Chapter 8 Polyacrylamides

Wei, Yen; Coscia, Anthony T.; Kohen, Samuel I.

doi:10.1016/s0376-7361(08)70460-6

Cited by 7 publications

(3 citation statements)

References 53 publications

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“…The charge of PAM depends on pH. PAM is nonionic at intermediate pH values, as shown by the ζ-potential result below, but we observed that when PAM was grafted to CNCs, the ζ-potential increased compared to CNC …”

Section: Resultsmentioning

confidence: 58%

“…PAM is nonionic at intermediate pH values, as shown by the ζ-potential result below, but we observed that when PAM was grafted to CNCs, the ζ-potential increased compared to CNC. 55 The FT-IR spectra for the parent CNC, CNC-GMA, PSS, and PAM materials set the control measurements for the CNC-polymer hybrid materials (Figure S4). The CNC spectrum exhibits a range of signals.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Cellulose Nanocrystal–Polyelectrolyte Hybrids for Bentonite Water-Based Drilling Fluids

Balding

et al. 2020

ACS Appl. Bio Mater.

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Cellulose nanocrystals (CNCs), with their rodlike shape and nanoscale dimensions, greatly improve the filtration performance of bentonite-containing, water-based drilling fluids (BT-WDFs) through interactions with the BT platelets. When these WDFs are exposed to high salt concentrations, though, their fluid retention properties are greatly diminished due to reduced CNC-BT interaction and BT aggregation/flocculation. Consequently, we reduce BT–BT interaction at high salt by grafting polyelectrolytes (PE) to CNC particles (CNC-PE) to enhance CNC-BT interactions when incorporating these hybrid particles with BT-WDFs. The particles sterically and electrostatically screen BT platelets from associating, thus improving fluid filtration performance at high salt. Three types of CNC modifications were carried out: grafting from direct surface initiation, modification with vinyl-terminated glycidyl methacrylate (GMA) before grafting, and physical mixing of CNC with a polymer. These modifications were performed using three polyelectrolyte materials: anionic polystyrene sulfonate (PSS), cationic polyacrylamide (PAM), and a random copolymer of PSS and PAM (PSS-co-PAM). Formulations containing CNC-PEs prepared by covalent grafting exhibited superior filtration properties compared to those in which CNCs and PEs were physically mixed. The higher graft loading achieved with the GMA method resulted in poorer filtration results compared to the direct grafting method due to CNC-PE interparticle cross-linking. PSS-modified CNC-PEs appeared to attach to BT edges, while PAM-modified CNC-PEs attached to the BT faces. These interactions disrupted BT aggregation, with the PSS-co-PAM CNC hybrid displaying the most desired filtration properties. The results highlight the importance of steric and charge stabilization of the BT particle edges and faces to achieve high-performance WDFs for well excavation.

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Section: Resultsmentioning

confidence: 58%

Section: ■ Results and Discussionmentioning

confidence: 99%

Cellulose Nanocrystal–Polyelectrolyte Hybrids for Bentonite Water-Based Drilling Fluids

Balding

et al. 2020

ACS Appl. Bio Mater.

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“…Hydrolyzed polyacrylamide (HPAM) is one of the most studied polyacrylamide (PAM) derivatives due to its lateral anionic carboxylate groups, which strongly impact its solubility, stability, and structural conformation in solution [ 1 , 2 ]. Usually, this macromolecule is prepared by PAM hydrolysis, where the pH conditions can be modulated to produce a completely or a partially hydrolyzed structure [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Hydrolyzed Polyacrylamide as an In Situ Assistant in the Nucleation and Growth of Gold Nanoparticles

et al. 2022

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The modulation of nanoparticles’ size, shape, and dispersion by polymers has attracted particular attention in different fields. Nevertheless, there is a lack of information regarding the use of charged macromolecules as assistants in the nanostructures’ nucleation and growth processes. Prompted by this, the in situ synthesis of gold nanoparticles (AuNPs) aided by hydrolyzed polyacrylamides (HPAM), with different chemical structures, was developed. In contrast to the conventional synthesis of nanostructures assisted by polyacrylamide, here, the polymerization, hydrolysis, and nanostructure formation processes were carried out simultaneously in the same milieu. Likewise, the growing chains acted as a template for the nanoparticles’ growth, so their conformations and chemical structure, especially the amount of charges along the chain, played an important role in the AuNPs’ morphology, size, and some of the final composite features. The nanocomposite was thoroughly characterized with appropriate techniques, including ATR–FTIR, GPC, UV–Vis, and SEM.

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Synthesis, characterization and rheological properties of copolymer based on poly (para-isobutyl-N-Phenethyl acrylamide -Acrylamide) with drilling mud

Jabbar

2021

J Polym Res

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Chapter 8 Polyacrylamides

Cited by 7 publications

References 53 publications

Cellulose Nanocrystal–Polyelectrolyte Hybrids for Bentonite Water-Based Drilling Fluids

Cellulose Nanocrystal–Polyelectrolyte Hybrids for Bentonite Water-Based Drilling Fluids

Hydrolyzed Polyacrylamide as an In Situ Assistant in the Nucleation and Growth of Gold Nanoparticles

Synthesis, characterization and rheological properties of copolymer based on poly (para-isobutyl-N-Phenethyl acrylamide -Acrylamide) with drilling mud

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