Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Abstract Historically most of the effort in obtaining highly oriented polymer samples has been concentrated upon trying to uncoil and align long polymer molecules in the solid state, melt or solution. A variety of techniques have been employed with conventional polymers, e.g. polyethylene, such as ultra-drawing,1–3 high degrees of extrusion1–3 and gel or solution spinning.6,7 New rigid-rod polymers have also been developed from which highly oriented fibres can be prepared by the spinning of liquid crystalline solutions.8–10 Although significant improvements and developments have taken place over recent years and samples with high values of modulus and strength have been prepared, perfect molecular alignment as in single crystals is never achieved using such approaches since defects such as chain-ends, chain-folds, loop and entanglements are invariably trapped in the structures.
Abstract Historically most of the effort in obtaining highly oriented polymer samples has been concentrated upon trying to uncoil and align long polymer molecules in the solid state, melt or solution. A variety of techniques have been employed with conventional polymers, e.g. polyethylene, such as ultra-drawing,1–3 high degrees of extrusion1–3 and gel or solution spinning.6,7 New rigid-rod polymers have also been developed from which highly oriented fibres can be prepared by the spinning of liquid crystalline solutions.8–10 Although significant improvements and developments have taken place over recent years and samples with high values of modulus and strength have been prepared, perfect molecular alignment as in single crystals is never achieved using such approaches since defects such as chain-ends, chain-folds, loop and entanglements are invariably trapped in the structures.
Polymer Single Crystal Fibres
Young, Robert J. (Autor:in)
01.01.1987
38 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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