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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 81 for “"isoprene"”.
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Isoprene Degradation in the Terrestrial Environment
Isoprene production comprises of one third of the total global hydrocarbon release, and influences atmospheric chemistry, including increasing global temperatures and raising ozone concentrations. Although isoprene production, and the chemical attenuation of isoprene have been well studied, …
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Molecular ecology of marine isoprene degradation
Isoprene is an atmospheric trace gas whose emissions to the atmosphere are roughly equal to that of methane. It is highly reactive and has the potential to affect climate through a variety of interactions in the atmosphere, including the formation of ozone. In the marine environment alone, algae …
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OPTIMIZATION AND CHARACTERIZATION OF SELF-ASSEMBLED POLY(STYRENE-B-(3,4-ISOPRENE-STAT-1,2-ISOPRENE) BLOCK COPOLYMER THIN FILMS
… chemically. In this work, a poly(styrene-b-(3,4-isoprene-stat-1,2-isoprene) (PS-b-(3,4-PI-stat-1,2-PI)) thin film system was developed, optimized and characterized by atomic force microscopy (AFM). Stable PS-b-(3,4-PI-stat-1,2-PI) thin films in an aqueous environment were achieved via substrate …
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Interaction of phenol-formaldehyde condensates with isoprene rubber
… 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 earlier study (A. Fitch, …
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Bacterial Degradation of Isoprene in the Terrestrial Environment
Isoprene is a climate active gas emitted from natural and anthropogenic sources in quantities equivalent to the global methane flux to the atmosphere. 90 % of the emitted isoprene is produced enzymatically in the chloroplast of terrestrial plants from dimethylallyl pyrophosphate via the …
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Electronic Spectroscopy, Photochemistry, And Reactivity Of Isoprene-Derived Criegee Intermediates
… known as Criegee intermediates. Ozonolysis of isoprene, the most abundant non-methane volatile organic compound emitted into the atmosphere, can generate three distinct Criegee intermediates: formaldehyde oxide (CH2OO), methyl vinyl ketone oxide (MVK-oxide), and methacrolein oxide (MACR-oxide). …
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Forest Isoprene Emissions: New Insights from a Novel Field Instrument
Isoprene is an important biogenic volatile organic compound (VOC) in natural systems. Its emission by certain species of plants depends on solar radiation levels and on temperature, as well as other factors. Once in the atmosphere, it is rapidly transported and oxidised, and the subsequent …
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Structure-Property Relationships of Isoprene-Sodium Styrene Sulfonate Elastomeric Ionomers
… An ionomer that has been studied is that of isoprene copolymerized with sodium styrene sulfonate (poly(I-co-NaSS)). Research has been performed relating to the synthesis and chemical characterization of the copolymers. However, an in depth study of the way the physical properties are affected …
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Aminopyridinato-Ligand-Stabilized Lanthanoid Complexes: Synthesis, Reactivity, Ethylene and Isoprene Polymerization
… for the polymerization of ethylene or isoprene und their ability to form hydrido complexes or cations. Previous investigations carried out in our group have shown that aminopyridinate-stabilized organoyttrium cations exhibit very high activity in the polymerization of ethylene in the …
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Morophology and mechanical behavior of oriented blends of styrene-isoprene-styrene triblock copolymer and mineral oil
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1997.
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Synthesis and characterization of linear and star-branched butadiene-isoprene block copolymers and their hydrogenated derivatives
… block copolymers based on butadiene and isoprene. Sequential anionic addition techniques initiated by homogeneous organolithium species in hydrocarbon solvents were employed to prepare several series of butadiene-isoprene copolymers varying in block size and architecture. Linear A–B–A …
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Mass spectrometric investigation of the OH induced oxidation of isoprene using 0 2 + as a chemical ionization reagent
Isoprene (2-methyl-1,3-butadiene) is a dominant non-methane organic compound emitted into the atmosphere by vegetation, with an annual global emission rate of 500 Tg/yr. It represents almost 50% of all biogenic non-methane hydrocarbons on a global scale. It has a substantial impact on troposphere …
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Metabolic engineering of xylose-fermenting saccharomyces cerevisiae for bioisoprene production
… synthetic rubber, it is incumbent on obtaining isoprene -monomer of synthetic rubber. Building block of synthetic rubber, isoprene can be produced by three different ways including chemical and petrochemical production. Apart from the methods of isoprene production abovementioned, biological …
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Simulating the Effects of Hydroclimate Stress on BVOC-Chemistry-Climate Interactions in NASA GISS ModelE
… level and how drought stress impacts vegetative isoprene emissions and their impact on atmospheric composition and climate, as isoprene is the dominantly emitted BVOC and is a precursor to ozone (O3) and secondary organic aerosols (SOA). In the second chapter, the implementation of isoprene …
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The production of non-methane hydrocarbons by marine plankton
… many alkenes, and a phytoplanktonic source for isoprene. The focus of this thesis was to gain further insight on marine microbiological cycling of NMHC. This included investigations on two main themes. The first was the effect of different physiological conditions on phytoplanktonic isoprene …
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Leaf Volatile Emissions Structure Tree Community Assembly and Mediate Climate Feedbacks in Tropical Forests
… is a current research priority. The emission of isoprene gas from plant leaves has been demonstrated to enhance leaf tolerance to high temperatures and drought. Isoprene is a volatile secondary metabolite produced in the chloroplast by approximately one-third of plant species. While the benefits …
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Biodegradation of Volatile Hydrocarbons in Estuarine Environments
Benzene, toluene, isoprene, ethane and propane are volatile organic compounds (VOCs) commonly found in estuarine environments. Benzene and toluene are toxic and carcinogenic at varying concentrations. Isoprene, ethane and propane are emitted from marine environments to the atmosphere where they can …
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Modelling Climate Changes, Biogenic Emissions and Tropospheric Chemistry in Southeast Asia.
… the CO2 activity factor, showed an increase in isoprene emissions by 27% (A2) and 13% (B2) in 2100 relative to 2008. In the same scenario, but with the inclusion of future CO2 concentrations of 560 ppm, isoprene emissions were found to be inhibited by 8% (A2) and 19% (B2) respectively. The …
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Fundamental adhesive studies of block copolymers
… on modern adhesion technology. Styrene and isoprene based block copolymers were investigated 511 order to understand their adhesive properties. The structure of the microphase separated morphology of the materials studied was found to influence the adhesive behavior in applications as hot …
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