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Fabrication of nanoprotrusion surface structured silica nanofibers for the improvement of the toughening of polypropylene
Fabrication of nanoprotrusion surface structured silica nanofibers for the improvement of the toughening of polypropylene
The toughening of semi-crystalline polymers with inorganic nanofiller is very important in the practical applications of such polymers. In this study, we successfully fabricated the surface attaching silica nanoparticles of silica nanofibers (SiO2@SNFs) from the calcination of electrospun poly(vinyl pyrrolidone)/tetraethyl orthosilicate/silica nanoparticle (PVP/TEOS/SiO2) nanofibers for the toughening of polypropylene (PP). The SiO2@SNFs had a nanoprotrusion structured surface, and the degree of surface nanoprotrusion of the silica nanofibers (SNF) can be adjusted via the incorporated SiO2 nanoparticle content of the SiO2@SNFs. The effects of the SiO2 content of the SiO2@SNFs on the crystallization
behavior, relative b-form crystal content, and mechanical properties of PP were investigated with polarized optical microscopy, X-ray diffraction and notched Izod impact test methods. By comparison with SNF, the SiO2@SNFs showed greater improvements in the impact strength and heterogeneous crystal nucleation of PP at the same loading content of filler. The impact strength of PP/SiO2@SNFs at a loading of 2 wt% of SiO2@SNFs with 9 phr (SiO2/TEOS ? 9/100) of SiO2 nanoparticles was improved by
about 1.9 and 1.4 times that of neat PP and PP/SNFs composite (2 wt% of SNFs), respectively. However, the crystallinity, relative b-form crystal content, and tensile strength of PP/SiO2@SNFs were almost independent of the SiO2 nanoparticle content of the SiO2@SNFs. Our results demonstrated that these
nanoprotrusion surface structured silica nanofibers can be used as a novel nanofiller for improving the toughening of PP.
