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| [1.] Mrs/Fragment 067 05 - Diskussion Zuletzt bearbeitet: 2015-05-16 19:25:35 WiseWoman | Fragment, Gesichtet, Mrs, Nairn 2007, SMWFragment, Schutzlevel sysop, Verschleierung |
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| Untersuchte Arbeit: Seite: 67, Zeilen: 5-12 |
Quelle: Nairn 2007 Seite(n): 7, Zeilen: 4ff |
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| Polymer molecular weight is important because it determines many physical properties. Some examples include the temperatures for transitions from liquids to waxes, to rubbers, to solids, and mechanical properties such as stiffness, tensile strength and elongation at break of fibers, as well as viscoelasticity, toughness, and viscosity. If molecular weight is too low, the transition temperatures and the mechanical properties will generally be too low for the polymer material to have any useful commercial applications. For a polymer to be useful it must have transition temperatures to waxes or liquids that are above room temperatures and it must have mechanical properties sufficient to bear design loads. | Polymer molecular weight is important because it determines many physical properties. Some examples include the temperatures for transitions from liquids to waxes to rubbers to solids and mechanical properties such as stiffness, strength, viscoelasticity, toughness, and viscosity. If molecular weight is too low, the transition temperatures and the mechanical properties will generally be too low for the polymer material to have any useful commercial applications. For a polymer to be useful it must have transition temperatures to waxes or liquids that are above room temperature (i.e., be a solid at room temperature) and it must have mechanical properties sufficient to bear design loads. |
The source is not mentioned. The passage can also be found in [1], a source from 2003 (PDF file properties), which, however, is difficult to cite. Note that the title of the chapter at the beginning of the page comes with the references "[245-248]", which however do not indicate that parts of the chapter are taken verbatim from somewhere else. [245] Collins, Edward A., Experiments in polymer science, Wiley, c 1973 [246] Billmeyer, Fred W., Textbook of polymer science,- 3. Ed, Wiley, 1984 [247] Harry. R. Allcock, F.W. Lampe, Contemporary Polymer Chemistry, Prentice-Hall 1981 [248] Kulicke, Werner-Michael. , Analysis of polymers : molar mass and molar mass distribution of polymers, polyelectrolytes and latices;, Basel : Hüthig & Wepf, 1992 |
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