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Crystallization with Nodular Aggregation near the Glass Transition Temperature for Syndiotactic Polypropylene.

Takashi Konishi1, Ken Taguchi2, Koji Fukao3

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Syndiotactic polypropylene (sPP) crystallization near its glass transition temperature forms nodular aggregates. This homogeneous nucleation and growth process is fundamental for polymer crystallization at high supercooling.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Crystallization Kinetics

Background:

  • Understanding polymer crystallization mechanisms is crucial for material properties.
  • Syndiotactic polypropylene (sPP) exhibits complex crystallization behavior near its glass transition temperature.
  • Previous studies have explored sPP crystallization, but the specific mechanism involving nodular aggregation requires further elucidation.

Purpose of the Study:

  • To investigate the isothermal crystallization mechanism of syndiotactic polypropylene (sPP) from the melt state near the glass transition temperature.
  • To analyze the growth kinetics of aggregation regions formed during sPP crystallization.
  • To determine the fundamental crystallization process governing nodular aggregation in sPP.

Main Methods:

  • Wide-angle X-ray diffraction (WAXD) for crystalline structure analysis.
  • Small-angle X-ray scattering (SAXS) for analyzing aggregation regions and developing a scattering function for a three-component system.
  • Optical microscopy for visual observation of crystallization morphology.
  • Analysis of time-dependent structure factor combined with nucleation-and-growth kinetics models.

Main Results:

  • Crystallization near the glass transition temperature results in crystalline and mesomorphic nodules forming aggregation regions.
  • SAXS analysis suggests a suitable scattering function for the observed three-component system.
  • Growth kinetics analysis confirms homogeneous nucleation-and-growth for the aggregation regions.
  • The growth velocity of these aggregation regions extrapolates from spherulite growth at high supercooling.

Conclusions:

  • The crystallization of sPP near the glass transition temperature is characterized by nodular aggregation.
  • Homogeneous nucleation-and-growth kinetics govern the formation and expansion of these aggregation regions.
  • Nodular aggregation may represent a fundamental crystallization process for polymers near their glass transition temperature.