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Nanocomposite of Poly(l-Lactic Acid) with Inorganic Nanotubes of WS2

Department of Materials and Interfaces, Weizmann Institute, Rehovot 76100, Israel
Department of Chemical Research Support, Weizmann Institute, Rehovot 76100, Israel
Department of Materials Science and Engineering, Faculty of Engineering, Tel-Aviv University, Ramat Aviv, Tel Aviv 6997801, Israel
Author to whom correspondence should be addressed.
Lubricants 2019, 7(3), 28;
Received: 21 February 2019 / Revised: 17 March 2019 / Accepted: 20 March 2019 / Published: 25 March 2019
(This article belongs to the Special Issue Recent Research in Nanolubricants)
PDF [17310 KB, uploaded 25 March 2019]


Composites of poly(l-lactic acid) (PLLA) reinforced by adding inorganic nanotubes of tungsten disulfide (INT–WS2) were prepared by solvent casting. In addition to the pristine nanotubes, PLLA nanocomposites containing surface modified nanotubes were studied as well. Several surface-active agents, including polyethylene imine (PEI), were studied in this context. In addition, other biocompatible polymers, like poly d,l-lactic acid (PDLLA) and others were considered in combination with the INT–WS2. The nanotubes were added to the polymer in different proportions up to 3 wt %. The dispersion of the nanotubes in the nanocomposites were analyzed by several techniques, including X-ray tomography microscopy (Micro-XCT). Moreover, high-temperature rheological measurements of the molten polymer were conducted. In contrast to other nanoparticles, which lead to a considerable increase of the viscosity of the molten polymer, the WS2 nanotubes did not affect the viscosity significantly. They did not affect the complex viscosity of the molten PLLA phase, either. The mechanical and tribological properties of the nanocomposites were found to improve considerably by adding the nanotubes. A direct correlation was observed between the dispersion of the nanotubes in the polymer matrix and its mechanical properties. View Full-Text
Keywords: PLLA; solid lubricants; inorganic nanotubes PLLA; solid lubricants; inorganic nanotubes

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Shalom, H.; Sui, X.; Elianov, O.; Brumfeld, V.; Rosentsveig, R.; Pinkas, I.; Feldman, Y.; Kampf, N.; Wagner, H.; Lachman, N.; Tenne, R. Nanocomposite of Poly(l-Lactic Acid) with Inorganic Nanotubes of WS2. Lubricants 2019, 7, 28.

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