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Aliphatic Polyurethane Elastomers Quaternized with Silane-Functionalized TiO2 Nanoparticles with UV-Shielding

Lenuta Stroea1, Andreea-Laura Chibac-Scutaru1, Violeta Melinte1

  • 1Polyaddition and Photochemistry Department, Petru Poni Institute of Macromolecular Chemistry, 41 A Grigore Ghica Voda Alley, 700487 Iasi, Romania.

Polymers
|April 30, 2021
PubMed
Summary

This study developed flexible polyurethane nanocomposites with titanium dioxide (TiO2) nanoparticles for enhanced UV protection. The novel covalent bonding strategy improved mechanical properties, creating promising UV-protective elastomeric coatings.

Keywords:
UV protectivemechanical propertiesnanocompositenanoparticlepolyurethanequaternization

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • High-performance nanocomposites offer improved properties over base polymers for diverse applications.
  • Polyurethane (PU) elastomers are versatile materials, but their properties can be further enhanced with nanofillers.
  • Titanium dioxide (TiO2) nanoparticles are known for their unique optical and mechanical properties.

Purpose of the Study:

  • To prepare and characterize novel polyurethane-TiO2 nanocomposites.
  • To investigate the effect of surface modification and covalent bonding of TiO2 nanoparticles on PU properties.
  • To evaluate the potential of these nanocomposites as UV-protective coatings.

Main Methods:

  • Surface modification of TiO2 nanoparticles using (3-iodopropyl) trimethoxysilane.
  • Quaternization of PU hard segments with silane-modified TiO2 to achieve covalent binding.
  • Characterization using FTIR, XRD, SEM, contact angle, TGA, DMTA, and tensile testing.
  • UV-Vis absorbance/transmittance measurements.

Main Results:

  • Successful covalent attachment of TiO2 nanoparticles to PU chains was confirmed.
  • The resulting nanocomposites exhibited excellent elastomeric properties and flexibility.
  • The PU/TiO2 thin films demonstrated significant blocking of UV-A and UV-B radiation.

Conclusions:

  • The developed method effectively integrates TiO2 nanoparticles into PU elastomers, enhancing their properties.
  • These nanocomposites show potential for use as durable, flexible, and UV-protective coatings.
  • The covalent bonding strategy is crucial for achieving high-performance polymer nanocomposites.