Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1985. / Vita. Abstract. Includes bibliographical references (leaves 135-141). Also available via the Internet.

This study is aimed at extracting cellulose and nanocelluloses (cellulose nanocrystals (CNCs) and cellulose nanofibres (CNFs)) from maize stalks and flax fibres. Both flax fibres and maize stalks are composed of cellulose, lignin, hemicellulose and extractives. The extraction of cellulose involves the removal of lignin, hemicellulose and extractives. The presence of these components in plant fibres hinders the extraction of cellulose and nanocelluloses. Prior to extraction of cellulose, the different concentrations (1 wt.%, 1.5 wt.% and 2 wt.%) of NaOH were optimised. However, chemical compositions and XRD results revealed that the treatment of flax fibres with 1.5 wt.% sodium hydroxide (NaOH) gives optimum results and this concentration was further selected for the extraction of cellulose. Cellulose was extracted by chemical treatments (sodium hydroxide (NaOH), sodium chlorite (NaClO2) and potassium hydroxide (KOH)) and a combination of chemical treatments and mechanical process (supermass colloider). The materials obtained after each treatment stage during the extraction process were characterised by different characterisation techniques such as Fourier transform infrared (FTIR) spectroscopy, environmental scanning electron microscopy (ESEM), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The results from the aforementioned characterisation techniques confirmed that cellulose was successfully extracted from flax fibres and maize stalks. Cellulose nanocrystals (CNCs) were extracted by sulphuric acid hydrolysis accompanied with ultra-sonication from cellulose obtained from flax fibres and maize stalks. The extracted CNCs were rod-like material with diameters and lengths in nanoscale and microscale, respectively. On the other hand, cellulose nanofibres (CNFs) were extracted by mechanical process (supermass colloider). The extracted CNFs were web-like material with diameters and lengths in nanoscale and microscale, respectively. The dimensions of nanocelluloses were measured by atomic force microscopy (AFM). Their dispersion was investigated by light polarised microscopy. The extracted nanocelluloses and cellulose were used to produce nanopapers and micropaper. Nanopapers mimic the traditional paper, the only difference of the nanopapers is that they are produced from high aspect ratio nanomaterials. Both nanopapers and micropapers were prepared by solvent evaporating method. Their thermal, optical and mechanical properties were investigated and compared. The mechanical and thermal properties of nanopapers produced from CNFs were better than those produced from CNCs and micropapers. On the other hand, nanopapers produced from CNCs were more transparent in comparison to nanopapers produced from CNFs and micropapers. Cellulosic fibres have attracted a considerable attention in composite materials due to their high tensile strength and tensile modulus. This study is focused on the development of biocomposites of polyfurfuryl alcohol (PFA) by in-situ polymerisation in the presence of acid catalyst (p-toluene sulphonic acid). Biocomposites were produced by reinforcing PFA with flax fibres (untreated and treated), nanoparticles and CNCs. The biocomposites reinforced with CNCs and flax fibres showed an improvement in mechanical, thermal and thermo-mechanical properties. On the other hand, biocomposites reinforced with nanoparticles obtained from treated maize stalks showed an improvement in mechanical and thermal properties while biocomposites reinforced with nanoparticles obtained from untreated maize stalks showed lower mechanical properties and decreased thermal stability.

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Theatre is an art form that combines the art of storytelling with the visual arts. Every production begins with a blank canvas, and it is up to the director and a team of designers to discuss concepts and decide on an artistic vision for the piece. Skilled artisans work quickly as a team to produce the vision of the designer and director. During the production process waste is generated in the scene shop, props shop, costume shop, and rehearsal space. The products that are used to create the design can often contain harmful ingredients for both the artisan and the environment. No longer willing to ignore the responsibility that theatres have as stewards to the environment many artisans are leading the way by exploring safer practices and products. The research for this thesis is focused on the theatrical costume shop and examines dry cleaning, fabric painting and dyeing, and waste disposal. Alternatives to regular dry cleaning practices and commonly used and otherwise toxic products are available for a variety of processes we use in the theatre. For this study I conducted one hundred and sixty five surveys, ten interviews and a quality test amongst the dry cleaning alternatives in Austin, Texas. Three sets of seven different fabric samples were cleaned using the standard solvent and the alternative methods for dry cleaning. Four professional dyers and painters were interviewed about their dyeing process, disposal practices, and the impact that “green” products have on their work. I spoke with two experts working in wastewater about the impact dyes and paints have on wastewater treatment plants. Finally, I conducted an anonymous survey in 2010 to find out what new products or methods are in use amongst costume shop managers, dyers and painters, and production managers. / text

The purpose of this investigation was to characterize the effect of ozone upon a selected textile dyeing and finishing wastewater, with primary emphasis placed on noting the effect of ozone on the color of the wastewater. The parameters measured during the study included color, chemical and five-day biochemical oxygen demand, pH, dissolved oxygen, total organic carbon, ozone residual, total and suspended solids, and turbidity. The results of the investigation showed that color was removed to a significant degree from the selected wastewater by the action of ozone. Up to 80 percent of the original color of the wastewater was removed by ozonation. COD removals ranging from 20 to 30 percent were also measured. In addition, significant increases in the amounts of suspended solids and turbidity were noted to occur with increased ozonation. / Master of Science

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No description available.

New chemical substances being considered for use today are required by law to be evaluated for potential toxic effects upon disposal to the environment. A thorough evaluation, however, is complex, time-consuming, expensive, and impossible to perform on each new substance. In this study the potential toxic effects of a new carpet additive with antimicrobial properties and the associated process waste stream from a textile facility were considered. The wastewater from the rest of the plant was currently being treated in a land application disposal system. An assessment of the toxicity of the antimicrobial additive was made using conventional greenhouse studies. This assessment was compared to the results obtained from three short-term toxicity tests performed on the same set of solutions. The short-term tests used were a corn seedling bioassay, adenosine triphosphate measurements, and bacterial bioluminescence. These short-term tests were evaluated as to their utility as screening tools and as monitoring devices for toxic substances. / Master of Science