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首页> 外文期刊>ACS Macro Letters >Thermal Stability and Nucleation Efficacy of Shear-Induced Pointlike and Shishlike Crystallization Precursors
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Thermal Stability and Nucleation Efficacy of Shear-Induced Pointlike and Shishlike Crystallization Precursors

机译：剪切诱导的点状和硫样结晶前体的热稳定性和成核效果

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摘要

The different thermal stabilities of shear-induced pointlike and shishlike crystallization precursors of polyamide 11, generated in a parallel-plate rheometer and coexisting in the same sample, were quantified by hot-stage microscopy, by performing self-seed crystallization experiments. Crystals formed at low supercooling of the melt from these different types of precursors melt at about the same temperature. Annealing of the melt at different temperatures for a predefined time revealed dissolution/disordering of these precursors at 10-15 K higher temperature, near the equilibrium melting point. Despite their similar thermal stabilities, pointlike and shishlike crystallization precursors exhibit distinctly different nucleation efficacies. Under identical crystallization conditions, shishlike precursors cause faster crystallization than pointlike crystal nuclei. The faster crystallization of the shishlike nuclei can be explained, for example, by (a) the larger size of the shishlike precursors, providing numerous nucleation sites; (b) the more perfect chain conformation at the shish surface, which serves as a substrate for crystallization; or perhaps (c) the higher local orientation of the surrounding melt compared with molecular segments near pointlike nuclei, reducing the activation energy for crystallization.
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  • 来源
    《ACS Macro Letters》 |2021年第6期|共6页
  • 作者

    Jariyavidyanont Katalee; Janke Andreas; Tariq Muhammad; Di Lorenzo Maria Laura; Schick Christoph; Androsch Rene;

  • 作者单位

    Martin Luther Univ Halle Wittenberg Interdisciplinary Ctr Transfer Oriented Res Nat S D-06099 Halle Germany;

    Leibniz Inst Polymerforsch Dresden eV D-01069 Dresden Germany;

    Martin Luther Univ Halle Wittenberg Inst Phys D-06120 Halle Germany;

    Inst Polymers Composites &

    Biomat CNR I-80078 Naples Italy;

    Univ Rostock Inst Phys D-18051 Rostock Germany;

    Martin Luther Univ Halle Wittenberg Interdisciplinary Ctr Transfer Oriented Res Nat S D-06099 Halle Germany;

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  • 正文语种 eng
  • 中图分类 有机化学;
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