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Article

Polymer-Decorated Cellulose Nanocrystals as Environmentally Friendly Additives for Olefin-Based Drilling Fluids

1
Laboratório de Pesquisa em Petróleo, Universidade Federal do Rio Grande do Norte, Natal, RN 59078-970, Brazil
2
Departamento de Física, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria, RS 97105-900, Brazil
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2021, 22(1), 352; https://doi.org/10.3390/ijms22010352
Received: 26 November 2020 / Revised: 24 December 2020 / Accepted: 25 December 2020 / Published: 31 December 2020
In this study, we intended to evaluate the performance of olefin-based drilling fluids after addition of cellulose nanocrystal (CNC) derivatives. For this purpose, firstly, cellulose nanocrystals, produced from sulfuric acid hydrolysis of cotton fibers, were functionalized with poly(N-isopropylacrylamide) (PNIPAM) chains via free radicals. The samples were then characterized via Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), confocal microscopy, dynamic light scattering (DLS), and zeta potential measurements in water. The FTIR and NMR spectra exhibited the characteristic signals of CNC and PNIPAM groups, indicating successful grafting. As expected, X-ray diffractograms showed that the crystallinity of CNCs reduces after chemical modification. TGA revealed that the surface-functionalized CNCs present higher thermal stability than pure CNCs. The confocal microscopy, zeta potential, and DLS results were consistent with the behavior of cellulose nanocrystals decorated by a shell of PNIPAM chains. The fluids with a small amount of modified CNCs presented a much lower volume of filtrate after high-temperature and high-pressure (HTHP) filtration tests than the corresponding standard fluid, indicating the applicability of the environmentally friendly particles for olefin-based drilling fluids. View Full-Text
Keywords: CNC; PNIPAM; grafting from; water-in-oil emulsion fluid; filtrate reducer CNC; PNIPAM; grafting from; water-in-oil emulsion fluid; filtrate reducer
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MDPI and ACS Style

Pinheiro, J.A.; Marques, N.d.N.; Villetti, M.A.; Balaban, R.d.C. Polymer-Decorated Cellulose Nanocrystals as Environmentally Friendly Additives for Olefin-Based Drilling Fluids. Int. J. Mol. Sci. 2021, 22, 352. https://doi.org/10.3390/ijms22010352

AMA Style

Pinheiro JA, Marques NdN, Villetti MA, Balaban RdC. Polymer-Decorated Cellulose Nanocrystals as Environmentally Friendly Additives for Olefin-Based Drilling Fluids. International Journal of Molecular Sciences. 2021; 22(1):352. https://doi.org/10.3390/ijms22010352

Chicago/Turabian Style

Pinheiro, José A., Nívia d.N. Marques, Marcos A. Villetti, and Rosangela d.C. Balaban 2021. "Polymer-Decorated Cellulose Nanocrystals as Environmentally Friendly Additives for Olefin-Based Drilling Fluids" International Journal of Molecular Sciences 22, no. 1: 352. https://doi.org/10.3390/ijms22010352

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