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Use of glass transition temperature for stabilization of board's cracks of Eucalyptus grandis Anais da ABC (AABC)
Calonego,Fred W.; Severo,Elias T.D.; Cunha,Antonio R.; Gaia,Daiane C..
The Eucalyptus grandis logs temperatures were determined and correlated with the board's cracks during steaming. Thermocouples were inserted in the logs center, registering their temperatures during steaming at 90"C. The logs were sawed and the board's cracks measured. It was concluded that: (1) the logistic S-shaped curve explains the logs temperature variation; (2) the logs with diameter of 20 to <25, 25 to <30 and 30 to <35 cm presented, respectively, 84.2"C, 73.1"C and 45.8"C in the steaming; and (3) the cracks lengths significantly decreased in logs that reached the glass transition temperature.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Board's cracks; Eucalyptus grandis; Glass transition temperature; Logs steaming.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300025
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Ascorbic acid encapsulation in a glassy carbohydrate matrix via hot melt extrusion: Preparation and characterization Ciênc. Tecnol. Aliment.
CHANG,Dawei; HAYAT,Khizar; ABBAS,Shabbar; ZHANG,Xiaoming.
Abstract Hot melt extrusion technology using a twin-screw extruder was employed to obtain maltodextrin, maltodextrin-gum arabic and maltodextrin-trehalose based glassy extrudates containing ascorbic acid (dispersed phase). Ascorbic acid payload of all three formulations was more than 15.67 g/100 g extrudates while the ascorbic acid yield was above 97%. The glass transition temperature (Tg) of all extrudates was above 40 °C. The expansion ratio of the extrudates and Tg reduced due to the incorporation of trehalose and gum arabic to maltodextrins, respectively. The results of Scanning Electron Microscopy, X-ray diffraction and Fourier-transform Infrared Spectroscopy confirmed that the formulated feed material turned into a glassy state, whereas, ascorbic...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ascorbic acid; Encapsulation; Melt-extrusion; Maltodextrins; Glass transition temperature.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612019000300660
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Prediction of Mechanical Behaviour of a Bulk Epoxy Adhesive in a Marine Environment ArchiMer
Ilioni, Alin; Le Gac, Pierre-yves; Badulescu, Claudiu; Thévenet, David; Davies, Peter.
This article describes an approach to predict the behaviour of an epoxy adhesive in bulk form in a marine environment. First, the material, the experimental conditions and the predictive framework are described. Then the experimental results are presented, which indicate that the effects on yield stress of either a uniform water profile or elevated testing temperature can be shown to be equivalent when plotted versus T-Tg. Moreover, a discussion of these results shows how they can be used to predict changes in the mechanical properties of the adhesive. Prediction results for yield stress are in good agreement when they are compared with experimental results for the case of a water profile gradient, in order to evaluate the relevance and limitations of the...
Tipo: Text Palavras-chave: Epoxide; Water ageing; Glass transition temperature; Mechanical properties of adhesives; Plasticisation.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00419/53052/54052.pdf
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