Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Abstract Many polymers can crystallise to form regular structures despite their large molecular size. The arrangement will often be with the axis of a polymer chain aligned along one of the crystal axes of the unit cell. The unit cell will usually contain only a small fraction of one or more polymer molecules, the repeat unit being a few monomers. The structure of polymer crystals can be determined by the usual techniques of x-ray, electron or neutron diffraction (see X-ray Scattering Methods). There are several distinctive features of polymer crystals that deserve mention. Very few polymers will crystallise completely, particularly from melts where the molecules are initially highly entangled. The usual structure is referred to as semi-crystalline in which there are some regular crystals separated by amorphous regions. The study of the arrangement and growth of crystals in their distinctive morphologies is particular to polymeric materials1.
Abstract Many polymers can crystallise to form regular structures despite their large molecular size. The arrangement will often be with the axis of a polymer chain aligned along one of the crystal axes of the unit cell. The unit cell will usually contain only a small fraction of one or more polymer molecules, the repeat unit being a few monomers. The structure of polymer crystals can be determined by the usual techniques of x-ray, electron or neutron diffraction (see X-ray Scattering Methods). There are several distinctive features of polymer crystals that deserve mention. Very few polymers will crystallise completely, particularly from melts where the molecules are initially highly entangled. The usual structure is referred to as semi-crystalline in which there are some regular crystals separated by amorphous regions. The study of the arrangement and growth of crystals in their distinctive morphologies is particular to polymeric materials1.
Crystalline Polymers
Rennie, A. R. (Autor:in)
01.01.1999
2 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
| Springer Verlag | 1999
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