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- W4211099891 abstract "Abstract Polymer morphology contains a uniquely detailed record of the history of a polymeric material, notably its crystallization and deformation, and has been the key to understanding the fundamental aspects of such behavior. Early understanding of chainfolded solution‐grown lamellae has now been extended to melt‐crystallized polymers with their characteristic spherulitic textures. Spherulites form because adjacent individual dominant lamellae branch repetitively then diverge from the branch points. The divergence is due to repulsion by (mostly transient) cilia supplemented, for faster growth, by the nonparallel packing of initially rough surfaces. The speed of growth has a major influence on crystallization. When it is slow, fold surface packing has time to optimize with minimal surface stress. For more typical faster growth, fold surfaces form rough and stressed leading, in tightly packed structures such as polyethylene, to twisted growth. The intrinsically different lamellar populations within spherulites, forming in different environments at different times produce an inherent, spatially varying, spread of properties. This is true of the final processed product as well as the starting material because the initial transverse sperulitic morphology is retained on drawing to very high extensions." @default.
- W4211099891 created "2022-02-13" @default.
- W4211099891 creator A5040296892 @default.
- W4211099891 date "2007-08-15" @default.
- W4211099891 modified "2023-10-14" @default.
- W4211099891 title "Morphology" @default.
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