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The plastic bag used in the packaging of mozzarella cheese was characterized, for which the quality of the bag was evaluated through its identification by the method of solubility in organic and inorganic solvents, the quality of sealing by the colorful solution method, the determination of the speed of transmission to water vapor by the method gravimetric, dimensions and thickness. The results of the functional length and width presented average values of 396 mm and 374 mm respectively, the material proved to be made up of two flexible layers with a total thickness of 67.17 μm; an inner layer of polyethylene with a thickness of 47 μm and an outer layer of polyester with a thickness of 21 μm. The transmission speed to water vapor of the container was 2.33 g/m2d. [ABSTRACT FROM AUTHOR]

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Introduction: Alkaline treatments extract hemicellulose from the fibers, which can be reused in the manufacture of other materials, and the cellulosic portion can be applied as reinforcement in a composite. This way, all components of the fibers are utilized. Method: In this work, curaua fibers (Ananas erectifolius) were treated with potassium hydroxide (KOH) to solubilize part of the hemicellulose and lignin, and the cellulose-rich fibers were used to manufacture composites with unsaturated polyester, which were characterized to investigate the effect of the treatment on their properties. Results: The alkaline treatment removed large portions of hemicellulose and significantly degraded the crystalline cellulose and lignin, resulting in a small increase (2.4%) in overall crystallinity and with a negative impact on their thermal stability. SEM images showed defibrillation of the treated fiber and fibril separation, increasing roughness and surface contact area. Conclusions: In all, although the alkaline treatment substantially modified the fibers and no significant changes were observed in the mechanical properties of the composite, the total removal of hemicellulose was found to affect the integrity of cellulose fibers making harder their application as reinforcement. However, the higher cellulose content could be useful for other applications. [ABSTRACT FROM AUTHOR]

Films of TiO2 and of TiO2/SiO2 were supported on polyester granules using a diffusion mechanism and a posterior thermal treatment to 100°C. Two kinds of gels were used. The first one was prepared using different amounts of TiO2, methylene chloride and liquid silicone. The second one used the solgel method to produce a silica matrix by adding tetraethyl orthosilicate, water and 2- propanol. After that the photocatalyst was dispersed in the gel. The precursors of each system were added in different amounts to determine their influence in the stability, properties and photoactivity of the films. The photocatalytic activity was tested in the methanol photodegradation in gas phase. The results show the production of materials with high resistance, functionality and activity as well as a strong dependence between the photocatalityc activity and efficiency with the physicochemical properties of the films. [ABSTRACT FROM AUTHOR]

The support by sol-gel of titanium dioxide appears on polyester fibers using the immersion-diffusion method, using different times of impregnation to determine its effect in the characteristics of the obtained coating. The supported samples were characterized by Scanning Electron Microscopy (SEM), X-Ray Energy Dispersive Spectrometer (EDS), Optical Microscopy (MO) and Fourier Transform Infrared Spectroscopy - Attenuated Total Reflection (FTIR- ATR). The results showed the presence of TiO2 in all prepared systems and different characteristic from the coatings, being the covering obtained to 11 hours the one that displays the best morphologic and structural characteristics. [ABSTRACT FROM AUTHOR]

Copyright of Boletin Intexter del Instituto de Investigacion Textil y Cooperacion Industrial Terrassa is the property of Universitat Politecnica de Catalunya and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)