TY - JOUR
T1 - Tuning the Structure and Ionic Interactions in a Thermochemically Stable Hybrid Layered Titanate-Based Nanocomposite for High Temperature Solid Lubrication
AU - Gonzalez Rodriguez, P.
AU - Lubbers, Roy
AU - Veldhuis, Sjoerd
AU - Narygina, Olga
AU - Lette, Walter
AU - Schipper, Dirk J.
AU - ten Elshof, Johan E.
PY - 2017/7/21
Y1 - 2017/7/21
N2 - Solid inorganic lubricants are thermally stable but they are often limited by their lack of deformability, while organic lubricants have limitations in terms of thermal stability. In this study, a novel solid organic–inorganic nanocomposite lubricant that synergistically combines the thermochemically stable structure of a layered oxide with the relative softness of an organic polymer is presented. The nanocomposite is made by intercalating 11-aminoundecanoic acid in a lepidocrocite-type protonated titanate, H1.07Ti1.73O4. The amino acid molecules rapidly arrange to form a paraffinic bilayer in the gallery region of the layered host. This topotactic reaction yields a well-organized layered nanocomposite consisting of inorganic 2D titanate layers separated by amino acid molecules. Above elevated temperatures, 11-undecanoic acid polymerizes into nylon-11 confined between crystalline titanate monolayers. The lubricating properties of these nanocomposites up to 580 °C are determined using high-temperature pin-on-disc experiments using steel-steel contacts. The lubricative properties are based on the softening of the intercalated polymer above 200 °C. The encapsulation of the polymer chains by the inorganic titanate monolayers protects the organic component from thermal degradation and increases the thermal stability of the system.
AB - Solid inorganic lubricants are thermally stable but they are often limited by their lack of deformability, while organic lubricants have limitations in terms of thermal stability. In this study, a novel solid organic–inorganic nanocomposite lubricant that synergistically combines the thermochemically stable structure of a layered oxide with the relative softness of an organic polymer is presented. The nanocomposite is made by intercalating 11-aminoundecanoic acid in a lepidocrocite-type protonated titanate, H1.07Ti1.73O4. The amino acid molecules rapidly arrange to form a paraffinic bilayer in the gallery region of the layered host. This topotactic reaction yields a well-organized layered nanocomposite consisting of inorganic 2D titanate layers separated by amino acid molecules. Above elevated temperatures, 11-undecanoic acid polymerizes into nylon-11 confined between crystalline titanate monolayers. The lubricating properties of these nanocomposites up to 580 °C are determined using high-temperature pin-on-disc experiments using steel-steel contacts. The lubricative properties are based on the softening of the intercalated polymer above 200 °C. The encapsulation of the polymer chains by the inorganic titanate monolayers protects the organic component from thermal degradation and increases the thermal stability of the system.
KW - 22/4 OA procedure
U2 - 10.1002/admi.201700047
DO - 10.1002/admi.201700047
M3 - Article
VL - 4
JO - Advanced materials interfaces
JF - Advanced materials interfaces
SN - 2196-7350
IS - 14
M1 - 1700047
ER -