journal article·2023-05-12

Shear Responsive Gelation of Aqueous Polyacrylic Acid-co-polyacrylamide: Molecular Mechanism and Tribological Applications

Wenhui Cao, Peng Ding, Qi Ding, Chaobin Liu, Wei Yu, Litian Hu

ACS Applied Polymer Materials· Volume 5· Issue 5
Publisher page

Abstract

This study reports the shear-responsive gelation of an aqueous solution of polyacrylic acid- co -polyacrylamide (PAA- co -PAM). Microstructure characterization and molecular dynamics simulation reveal that the shear action results in the ordering of the polymer chains, thus increasing the strength of hydrogen bonds between chains and forming gel. Friction tests reveal that the PAA- co -PAM aqueous solution effectively reduces the friction and wear of Si 3 N 4 friction pairs via the in situ formation of a colloidal lubrication film which could cooperate with the silica gel layer generated on the Si 3 N 4 surface. Owing to the shear gelation characteristics of the PAA- co -PAM aqueous solution, the hydrogel lubrication film could be continuously formed under shear action, thus overcoming the insufficient lifetimes of existing hydrogel lubricants.
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Research context

OpenAlex topics: Force Microscopy Techniques and Applications · Polymer Surface Interaction Studies · Lubricants and Their Additives

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

Affiliations

State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, P. R. China

Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100039, P. R. China

State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi’an 710072, Shanxi, P. R. China

State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China

Funding

Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China · Basic Research Project

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