## Abstract The higher homologues for isotactic (it) poly(1‐alkylethylene)s (from it‐poly(1‐dodecylethylene) to it‐poly(1‐eicosylethylene)) show three polymorphic modifications. The modification of highest order crystallizes in an orthorhombic structure (modification I). This modification is formed
Haupt- und seitenkettenkristallinität bei isotaktischen poly(alkylethylen)en, 4. Die abhängigkeit des kristallinitätsgrades bei den höheren homologen von der thermischen vorbehandlung
✍ Scribed by Blum, Klaus ;Trafara, Gundolf
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1980
- Weight
- 388 KB
- Volume
- 181
- Category
- Article
- ISSN
- 0025-116X
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✦ Synopsis
Abstract
Crystallization of the higher homologues of poly(alkylethylene)s containing 12, 13, 14, 16 and 20 C‐atoms in the side chains is investigated varying the temperature and duration of crystallization. On cooling the samples slowly from the melt to about 5 to 10 K below the melting temperature, the modification is formed which was first reported by Turner‐Jones: The main chain conformation is a quaternary helix, the side‐chains crystallize by forming the orthorhombic polyethylene structure. Degrees of crystallinity were determined by X‐rays using the method of Hermans and Weidinger. The degree of crystallinity increases up to a limiting value with increasing duration of crystallization at constant temperature. The limiting value grows by increasing the number of C‐atoms in the side‐chains.
📜 SIMILAR VOLUMES
## Abstract Die Haupt‐ und Seitenkettenkristallinität bei den isotaktischen Poly(1‐alkyläthylen)en vom Poly(1‐dodecyläthylen) bis zum Poly(1‐eicosyläthylen) wurden thermoanalytisch und röntgenographisch untersucht. Die DSC‐Kurven der aus der Schmelze abgeschreckten Proben zeigen 3 Umwandlungspeaks