Current Search: Polyethylene (x)
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Title
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I. The synthesis of organotin-modified poly(vinyl alcohol) for the inhibition of Candida albicans. II. The synthesis and structural characterization of titanocene-containing polyethers based on ethylene glycols.
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Creator
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Reckleben, Lisa., Florida Atlantic University, Carraher, Charles E.
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Abstract/Description
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Organotin-modified poly(vinyl alcohol) products and titanocene-containing polyethers were synthesized via the interfacial polymerization technique. The structures were determined using infrared and mass spectroscopy. Further characterization involved elemental analysis, thermal analysis, and solubility studies. For the organotin products, the biological activities towards selected microorganisms were determined. The products exhibited selective inhibition of Candida Albicans, the...
Show moreOrganotin-modified poly(vinyl alcohol) products and titanocene-containing polyethers were synthesized via the interfacial polymerization technique. The structures were determined using infrared and mass spectroscopy. Further characterization involved elemental analysis, thermal analysis, and solubility studies. For the organotin products, the biological activities towards selected microorganisms were determined. The products exhibited selective inhibition of Candida Albicans, the microorganism most responsible for yeast infections in man. The titanocene-containing polyethers exhibited flexibility when derived from longer chained polyethylene glycols, but were inflexible when shorter chained polyethylene glycols were used.
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Date Issued
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1991
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PURL
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http://purl.flvc.org/fcla/dt/14752
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Subject Headings
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Candida albicans, Organometallic polymers, Polymerization, Polyethylene glycol
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Format
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Document (PDF)
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Title
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Polyethylene duct cracking in post-tensioning tendons of Florida segmental bridges.
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Creator
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Suarez, Jorge Alejandro, Florida Atlantic University, Hartt, William H., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
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Abstract/Description
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For the purpose of investigating the cause of duct cracking in post-tensioning tendons and improving the durability of this type of structure, a series of experiments was performed. These were divided in two groups, the first to simulate the state of stress inside the tendon ducts and the second to compare the properties of new materials approved according to new regulations on the subject and those used in the construction of the structures. A proposed mechanism of cracking was studied and...
Show moreFor the purpose of investigating the cause of duct cracking in post-tensioning tendons and improving the durability of this type of structure, a series of experiments was performed. These were divided in two groups, the first to simulate the state of stress inside the tendon ducts and the second to compare the properties of new materials approved according to new regulations on the subject and those used in the construction of the structures. A proposed mechanism of cracking was studied and its validity verified. According to simulations performed on specimens that were fabricated and others developed by the finite element method, new major factors were found to explain the duct failure. Finally, a comparison of mechanical properties indicated a difference between virgin and aged materials.
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Date Issued
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2003
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PURL
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http://purl.flvc.org/fcla/dt/13071
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Subject Headings
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Post-tensioned prestressed concrete construction, Bridges--Florida, Polyethylene
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Format
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Document (PDF)