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

Wenhui Cao; Peng Ding; Qi Ding; Chaobin Liu; Wei Yu; Litian Hu;
University of Chinese Academy of Sciences; University of Chinese Academy of Sciences; Lanzhou Institute of Chemical Physics; Northwestern Polytechnical University; Lanzhou University; Lanzhou Institute of Chemical Physics
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Publisher: ACS
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Abstract AITranslate

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 Si3N4 friction pairs via the in situ formation of a colloidal lubrication film which could cooperate with the silica gel layer generated on the Si3N4 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.

KeyWords AITranslate

mechanical response sol−gel rheology friction wear
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Basic Information:

DOI：https://doi.org/10.1021/acsapm.2c02021

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Citation Information:

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 Si3N4 friction pairs via the in situ formation of a colloidal lubrication film which could cooperate with the silica gel layer generated on the Si3N4 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.

quote

GB/T 7714-2015 [1] Wenhui Cao, Peng Ding, Qi Ding, et al. ACS Applied Polymer Materials, 2023(5). DOI:10.1021/acsapm.2c02021.
MLA [1] Wenhui Cao, et al., ACS Applied Polymer Materials, no. 5, 2023, https://doi.org/10.1021/acsapm.2c02021.
APA [1] Wenhui Cao, Peng Ding, Qi Ding, Chaobin Liu, Wei Yu, & Litian Hu. (2023). ACS Applied Polymer Materials(5). https://doi.org/10.1021/acsapm.2c02021
IEEE [1] Wenhui Cao, Peng Ding, Qi Ding, Chaobin Liu, Wei Yu, and Litian Hu, ACS Applied Polymer Materials, no. 5, 2023, doi: 10.1021/acsapm.2c02021. keywords: {mechanical response;sol−gel;rheology;friction;wear}