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The Structure and Properties of a Novel Hydroxyl‐Terminated Hyperbranched Polymer for Inhibiting Shale Hydration
Author(s) -
Wang Hao,
Pu Xiaolin
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201902524
Subject(s) - thermogravimetric analysis , bentonite , adsorption , gel permeation chromatography , chemistry , zeta potential , fourier transform infrared spectroscopy , nuclear chemistry , polymer , scanning electron microscope , polymer chemistry , infrared spectroscopy , materials science , chemical engineering , organic chemistry , nanoparticle , engineering , composite material , nanotechnology
To inhibit the hydration and dispersion of shale, a hydroxyl‐terminated hyperbranched polymer (β‐CD‐HBP‐OH) was synthesized by the green raw materials: β–cyclodextrin and glycerol carbonate. The chemical structure of β‐CD‐HBP‐OH was characterized by the Fourier transform infrared spectroscopy (FT‐IR), nuclear magnetic resonance spectroscopy ( 1 H‐NMR and 13 C‐NMR) and gel permeation chromatography (GPC). As an inhibitor, β‐CD‐HBP‐OH possessed smaller hydrodynamic radius with less chain entanglement, demonstrating favourable rheology properties. The dominated hyperbranched structure and terminal hydroxyl groups of β‐CD‐HBP‐OH improved the inhibition by uniform adsorption and bridging. The recovery rates of shale cuttings were higher than 50% when β‐CD‐HBP‐OH exceed 1 wt %. The Zeta potential absolute values of the base slurry were reduced from 40.9 mV to 13.4 mV by β‐CD‐HBP‐OH's adsorption. The particle size of the base slurry was also increased from 2.017 μm to 4.026 μm by bridging effect. The results of thermogravimetric analysis (TGA) suggested β‐CD‐HBP‐OH decreased the water content of bentonite from 8.04% to 0.59%. Upon scanning electron microscope (SEM) images, more assemble bentonite aggregates were observable after β‐CD‐HBP‐OH treatment. Finally, the interaction between bentonite and β‐CD‐HBP‐OH was further confirmed by the FT‐IR spectrum and the X‐ray diffraction (XRD) spectrum.