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- W2092134026 abstract "The study of polyethylene grown as row structures from linear nuclei has brought new contexts to polymer crystallization. First, there is a division between slower and faster growth. For slower growth, fold surfaces are initially ordered, as {201} facets, whereas for normal, faster growth, they form as {001} and then reorganize behind the growth front as they separate, thicken, and form S-profiled dominant lamellae in banded growth. Surface free energies for growth will thus be higher than those for melting. Second, faster and slower growth correspond to the time for molecules to order at the growth front, being, respectively, less than or greater than the time for radial advance. This time increases for longer and more-branched molecules. Third, the lamellar thickness at the growth front increases logarithmically with elapsed time, with the first formed lamellae being thinnest and melting first; in less congested conditions, lamellae must also thicken behind the growth front. Fourth, for linear polymer and slower growth, the radial advance increases from one constant rate to another once the lamellar separation exceeds the molecular length and internuclear interference is lost. For a branched polymer, segregation is an additional factor producing nonlinear growth and kinetic discontinuities when cellulation sets in and again when its pattern changes at the onset of banding. Fifth, banding is confined to faster growth for linear polyethylene but also occurs for slower growth in linear-low-density polymers, when initially ordered fold surfaces become stressed as isothermal thickening brings excluded branches deeper into fold surface regions." @default.
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- W2092134026 date "2003-01-08" @default.
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- W2092134026 title "New Contexts for Polymer Crystallization" @default.
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- W2092134026 doi "https://doi.org/10.1081/mb-120021599" @default.
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