CALORIMETRIA DIFERENCIAL DE VARREDURA PDF

He has a PhD in biophysical chemistry and spent many years in the area of label free interaction analysis, a discipline in which he has published widely and includes contributions to a number of educational textbooks. Essentially all biological processes involve changes in inter- and intramolecular interactions. The forces involved in these interactions are quantitated by thermodynamic parameters, and are part of the complete structure-function-thermodynamics description of biomolecular interactions. These processes involve proteins including enzymes and antibodies , nucleic acids, lipids, including biological membranes , polymers, as well as nanoparticles, surfactants, carbohydrates, and other molecules. Thermodynamics are used to characterize interactions as well as an aid in the discovery, design and development of new drugs. Differential scanning calorimetry DSC is used to study intramolecular interactions, such as protein unfolding and stability.

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Abstract The manufacture of natural rubber goods from the latex has significant commercial interest. The processes to obtain these artifacts, the type and amounts of the vulcanization systems used are of utmost importance in determining their quality and suitability. A number of techniques can be used to verify the efficiency of both the processing and the vulcanization systems. The objective of this work was the study of the efficiency of NR latex vulcanization carried out by two vulcanization systems, namely SV1 conventional system and SV2 efficient system in different concentrations, by differential scanning calorimetry DSC.

The DSC has been found to be a very efficient technique for the acquisition of data which would allow the determination of the vulcanization rate, pre-vulcanization time and the excess of crosslinks in elastomers latexes compositions.

The results have been corroborated by stress strength tests and optical analysis. In general, the conventional system, SV1, as compared with the efficient SV2, gave the best results, under the experimental conditions, since it provided a higher vulcanization rate, better process safety and better mechanical behavior.

Peethambaran, N. Rubber Process. Gazeley, K. Roberts ed. Rippel, M. Colloid and Interface Sci. Garnier, B. Acta, , p. Coran, A. Eirich ed , Academic Press Inc. Chough, S. Travas-Sejdic, J.

Rochette, B. Acta, 85, p. Mathew, G. Brazier, D. Wang, P. Nasir, M. Links PDF.

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Uso de DSC na Determinação de Parâmetros de Vulcanização de Látex de Borracha Natural

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Show full item record Recommend this item. Santana, Cesar Costapinto, The blends were prepared from two different methods: casting and melting, obtaining samples in the forms of films and pins, respectively. These experiments used the Fourier transform intrared spectroscopy FT-IR coupled with attenuated total reflectance ATR in a continuous flow system, and simulated the physiological conditions in real time to study the biomaterials biocompatibility. The biocompatibility study was complemented using capillary electrophoresis analysis. It is suggested that the PLLA presence promoted these results.

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From professional translators, enterprises, web pages and freely available translation repositories. Differential scanning calorimetry. Differential Scanning Calorimetry. Please delete it you feel so. Calorimetria Diferencial de Varredura.

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Abstract The manufacture of natural rubber goods from the latex has significant commercial interest. The processes to obtain these artifacts, the type and amounts of the vulcanization systems used are of utmost importance in determining their quality and suitability. A number of techniques can be used to verify the efficiency of both the processing and the vulcanization systems. The objective of this work was the study of the efficiency of NR latex vulcanization carried out by two vulcanization systems, namely SV1 conventional system and SV2 efficient system in different concentrations, by differential scanning calorimetry DSC.

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In the SEM images, in both foams and precursors, the interface between the phases was eminently physic with two distinct phases with gaps between them, and an increase in size of the gaps was observed in the foam. It was observed that in the samples with SEP occurred greater generation of smaller cell and more compact. This demonstrates that SEP presented, as well as the starch granules, the nucleating agent behavior. This effect happened because the interface between starch and PLA be more energetic, which facilitated the crystals formation in the PLA matrix. In the mechanical analysis, flexion and traction, with increasing starch content in the blends lower resistance and maximum deformation as the tension and rupture deformation were obtained. Additionally, the same decrease in performance was maintained for composites SEP.

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