Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 591 for “"phenolic"”.
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THE DURABILITY OF PHENOLIC ADHESIVES
… was to study the superior durability claimed for phenolic-based adhesives, in hot humid conditions. The systems under study were the nitrile-phenolics AF-10 and AF-30 (3M), the vinyl-phenolic Redux 775 and the modified epoxide Redux 312 (Ciba-Geigy). The AF-30 structural adhesive was used with and …
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The photocatalytic degradation of phenolic compounds
Semiconductor photocatalysis degrades phenolic pollutants to carbon dioxide and water, but the mechanisms of this potentially attractive method of environmental remediation remain unclear. This study aimed to elucidate the primary molecular events by HPLC analysis of the initial products of …
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Aging in closed-cell phenolic foam
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1986.
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Phenolic reactions for leather tanning and dyeing
… mechanism of lignin peroxidase to produce phenolic compounds. The degradation products were identified using spectroscopic methods and gas chromatography-mass spectrometry. 2-methoxyphenol, 4-hydroxybenzaldehyde, vanillin and vanillic acid were produced and their formaldehyde polymerisation …
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Interactions of Phenolic Monomers With Digestion and Metabolism
Phenolic monomer content of alfalfa hay, soybean stover, smooth bromegrass hay and ensiled cornstalks was determined. High-pressure liquid chromatography was used to identify and quantitate p-coumaric, ferulic, gallic, p-hydroxybenzoic, protocatechuic, salicyclic, syringic and vanillic acids, and …
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Bioremediation of Phenolic Compounds in Circulating Packed Bed Bioreactor
Wastewaters containing phenolic compounds such as phenol and cresols pose a high risk to human health and natural environment. Compared to physicochemical methods, bioremediation is an attractive alternative for removal of phenolic compounds from contaminated waters. This research aimed to evaluate …
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Anti-Inflammatory Properties of Blackberry Phenolic and Volatile Compounds
… have been linked to high concentrations of phenolic compounds, especially anthocyanins. However, the present study hypothesized that volatiles could contribute to the berries’ bioactive properties. Thus, the objectives of this research are to profile the phenolic and volatile composition of …
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Effects of Reduced Phenolic Acids on Ruminant Hepatic Metabolism
… these compounds probably is derived from dietary phenolic monomers. Reduced forms of phenolic monomers have been identified previously in ruminal fluid. The effects of four reduced phenolics, benzoic (BA), 3-phenylpropionic (PPA), trans-cinnamic (CA), and 3-(4-hydroxyphenyl)propionic (4OHPPA) …
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Rheology And Organic Filler Interactions in Phenolic Resin Formulations
Phenol formaldehyde (PF) is the oldest known synthetic polymer. This polymer has seen many applications throughout history, including jewelry, electric wire insulation, and resins used to make adhesives. Today, PF resins are still crucial components used in the wood products industry. These PF …
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Void-Free Flame Retardant Phenolic Networks: Properties and Processability
Phenolic resins are important components of the composite industry because of their excellent flame retardance and cost effectiveness. However, the common procedure for curing phenolic novolac resins uses hexamethylenetetramine (HMTA) and releases volatiles during the cure, which produce networks …
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An analysis of the spallation of carbon phenolic ablators
… investigated as it occurs in carbon-reinforced phenolic ablators. Spallation is shown to be the result of a pressure buildup within the char. This pressure increase results from occlusion of the char and the consequent blockage of now. By selective fiber orientation, the spallation process can …
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A scheme for the identification of phenolic compounds and aldehydes
Thesis (M.A.)--Boston University
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Optimizing the Extraction of Phenolic Antioxidant Compounds from Peanut Skins
… have been shown to contain significant levels of phenolic compounds with demonstrated antioxidant properties. The effects of two types of extraction methods: solid-liquid extraction (SLE) and microwave-assisted extraction (MAE) on the recovery of phenolic compounds from peanut skins were …
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Identification of Phenolic Compounds from Peanut Skin using HPLC-MSn
… chromatography (SEC) was used for separating phenolic size-classes in raw methanolic extract from skins of Gregory peanuts. This allowed for an enhanced analysis of phenolic content and antioxidant activity based on compound classes, and provided a viable preparatory separation technique for …
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Phenolic compounds from selected Namibian leafy vegetables (NLV); extraction and characterization
… Namibian Leafy Vegetables (NLV), using Total Phenolic Content (TPC), Total Flavonoid contents (TFC) as well as Diphenyl-1-picrylhydrazyl (DPPH), 2,2-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS), and Reducing Power (RP) assays. The study also aimed at detecting and characterizing …
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Development of polyaniline nanotube electrocatalysts and sesor devices for phenolic-pollutants
As a source of life, water is one of the most precious commodities for all living organisms. Water resources are reported to be declining in numbers or the amount of water present and the existing onses are being polluted as a result of negligent human activities and intense industrialisation. …
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Analysis of phenolic compounds by dint of GDH-biosensors and immunoassays
In den letzten Jahren gerieten phenolische Substanzen, wie z.B. Chlor-, Nitrophenol oder Alkylphenolethoxylate aufgrund ihrer Toxizität sowie ihres kanzerogenen und endokrinen Potentials in das Interesse der Öffentlichkeit. Diese Substanzen gelangen in großen Mengen, z.B. aus industriellen …
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Phenolic composition and antioxidant activity of sweetpotatoes [Ipomoea batatas (L.) Lam]
The influence of numerous factors on sweetpotato phenolic content and antioxidant activity was determined. Simplified, robust, and rapid methodologies were developed to quantify total phenolics and individual phenolic acids in sweetpotatoes. Quantification of total phenolic content using …
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