作者：Yongri Liang*, Shipeng Wen, Yanyan Ren, Li Liu*
關鍵字：iPP, Toughness, silica nanofibers
論文來源：期刊
具體來源：RSC Advances, 2015, 5, 31547-31553
發(fā)表時間：2015年
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.