Some model structures of waterborne polyurethane anionomers containing various amounts (ca. 3–20%) of a diol functionalized polyhedral oligomeric silsesquioxane (POSS) nanofiller were prepared. X-ray diffraction showed the formation of a nanocrystalline structure in all copolymers considered. Static contact angle measurements indicated a significant enhancement of surface hydrophobicity as well as reduction in surface tension components even at the least POSS level (3%). Dynamic contact angle cycles allowed the evaluation of the hysteresis, which was found to be large and kinetically increasing in POSS-modified samples. Film topography was analyzed by AFM, showing a more pronounced roughness in the nanostructured surface.
Wettability of POSS nanostructured surfaces
TURRI, STEFANO;LEVI, MARINELLA
2005-01-01
Abstract
Some model structures of waterborne polyurethane anionomers containing various amounts (ca. 3–20%) of a diol functionalized polyhedral oligomeric silsesquioxane (POSS) nanofiller were prepared. X-ray diffraction showed the formation of a nanocrystalline structure in all copolymers considered. Static contact angle measurements indicated a significant enhancement of surface hydrophobicity as well as reduction in surface tension components even at the least POSS level (3%). Dynamic contact angle cycles allowed the evaluation of the hysteresis, which was found to be large and kinetically increasing in POSS-modified samples. Film topography was analyzed by AFM, showing a more pronounced roughness in the nanostructured surface.| File | Dimensione | Formato | |
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Turri, macrom. rapid. comm, 2005.pdf
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