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- W1504198178 abstract "Single crystals of five low molecular weight and one high m. w. fractions of Poly(ethylene-oxide) were grown isothermally from the supercooled melt using the self seeding procedure. Growth was arrested by rapid quenching of the specimens, which gives rise to highly contrasted outgrowths decorating all the nucleating sites of the crystals, whereas the homogeneously nucleated melt remains optically transparent. This self-decorating procedure delineates the crystal edges and outlines the surface roughness of the lamellae. The surface decoration contrast allows to distinguish between lamellae constituted by folded and fully extended chains. For the five low m. w. fractions the temperature coefficient of the growth rate,G, undergoes at least one sharp transition which can be interpreted by the stepwise variation of the thickness of growing lamellae with crystallization temperature,T c . For each fraction the transition from extended chain to folded chain crystal growth is extremely sharp and it is accompanied by a radical change in the crystal habit and the surface texture of the lamellae. Chain folded lamellae thicken isothermally during their growth, provided they are surrounded by molten polymer. This isothermal extension of chains can be detected morphologically. It involves two different molecular mechanisms: a nucleation process characterized by incubation periodτ and a growth process characterized by a rateGΦ. Both of these parameters depend strongly onT c and molecular weight. All these features are discussed and tentatively interpreted in terms of kinetic theories of polymer crystal growth." @default.
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- W1504198178 date "1972-01-01" @default.
- W1504198178 modified "2023-10-16" @default.
- W1504198178 title "Crystallization and fusion of self-seeded polymers" @default.
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- W1504198178 doi "https://doi.org/10.1007/978-3-642-47049-3_3" @default.
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