The Experts below are selected from a list of 15 Experts worldwide ranked by ideXlab platform
Fritz Vollrath - One of the best experts on this subject based on the ideXlab platform.
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beta transition and Stress induced phase separation in the spinning of spider dragline silk
International Journal of Biological Macromolecules, 2000Co-Authors: David P Knight, M M Knight, Fritz VollrathAbstract:Spider dragline silk is formed as the result of a remarkable transformation in which an aqueous dope solution is rapidly converted into an insoluble protein filament with outstanding mechanical properties. Microscopy on the spinning duct in Nephila edulis spiders suggests that this transformation involves a Stress-induced formation of anti-parallel beta-sheets induced by extensional flow. Measurements of Draw Stress at different Draw rates during silking confirm that a Stress-induced phase transition occurs.
David P Knight - One of the best experts on this subject based on the ideXlab platform.
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beta transition and Stress induced phase separation in the spinning of spider dragline silk
International Journal of Biological Macromolecules, 2000Co-Authors: David P Knight, M M Knight, Fritz VollrathAbstract:Spider dragline silk is formed as the result of a remarkable transformation in which an aqueous dope solution is rapidly converted into an insoluble protein filament with outstanding mechanical properties. Microscopy on the spinning duct in Nephila edulis spiders suggests that this transformation involves a Stress-induced formation of anti-parallel beta-sheets induced by extensional flow. Measurements of Draw Stress at different Draw rates during silking confirm that a Stress-induced phase transition occurs.
M M Knight - One of the best experts on this subject based on the ideXlab platform.
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beta transition and Stress induced phase separation in the spinning of spider dragline silk
International Journal of Biological Macromolecules, 2000Co-Authors: David P Knight, M M Knight, Fritz VollrathAbstract:Spider dragline silk is formed as the result of a remarkable transformation in which an aqueous dope solution is rapidly converted into an insoluble protein filament with outstanding mechanical properties. Microscopy on the spinning duct in Nephila edulis spiders suggests that this transformation involves a Stress-induced formation of anti-parallel beta-sheets induced by extensional flow. Measurements of Draw Stress at different Draw rates during silking confirm that a Stress-induced phase transition occurs.
Kalyan Sehanobish - One of the best experts on this subject based on the ideXlab platform.
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cold Drawing necking behavior of polycarbonate as a double glass transition
Polymer Engineering and Science, 1995Co-Authors: Zhenwen Zhou, A Chudnovsky, C P Bosnyak, Kalyan SehanobishAbstract:The thermomechanical behavior of poly(bisphenol A carbonate) (PC) undergoing cold-Drawing (necking) over a large range of temperature and strain rate has been studied. The cold-Drawing of PC has been described from a material particle perspective in terms of true Stress and strain relationships. The isothermal Draw Stress is shown to be a material parameter, and the true Stress-strain behavior of necked material above the true Drawing Stress follows conventional treatment by rubber elasticity. Cold-Drawing is described as a double glass transition: first, a transition from an isotropic glass to an isotropic rubber at the yield point, then, on unloading after stretching of a rubbery mesophase, a transition from an oriented rubber to an oriented glass.
Alan J. Lesser - One of the best experts on this subject based on the ideXlab platform.
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influence of interchain forces and supermolecular structure on the Drawing behavior of nylon 66 fibers in the presence of supercritical carbon dioxide
Journal of Applied Polymer Science, 2004Co-Authors: Alan J. LesserAbstract:The Drawing behavior and mechanical properties of as-spun and highly oriented nylon 66 fibers Drawn in supercritical carbon dioxide (SCCO2) were investigated. Conditions including different temperatures, CO2 pressures, and plasticizers with different polarity were systematically studied. Results indicate that CO2 is an efficient plasticizer for as-spun nylon 66 fibers as shown by decreases in the Draw Stress. In contrast, CO2 shows only a slight influence on the Drawability of highly oriented nylon 66 fiber. The effect of other plasticizers such as water, methanol, and ethanol on the Drawability of nylon 66 fibers is very similar to that of CO2. Tenacity and modulus of one-stage Drawn fibers were less than 0.8 and 5.0 GPa, respectively. Fibers with the highest tenacity and modulus, 0.96/5.04 and 1.06/5.04 GPa, were obtained by two-stage Drawing in SCCO2 from as-spun and Drawn nylon 66 fibers, respectively. The main reason for the extremely low Draw ratios (<6.0) of nylon 66 fibers was the presence of hydrogen bonds in the crystalline phase. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 2282–2288, 2004
