and inverse Gas Chromatography (IGC) Techniques for various blend compositions. At low temperatures, the blends showed a classical behavior of homogeneous polymer melts, whereas in the vicinity of phase segregation, a shoulder in the storage modulus and in the linear relaxation modulus G(t) was observed. The width of such a low-frequency/longer-time plateau and the terminal relaxation time were found to increase with temperature. Such a behavior was attributed to variable morphologies appearing at different temperatures. The development of the morphology was found to take place within a given interval of temperature rather than at a single critical temperature. Optical microscopy and IGC analyses supported the observed peculiar behavior of such a blend. Time−temperature superposition, origin of e...

Abdalbasit Adam Mariod - One of the best experts on this subject based on the ideXlab platform.

  • discrimination of honeys using colorimetric sensor arrays sensory analysis and Gas Chromatography Techniques
    Food Chemistry, 2016
    Co-Authors: Haroon Elrasheid Tahir, Zou Xiaobo, Huang Xiaowei, Shi Jiyong, Abdalbasit Adam Mariod
    Abstract:

    Aroma profiles of six honey varieties of different botanical origins were investigated using colorimetric sensor array, Gas Chromatography–mass spectrometry (GC–MS) and descriptive sensory analysis. Fifty-eight aroma compounds were identified, including 2 norisoprenoids, 5 hydrocarbons, 4 terpenes, 6 phenols, 7 ketones, 9 acids, 12 aldehydes and 13 alcohols. Twenty abundant or active compounds were chosen as key compounds to characterize honey aroma. Discrimination of the honeys was subsequently implemented using multivariate analysis, including hierarchical clustering analysis (HCA) and principal component analysis (PCA). Honeys of the same botanical origin were grouped together in the PCA score plot and HCA dendrogram. SPME-GC/MS and colorimetric sensor array were able to discriminate the honeys effectively with the advantages of being rapid, simple and low-cost. Moreover, partial least squares regression (PLSR) was applied to indicate the relationship between sensory descriptors and aroma compounds.

Gilber R. Rosa - One of the best experts on this subject based on the ideXlab platform.

  • Coconut agro-industrial waste in the production of catalyst containing palladium: The report of a mini-project for teaching of sustainable Suzuki-Miyaura reaction
    Journal of Cleaner Production, 2018
    Co-Authors: Cristiane R. Schmitt, Clarissa H. Rosa, Bruna P. Vargas, Diego S. Rosa, Fabio A. Duarte, Carla W. Scheeren, Toni Jefferson Lopes, Fernanda Trombetta, Gilber R. Rosa
    Abstract:

    Abstract A four-week mini-project for teaching is described for an experimental physical chemistry or organic chemistry course. The activities included synthesis of a Pd catalyst, PdCl 2 supported on calcined coconut shell fiber, and its use in the preparation of 4-methylbiphenyl via Suzuki-Miyaura cross-coupling reaction. The technical skills and concepts that are typically presented in practical chemistry courses were covered, including notions of surface chemistry – development of new catalysts, modern organic synthesis, Gas Chromatography Techniques, separation of mixtures, and stoichiometric calculations.

  • Introducing Undergraduates to Research Using a Suzuki–Miyaura Cross-Coupling Organic Chemistry Miniproject
    Journal of Chemical Education, 2015
    Co-Authors: Deyvid G. M. Oliveira, Clarissa H. Rosa, Bruna P. Vargas, Diego S. Rosa, Ma´rcia V. Silveira, Neusa Fernandes De Moura, Gilber R. Rosa
    Abstract:

    A five-week miniproject is described for an upper-division experimental organic chemistry course. The activities include synthesis of a phenylboronic acid via a Grignard reaction and its use in a Suzuki–Miyaura cross-coupling reaction. Technical skills and concepts normally presented in practical organic chemistry courses are covered, including the use of an inert atmosphere (Schlenk tube technique), separation of mixtures (filtration), melting range determination, infrared (IR) spectrum, stoichiometric calculations and Gas Chromatography Techniques.

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