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 289 for “"formaldehyde"”.
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Formaldehyde mass-transfer properties study
Formaldehyde, an important feedstock in industrial processes and manufacture, is widely present in numerous consumer products. Emitted by many types of consumer products and indoor materials, indoor air can contain high concentrations of formaldehyde. Exposure to formaldehyde is hazardous to human …
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Production of phenol-formaldehyde resin composites
… of industrial laminates based on phenol-formaldehyde resins, with a view of suggesting ways of improving the process economics and/or the physical properties of the final product. Aspects of impregnation, drying, and lamination were investigated. The resins used in all experiments were …
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Simultaneous chemical reaction and distillation of formaldehyde
… in which the components react chemically. The formaldehyde-methanol-water system was selected and only the reversible reactions between formaldehyde and water giving methylene glycol and between formaldehyde and methanol producing hemiformal were assumed to occur under the distillation …
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The microwave absorption spectrum of deutero formaldehyde
Thesis (B.S.) Massachusetts Institute of Technology. Dept. of Physics, 1951.
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Spectroscopy and kinetics of highly excited formaldehyde
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1986.
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Evaluation of Phenol Formaldehyde Resin Cure Rate
… the cure rate of two commercial phenol-formaldehyde adhesives. Two methods are used, parallel-plate rheometry and dielectric spectroscopy. Viscosity data from a parallel-plate rheometer may be used to track the advance of polymerization as a function of temperature. This data can then be …
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Mechanisms of biogenic formaldehyde generation in wood
This work addresses biogenic formaldehyde (CH₂O) generated by wood during the manufacture of non-structural wood-based composites, from which CH₂O emissions are regulated. The target for regulation has been anthropogenic CH₂O released from hydrolytically unstable amino resins like …
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Organic Fillers in Phenol-Formaldehyde Wood Adhesives
… are typically manufactured using phenol-formaldehyde resols (PF) that are formulated with wheat flour extender and organic filler. Considering that this technology is several decades old, it is surprising to learn that many aspects of the formulation have not been the subject of detailed …
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Contact allergy to formaldehyde. Diagnosis and clinical relevance.
… people are exposed to them on a daily basis. Formaldehyde is one of the oldest and most commonly used preservatives. However, it is a well-known contact sensitiser in dermatitis patients. The aims of this work were: i) to investigate the prevalence of contact allergy to formaldehyde using the …
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Interaction of phenol-formaldehyde condensates with isoprene rubber
… the interaction between p-tertiary butyl phenol-formaldehyde condensates and isoprene rubber under conditions resembling those used in industrial vulcanization processes, and involves investigations of reaction rates, mechanisms of reactions and structures produced. The work is an extension of an …
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Isotope ratios in source determination of formaldehyde emissions
Formaldehyde emissions from non-structural wood composites are regulated and the regulation target is urea-formaldehyde (UF) resin. UF resins are hydrolytically unstable and constantly emit formaldehyde as a function of temperature and relative humidity. When heated, wood also generates …
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Resorcinol-formaldehyde/titania (RFTi) gel composites for wastewater treatment
… process via polycondensation of resorcinol-formaldehyde (RF), yielding unique properties that are ideal for use as an adsorbent for water treatment. TiO2 was successfully incorporated into the RF matrix during the polycondensation reaction of RF, to produce a chemically crosslinked, stable …
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Characterization and reduction of leakiness in melamine formaldehyde microcapsules
… with tackling three major challenges of melamine formaldehyde (MF) microcapsules for delivering of core materials: reducing the formaldehyde content in the formulation, modulate the mechanical properties and reducing the leakage of the core material through the microcapsules. Thus, to reduce the …
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Predicting an ultraviolet-tetraherz double resonance spectrum of formaldehyde
… (CaF), a double resonance spectrum of formaldehyde will be recorded. A dye laser will populate a level in formaldehyde's first electronically excited state, and pure rotational transitions will be induced by applying a terahertz electric field. A terahertz spectrometer has been built …
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A theoretical investigation of the excitation of interstellar formaldehyde.
Thesis: M.S., Massachusetts Institute of Technology, Department of Physics, 1971
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