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- W2021001842 abstract "It has been shown that on solidification from the melt the radius of gyration (RW) of organic polymers does not change significantly. From this, one must conclude that any conformational changes on crystallization involve only fragments of the polymer chain, and that fragments of the same chain are distributed throughout several lamellae. It is not always possible to differentiate between a coiled molecule or a molecule consisting of an array of sets of stems within a crystal since at high molecular weight both structures shown an M1/2W dependence of RW. At low molecular weight the length of the stems which constitute t he array can be recovered. In polypropylene and quenched polyethylene this is shown to be approximately equal to twice the X-ray lamellar thickness (d) showing that rods which constitute the array contain two stems d and 2d in length. The latter act at tie molecules between lamellae. The structure is supported by chemical etching experiments which can differentiate between the tie molecules and folds in the amorphous phase and show the presence of two stems d and 2d in length in polypropylene and polyethylene. Finally, polypropylene, which is crystallized by “seeding”, folds fully in such a way as to preserve the tie molecules. The chain occupies two lamellae. Polyethylene crystallized under high pressure on the other hand, in which d≅2000Å, is fully folded and each lamellae contains complete polymer molecules. No evidence has been obtained for the nature of the re-entry in any of these structures. However, calculations by Yoon and Flory on scattering data obtained at higher angles show that irregular re-entry is more probable." @default.
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- W2021001842 title "Study of semi-crystalline macromolecules using neutron scattering" @default.
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- W2021001842 doi "https://doi.org/10.1016/0022-0248(80)90207-9" @default.
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