Journal
POLYMER
Volume 151, Issue -, Pages 242-249Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2018.07.060
Keywords
Polypropylene nanocomposite; Silica; Surface grafting; Melt strength
Categories
Funding
- National Natural Science Foundation of China [51403217, 51534007]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09030200]
- Youth Innovation Promotion Association CAS [2017041]
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Grafting polyolefin chains onto the surface of silica nanoparticles to form satisfactory polyolefin/silica nanocomposites still remains a challenge, even after the complicated functionalization of the polyolefin chains and surface modification of the silica. In this study, an efficient route for the preparation of polypropylene-grafted nanosilica (PP-g-SiO2) masterbatch was presented through the reactive melt blending of maleic-anhydride-grafted polypropylene (PP-MAH) and amino-functionalized silica (SN-NH2) synthesized by the co-condensation method. The amount of grafted PP chains could achieve to 80.8 wt%. And PP-g-SiO2 exhibited fine dispersion in PP matrix. The shear and extension rheology results of PP/PP-g-SiO2 nanocomposites showed that melt strength of PP could be enhanced remarkably by incorporation of PP-g-SiO2 masterbatch, which revealed the strong interactions between PP-g-SiO2 and PP matrix. These findings provide a facile way to prepare polyolefin-grafted nanosilica, while expanding the potential applications of nanosilica in polyolefin nanocomposites. (C) 2018 Elsevier Ltd. All rights reserved.
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