Abstract
Polypropylene/molybdenum disulfied (PP/MoS2) and Polypropylene/hexagonal boron nitride (PP/hBN) nanocomposites with varying concentration (0–6 wt %) were fabricated via in situ polymerization using two-dimensional (2D)-nanosheet/MgCl2-supported Ti-based Ziegler–Natta catalysts, which was prepared through a novel coagglomeration method. For catalyst preparation and interfacial interaction, MoS2 and hBN were modified with octadecylamine (ODA) and octyltriethoxysilane (OTES), respectively. Compared with those of pristine PP, thermal stability of composites was 70 °C higher and also tensile strength and Young’s modulus of the composites were up to 35% and 60% higher (even at small filler contents), respectively. The alkyl-modified 2D nanofillers were characterized by strong interfacial interactions between the nanofiller and the polymer matrix. The coagglomeration method employed in this work allows easy introduction and content manipulation of various 2D-nanosheets for the preparation of 2D-nanosheet/MgCl2-supported Ti-based Ziegler–Natta catalysts.
Highlights
MoS2 and hexagonal boron nitride (hBN) were modified with octadecylamine (ODA) and octyltriethoxysilane (OTES), respectively, for prevention of reaggregation and good compatibility with PP
Two-dimensional–nanosheet loadings of 0.3 wt % and 1.3–1.4 wt % yielded tensile strength increases of 18% and 34% as well as modulus increases of 13% and 58%, respectively, relative to the values of the neat PP. These results indicate the remarkable stiffness-toughness balance of PP/2D-nanosheet composites produced via the in situ polymerization method with 2D-nanosheets/MgCl2 /ID/TiCl4 catalysts prepared using a coagglomeration method
2020, 10, 596 modulus increases of 13% and 58%, respectively, relative to the values of the neat PP. These results indicate the remarkable stiffness-toughness balance of PP/2D-nanosheet composites produced via the in situ polymerization method with 2D-nanosheets/MgCl2/ID/TiCl4 catalysts prepared using a effect in the composites, owing to the well-dispersed 2D-nanosheets and good compatibility between
Summary
Layered two-dimensional (2D) nanosheet-based polymer composites have garnered considerable interest in the polymer industry due to their multifunctional properties including low density, high aspect ratio and specific surface area, excellent electrical/thermal conductivity, gas barrier properties, high permittivity, excellent mechanical properties including toughness and compressive strength, etc. [1,2,3,4] The graphene-based polyolefin nanocomposites are the most studied in the field of nanosheet-based polymer nanocomposites, owing to their significant potential and excellent physical properties [5,6,7].Among the 2D nanosheets, molybdenum disulfide (MoS2 ) and hexagonal boron nitride (hBN) have attracted significant attention [8,9,10,11,12]. [1,2,3,4] The graphene-based polyolefin nanocomposites are the most studied in the field of nanosheet-based polymer nanocomposites, owing to their significant potential and excellent physical properties [5,6,7]. A single layer of MoS2 has high breaking strength (~23 GPa) and Young’s modulus (~300 GPa), and hBN monolayer (like graphene) is characterized by excellent fracture strength (~70.0 GPa) and Young’s modulus (~0.8 TPa) [13,14]. Because of these fascinating properties, 2D-nanosheet was widely applied to the preparation of high-performance polymer nanocomposites. Polyolefins interact unfavorably with the inorganic MoS2 and hBN surfaces and incompatibility arises when these materials
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