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Properties and mechanism of a poly(ionic liquid) inhibitor contained bi‐functional groups for bentonite hydration
Author(s) -
Wang Hao,
Gao Yihang,
Jia Xuhong,
Liu Quanyi
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.51253
Subject(s) - bentonite , hydrogen bond , chemistry , adsorption , cationic polymerization , chemical engineering , polymer chemistry , materials science , organic chemistry , molecule , engineering
Present polymer inhibitors depend on a major inhibitory group to restrain bentonite hydration, and monomer design is concerned to improve the inhibition and stability through complex copolymerization. Conveniently, a homopolymer (PIL‐NH 2 ) that contained primary amine and cationic imidazolium as bi‐functional groups was proposed, aiming to provide two synergistic inhibitory modes. Comprehensive methods were conducted to characterize the chemical structure and inhibitory performance of PIL‐NH 2 . The ζ potential absolute value of bentonite suspension was decreased by PIL‐NH 2 from 28.7–33.3 mV to 4–7 mV, and the increment of bentonite particle size d 50 was observable from 1.83892 μm to over 200 μm. With water squeezed out, the lattice spacing d 001 of hydrated bentonite was reduced from 1.9070 to 1.2683 nm due to PIL‐NH 2 intercalation. The ESEM images revealed that inhibited bentonite showed a tight structure with classical dehydration phenomenon, and the hydrogen bond between PIL‐NH 2 and bentonite was further confirmed according to the FT‐IR result. In mechanism analysis, the electrostatic attraction and hydrogen bond existed simultaneously for PIL‐NH 2 to adsorb bentonite. The two adsorption modes from bi‐functional groups were synergistic to improve inhibition remarkably. PIL‐NH 2 maintained high performance during the whole hydration process, including crystalline hydration, osmotic hydration, and hydrated dispersion.