The Experts below are selected from a list of 183 Experts worldwide ranked by ideXlab platform
Kurt Ingar Draget - One of the best experts on this subject based on the ideXlab platform.
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mechanical properties of mammalian and fish gelatins based on their Weight average Molecular Weight and Molecular Weight distribution
Food Hydrocolloids, 2009Co-Authors: Jonhard Eysturskarð, Ingvild Johanne Haug, Annsissel Teialeret Ulset, Kurt Ingar DragetAbstract:Acid porcine skin gelatins (type A), lime bone gelatins (type B) and gelatin from different cold water fish species were compared on the basis of low deformation mechanical properties, Bloom value, Weight average Molecular Weight, Molecular Weight distribution and isoelectric point. The dynamic storage modulus and Bloom value for all types of gelatin increased with increasing Weight average Molecular Weight. Type A and type B gelatins with similar Weight average Molecular Weight exhibited different dynamic storage modulus (G') and different Bloom values. This is most probably due to a different Molecular Weight distribution as well as the presence of different hydrolytic fragments. The present study suggests that it may be possible to improve the mechanical properties by removing low Molecular Weight molecules from a gelatin sample. The Bloom values for gelatin from haddock, saithe and cod were determined to be 200, 150 and 100 g from a linear correlation between G' and Bloom.
Pavel Kratochvil - One of the best experts on this subject based on the ideXlab platform.
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polystyrene equivalent Molecular Weight versus true Molecular Weight in size exclusion chromatography
Polymer, 2003Co-Authors: Milos Netopilik, Pavel KratochvilAbstract:Abstract The evaluation of the size-exclusion chromatography (SEC) concentration elution curves by means of a calibration dependence obtained in a given SEC set for a polymer different from the polymer to be analyzed results in an error in the determination of both Molecular Weight and Molecular-Weight distribution (MWD). The problem is analyzed assuming the validity of the universal-calibration concept. The differences between the true and apparent values of Molecular Weight, MWD and Mw/Mn depend on and are expressed in terms of the parameters of the Mark–Houwink–Kuhn–Sakurada equation, describing the Molecular-Weight dependence of intrinsic viscosity, for the polymer to be analyzed and the polymer used for calibration. The differences in Molecular Weight and the Mw/Mn ratio are typically tens of percent and, in extreme cases, can amount up to a factor of three for Molecular Weight and a factor of two for the Mw/Mn ratio.
P. S. Sampathkumaran - One of the best experts on this subject based on the ideXlab platform.
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The effect of polymer Molecular Weight in the adsorption process
Journal of Colloid And Interface Science, 1990Co-Authors: R. Janardhan, P. H. Gedam, P. S. SampathkumaranAbstract:The stability of pigment dispersions, which governs most of the film properties of paints, depends on the type and the extent of polymer species adsorbed by a pigment. The adsorption dependency with respect to Molecular Weight of the polymer and concentration of its solution was studied using epoxy esters of different Molecular Weights as adsorbates and anatase titanium dioxide as adsorbent. The amount of polymer adsorbed was determined by infrared spectroscopy. The type of Molecular Weight species adsorbed from unfractionated binder, the competitive adsorption in presence of more than one Molecular Weight species, and displacement of one Molecular Weight species by the other at different concentrations of the resin solutions were followed by gel permeation chromatography. The hiding power of paint and the gloss of the paint film, which are dependent on the degree of dispersion, were examined and the results correlated with the types of Molecular Weight species used in paint formulations. The type of Molecular Weight species adsorbed was found to be concentration dependent: the lower the concentration, the higher the Molecular Weight species adsorbed. The dispersions of pigment in the solution of higher-Molecular-Weight species were found to be more stable than those derived from lower-Molecular-Weight resin solutions. The TiO2 paint derived from higher-Molecular-Weight epoxy resins had better gloss and hiding power. ?? 1990.
Jonhard Eysturskarð - One of the best experts on this subject based on the ideXlab platform.
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mechanical properties of mammalian and fish gelatins based on their Weight average Molecular Weight and Molecular Weight distribution
Food Hydrocolloids, 2009Co-Authors: Jonhard Eysturskarð, Ingvild Johanne Haug, Annsissel Teialeret Ulset, Kurt Ingar DragetAbstract:Acid porcine skin gelatins (type A), lime bone gelatins (type B) and gelatin from different cold water fish species were compared on the basis of low deformation mechanical properties, Bloom value, Weight average Molecular Weight, Molecular Weight distribution and isoelectric point. The dynamic storage modulus and Bloom value for all types of gelatin increased with increasing Weight average Molecular Weight. Type A and type B gelatins with similar Weight average Molecular Weight exhibited different dynamic storage modulus (G') and different Bloom values. This is most probably due to a different Molecular Weight distribution as well as the presence of different hydrolytic fragments. The present study suggests that it may be possible to improve the mechanical properties by removing low Molecular Weight molecules from a gelatin sample. The Bloom values for gelatin from haddock, saithe and cod were determined to be 200, 150 and 100 g from a linear correlation between G' and Bloom.
Milos Netopilik - One of the best experts on this subject based on the ideXlab platform.
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polystyrene equivalent Molecular Weight versus true Molecular Weight in size exclusion chromatography
Polymer, 2003Co-Authors: Milos Netopilik, Pavel KratochvilAbstract:Abstract The evaluation of the size-exclusion chromatography (SEC) concentration elution curves by means of a calibration dependence obtained in a given SEC set for a polymer different from the polymer to be analyzed results in an error in the determination of both Molecular Weight and Molecular-Weight distribution (MWD). The problem is analyzed assuming the validity of the universal-calibration concept. The differences between the true and apparent values of Molecular Weight, MWD and Mw/Mn depend on and are expressed in terms of the parameters of the Mark–Houwink–Kuhn–Sakurada equation, describing the Molecular-Weight dependence of intrinsic viscosity, for the polymer to be analyzed and the polymer used for calibration. The differences in Molecular Weight and the Mw/Mn ratio are typically tens of percent and, in extreme cases, can amount up to a factor of three for Molecular Weight and a factor of two for the Mw/Mn ratio.
