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- W2084805612 abstract "When a small amount of chlorine atoms (0.4 and 1.7 Cl per 100 C) are substituted randomly for hydrogen in linear polyethylene, they act as foreign comonomer units which, under equilibrium conditions, will be selectively rejected from the crystalline phase. Under ordinary crystallization conditions, however, the rejection may not be a complete one if the growth front advances at a rate comparable to or faster than the segmental mobility required. In this work the amount of chlorine atoms thus trapped in the crystalline phase has been determined for samples cooled slowly and for those quenched rapidly from melt. The “invariant” or the total scattering power of the sample, determined by integration of small-angle X-ray intensities, is related to the contrast in the electron density between the crystalline and amorphous phases and also to the relative amounts of the two phases. The mass density of the sample is similarly related to the mass density contrast of the two phases and their relative amounts. The combined analysis of the X-ray and mass density data therefore affords determination of the partitioning between the two phases of chlorine atoms, which have higher electron and mass densities than the carbon and hydrogen atoms. For samples containing the same concentration of chlorine, the amount trapped in the crystalline phase is found to increase with faster crystallization rates, indicating that the time scale of segmental relaxation required for rejection of non-crystallizable units is comparable to the time scale of crystal growth. The small-angle X-ray data obtained are also analyzed to yield additional information on the lamellar morphology of the samples." @default.
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- W2084805612 date "1980-02-01" @default.
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- W2084805612 title "Partitioning of comonomer units between crystalline and amorphous phases of polyethylene: Effect of crystallization conditions" @default.
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- W2084805612 doi "https://doi.org/10.1016/0022-0248(80)90217-1" @default.
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