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A theory of the influence of branching on the crystallinity of bulk polyethylene

✍ Scribed by Des Cloizeaux, J.

Publisher
Wiley (John Wiley & Sons)
Year
1970
Tongue
English
Weight
565 KB
Volume
8
Category
Article
ISSN
0449-2978

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✦ Synopsis

Abstract

The temperature dependence of the crystallinity of bulk polyethylene is calculated in terms of branching (methyl or ethyl side groups on the chain). In the model, the chains are approximately parallel and they pass through alternating amorphous and crystalline layers forming a periodic structure. The crystalinity and the thicknesses of the layers are determined by minimization of the free energy. The theory shows that the temperature at which the polymer begins to crystallize is lower than the melting point of pure polyethylene and that the thicknesses of the layers becomes smaller as the temperature decreases.

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✍ Jen-taut Yeh; Huei-song Hong πŸ“‚ Article πŸ“… 1995 πŸ› John Wiley and Sons 🌐 English βš– 751 KB

## Abstract An investigation of the influence of the short‐chain branch length on the dynamic fatigue behavior of short‐chain branched polyethylenes (SBPE) is reported. The number of fatigue failure cycles (__N__~f~) increases significantly with increasing branch length at temperatures above the β‐