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Correlating polymer crystals via self-induced nucleation.

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Correlated polymer lamellae formation is controlled by a single primary lamella's branched morphology. Secondary lamellae nucleation density depends on primary branch width, revealing a new nucleation mechanism.

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Area of Science:

  • Polymer science
  • Materials science
  • Crystallization kinetics

Background:

  • Crystallizable polymers form stacked lamellae with correlated orientations.
  • The synchronization of nucleation events for these lamellae remains poorly understood.
  • Amorphous fold surfaces separate these ordered lamellar stacks.

Purpose of the Study:

  • To investigate the mechanism controlling correlated lamellar growth in polymers.
  • To determine the factors influencing the nucleation density of secondary lamellae.
  • To elucidate the role of primary lamellar morphology in polymer crystallization.

Main Methods:

  • Studying thin films of isotactic polystyrene.
  • Analyzing the relationship between primary lamellar branch width and secondary lamellae nucleation density.
  • Varying molecular weight, crystallization temperature, and film thickness to test independence.

Main Results:

  • The nucleation density of secondary lamellae (n(s)) is inversely proportional to the square of the primary lamellar branch width (w), i.e., n(s) ∼ w(-2).
  • This observed relationship is independent of molecular weight, crystallization temperature, and film thickness.
  • A novel nucleation mechanism involving polymer insertion into a branched primary lamellar crystal is proposed.

Conclusions:

  • The branched morphology of a single primary lamella dictates the formation of correlated lamellae.
  • Polymer insertion into primary lamellar branches is a plausible nucleation mechanism.
  • Understanding this mechanism offers insights into polymer crystallization control.