RT Journal Article
T1 Airbrushed Polysulfone (PSF)/Hydroxyapatite (HA) Nanocomposites: Effect of the Presence of Nanoparticles on Mechanical Behavior
A1 Moradienayat, Monireh
A1 Olmos Díaz, Dania
A1 González Benito, Francisco Javier
AB Nanocomposite films of polysulfone (PSF)—hydroxyapatite (HA) were prepared with acommercial airbrush. Structural, thermal, and mechanical characterization allows obtaining new informationto understand the role of the nanofiller–polymer matrix interphase in the final performanceof these materials in relation to its possible applications in the restoration of bones. Fourier-transforminfrared spectroscopy shows that there are hardly any structural changes in the polymer when addingHA particles. From thermal analysis (differential scanning calorimetry and thermogravimetry), it canbe highlighted that the presence of HA does not significantly affect the glass transition temperatureof the PSF but decelerates its thermal degradation. All this information points out that any change inthe PSF performance because of the addition of HA particles cannot be due to specific interactionsbetween the filler and the polymer. Results obtained from uniaxial tensile tests indicate that the additionof small amounts of HA particles (1% wt) leads to elastic moduli higher than the upper boundpredicted by the rule of mixtures suggesting there must be a high contribution of the interphase. Asimple model of the nanocomposite is proposed for which three contributions must be considered,particles, interphase and matrix, in such a way that interphases arising from different particles caninteract by combining with each other thus leading to a decrease in its global contribution whenthe amount of particles is high enough. The mechanical behavior can be explained considering abalance between the contribution of the interphase and the number of particles. Finally, a particularmechanism is proposed to explain why in certain nanocomposites relatively high concentrations ofnanoparticles may substantially increase the strain to failure.
PB MDPI AG
SN 2073-4360
YR 2022
FD 2022-02-15
LK https://hdl.handle.net/10016/35254
UL https://hdl.handle.net/10016/35254
LA eng
NO The authors wish to acknowledge financial support from Fondos de Investigación de Fco.,Javier González Benito, política de reinversión de costes generales, Universidad Carlos III de Madrid(2012/00130/004), Acción Estratégica en Materiales Compuestos Poliméricos e Interfases, UniversidadCarlos III de Madrid (2011/00287/002) and Adquisición de un microscopio electrónico de barridode emisión de campo y ambiental (FEDER) (2013/00540/001), and project number 2020/00355/001from CAM (Comunidad Autónoma de Madrid). This work has been supported by Comunidad deMadrid (Spain) multiannual agreement with UC3M (“Excelencia para el Profesorado Universitario”-EPUC3M04) fifth regional research plan 2016–2020.
DS e-Archivo
RD 1 jul. 2024