Next Article in Journal
Film Thickness and Shape Evaluation in a Cam-Follower Line Contact with Digital Image Processing
Next Article in Special Issue
Tribological Anti-Wear and Extreme-Pressure Performance of Multifunctional Metal and Nonmetal Doped C-based Nanodots
Previous Article in Journal
Influence of Water on Tribolayer Growth When Lubricating Steel with a Fluorinated Phosphonium Dicyanamide Ionic Liquid
Previous Article in Special Issue
Tribological Properties of ZnS(NH2CH2CH2NH2)0.5 and ZnS as Additives in Lithium Grease
Open AccessArticle

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)
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
Show Figures

Graphical abstract

MDPI and ACS Style

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.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

Back to TopTop