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Related Experiment Videos

Synthesis, solid-state structure, and surface properties of end-capped poly(L-lactide).

Yuka Kobori1, Tadahisa Iwata, Yoshiharu Doi

  • 1Polymer Chemistry Laboratory, RIKEN Institute, Hirosawa, Wako-shi, Saitama 351-0198, Japan.

Biomacromolecules
|March 9, 2004
PubMed
Summary

End-capped poly(L-lactide) (PLLA) films showed surface wettability dependent on their crystallization conditions. Chain end structure significantly influenced semicrystalline PLLA wettability, unlike amorphous PLLA.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Surface Science

Background:

  • Poly(L-lactide) (PLLA) is a biodegradable polymer with tunable properties.
  • Controlling polymer chain ends can modify material surface characteristics.
  • Understanding surface wettability is crucial for PLLA applications.

Purpose of the Study:

  • To synthesize end-capped PLLA with different ester groups.
  • To investigate the effect of chain end structure on PLLA film wettability.
  • To correlate wettability with crystallinity and morphology.

Main Methods:

  • Synthesis of end-capped PLLA via ring-opening polymerization.
  • NMR spectroscopy for confirming chain end substitution.
  • Advancing water contact angle measurements for wettability.

Related Experiment Videos

  • Differential scanning calorimetry (DSC) and X-ray diffraction (XRD) for crystallinity analysis.

    • Main Results:

    • Selective substitution of PLLA carboxylic acid chain ends with dodecyl or MEEE ester groups confirmed by NMR.
    • Amorphous PLLA films showed similar wettability regardless of chain end.
    • Semicrystalline PLLA wettability varied significantly with chain end structure.
    • Dodecyl ester end-capped PLLA wettability increased with crystallization temperature, correlating with increased crystallinity and lamellar thickness.

    Conclusions:

    • PLLA chain end segregation at the film surface is influenced by crystallization conditions.
    • The chemical nature of the chain end plays a critical role in the surface properties of semicrystalline PLLA.
    • Tailoring crystallization conditions offers a method to control PLLA surface wettability.