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journal article·2020-06-16Open access

Cationic Polymer Brush/Giant Polysaccharide Sacran Assembly: Structure and Lubricity

Kosuke Igata, Tatsunori Sakamaki, Yoshihiro Inutsuka, Yuji Higaki, Maiko K. Okajima, Norifumi L. Yamada, Tatsuo Kaneko, Atsushi Takahara

Langmuir· Volume 36· Issue 23
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Source abstract

Abstract

A highly effective aqueous lubrication strategy employing electrostatic assembly of a negatively charged ultrahigh molecular weight natural polysaccharide named "sacran" and a positively charged poly[2-(methacryloyloxy)ethyltrimethylammonium chloride] (PMTAC) brush was investigated. The PMTAC brush was compressed through the adsorption of sacran to produce the layered structure of a PMTAC brush/sacran hybrid bottom layer and a poorly hydrated sacran top layer. The dynamic friction coefficients of the PMTAC brush were drastically reduced in salt-free sacran aqueous solutions, and the lubrication mode transition from the brush-lubrication regime to hydrodynamic lubrication was promoted. The electrostatic assembly was inhibited by the addition of NaCl into the lubricant solutions, leading to the loss of the lubrication effect. The hydrodynamic lubrication would be encouraged by the local viscosity enhancement at the friction boundary due to the poorly hydrated and highly viscous PMTAC brush/sacran hybrid film produced by the spontaneous electrostatic assembly.
Source: openalex_inverted_index · Quality: baseline

Research context

Polymers

OpenAlex topics: Polymer Surface Interaction Studies · Pickering emulsions and particle stabilization · Biocrusts and Microbial Ecology

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan

Department of Integrated Science and Technology, Faculty of Science and Technology, Oita University, 700 Dannoharu, Oita 870-1192, Japan

Japan Advanced Institute of Science and Technology (JAIST), 1-1 Asahidai, Nomi-shi, Ishikawa 923-1292, Japan

Neutron Science Laboratory, High Energy Accelerator Research Organization, Ibaraki 319-1106, Japan

Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan

International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan

Funding

Ministry of Education, Culture, Sports, Science and Technology · Japan Society for the Promotion of Science · Cabinet Office, Government of Japan · Iketani Science and Technology Foundation

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