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Surface Functionalization of Metal-Organic Frameworks for Improved Moisture Resistance
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Biobased Polymer Coating Using Catechol Derivative Urushiol.

Hirohmi Watanabe1, Aya Fujimoto1, Jin Nishida1

  • 1Institute for Materials Chemistry and Engineering, Kyushu University , 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 15, 2016
PubMed
Summary
This summary is machine-generated.

We explored how hydrogenated urushiol (h-urushiol) affects the mechanical strength of urushiol coatings. Adding h-urushiol initially reduced strength but surprisingly increased it at high concentrations, offering insights for biomimetic coatings.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomaterials

Background:

  • Urushiol, a natural catechol derivative, forms robust coatings.
  • Understanding the structure-property relationships of urushiol-based materials is crucial for developing advanced coatings.
  • Hydrogenation of urushiol offers a route to modify its properties.

Purpose of the Study:

  • To investigate the mechanism behind the mechanical robustness of urushiol coatings.
  • To evaluate the impact of hydrogenated urushiol (h-urushiol) on the physical properties of urushiol thin films.
  • To explore the development of biomimetic catechol-based coatings.

Main Methods:

  • Synthesis of hydrogenated urushiol (h-urushiol) by hydrogenating double bonds in urushiol's alkyl chain.
  • Preparation and characterization of thin films from mixtures of urushiol and h-urushiol.
  • Surface morphology analysis using Atomic Force Microscopy (AFM).
  • Evaluation of mechanical properties including adhesive properties, curing time, strain-induced elastic buckling instability, and bulge tests.

Main Results:

  • Coated thin films exhibited homogeneous surfaces without phase separation, irrespective of h-urushiol content, due to structural similarity.
  • Films displayed good adhesive properties attributed to the catechol structure.
  • Curing time increased significantly with higher h-urushiol content (12h for pure h-urushiol vs. 10 min for urushiol).
  • Mechanical strength decreased with increasing h-urushiol content due to reduced cross-linking, but increased above 80 mol % h-urushiol.
  • The regular structure of saturated side chains in h-urushiol may enhance mechanical properties at high concentrations.

Conclusions:

  • The double bonds in urushiol's side chain are critical for rapid curing and high mechanical strength via cross-linking.
  • High concentrations of h-urushiol can lead to improved mechanical robustness, potentially due to ordered packing of saturated side chains.
  • Findings provide valuable insights for designing and developing novel biomimetic catechol-based coatings with tunable mechanical properties.