Abstract
Grafting terminally functionalized polypropylene (PP) to nanofillers provides well-defined PP-based nanocomposites plausibly featured with a physical cross-linkage structure. In this paper, a series of PP-grafted silica nanoparticles (PP-g-SiO2) were synthesized by varying the number of grafted chains per silica particle, and influences of the number and the molecular weight of grafted chains were studied on physical properties of PP/PP-g-SiO2 nanocomposites. We found that only 20–30 chain/particle was sufficient to exploit benefits of the PP grafting for the nanoparticle dispersion, the nucleation, and the Young’s modulus. Meanwhile, the yield strength was sensitive to both of the number and the molecular weight of grafted PP: Grafting longer chains at a higher density led to greater reinforcement.
Highlights
Growing production and applications of polymer materials have owed much to a variety of compounding technologies
The key issue for formulating PP-based nanocomposites is how to overcome poor compatibility and weak interfacial bonding arising from the chemical inertness of PP
Starting from PP-t-OH with well-defined primary structures, a series of PP-g-SiOa2 series of PP-g-SiO2 nanoparticles were synthesized, and materials design for PP-g-SiO2 was comprehensively studied on physical properties of PP/PP-g-SiO2 nanocomposites
Summary
Growing production and applications of polymer materials have owed much to a variety of compounding technologies. The key issue for formulating PP-based nanocomposites is how to overcome poor compatibility and weak interfacial bonding arising from the chemical inertness of PP. The former is relevant to the dispersion of nanofillers in PP matrices, while the latter is important for load transfer to nanofillers [22]
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