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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Spectroscopy

Background:

  • Infrared (IR) imaging provides chemical specificity and 3D molecular orientation data.
  • Super-resolution optical photothermal infrared (O-PTIR) spectroscopy enhances IR capabilities.
  • Understanding macromolecular organization is crucial for materials properties.

Purpose of the Study:

  • To track the 3D macromolecular organization in PLLA spherulites using advanced IR techniques.
  • To investigate the impact of crystallization conditions on polymer structure and morphology.
  • To establish O-PTIR microscopy as a tool for studying structural changes.

Main Methods:

  • Utilized linearly polarized IR excitation with a rapid computational algorithm.
  • Applied O-PTIR microscopy to analyze PLLA/PEG films under varying crystallization conditions.
  • Determined 3D molecular orientation from two nonparallel absorption bands.

Main Results:

  • Different spherulite formation pathways were observed based on crystallization conditions.
  • Plasticizers facilitated crystallization but disrupted molecular organization and induced secondary crystallization.
  • Lamellar branching was identified as a consequence of plasticizer-induced changes.

Conclusions:

  • High-resolution O-PTIR microscopy offers a powerful, diffraction-limit-independent method for analyzing complex polymer systems.
  • The technique facilitates studies on structural changes and morphology-property relationships.
  • It provides unprecedented tracking of 3D macromolecular organization in materials science and biology.