Abstract
Abstract In recent years the formation of extended-chain crystals has received increasing attention, and a number of mechanisms for it have been proposed [1–5]. These mechanisms are classified into two groups, one being the thickening of folded-chain crystals [1, 2] and the other being the direct formation of extended-chain crystals from the melt [3–5]. In order to clarify the mechanism, it is necessary to study the microstructure of the isolated extended-chain crystals in detail. In this paper the isolation of the extended-chain crystals from high-pressure crystallized polyethylene by selective dissolution of folded-chain crystals is described.
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