Thermally Induced Gelation of Poly(acrylamide) Grafted with Poly(<i>N</i>-isopropylacrylamide):  A Small-Angle Neutron Scattering Study

Barbier, Valessa; Hervé, Mélanie; Sudor, Ján; Brûlet, Annie; Hourdet, Dominique; Viovy, Jean‐Louis

doi:10.1021/ma049182y

Cited by 34 publications

(32 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With both small‐angle neutron scattering (SANS) and 1 H NMR techniques, Hourdet and coworkers, investigated the microstructures formed by the PNIPAM side chains. They found PNIPAM formed hydrophobic cores with diameters in the range of 7–10 nm, and the self‐association of PINPAM side chains resulted in solid‐state hydrophobic microdomains at high temperatures.…”

Section: N‐alkyl Substituted Acrylamide Copolymersmentioning

confidence: 99%

Thermoviscosifying Smart Polymers for Oil and Gas Production: State of the Art

Feng

2018

ChemPhysChem

View full text Add to dashboard Cite

Water-soluble polymers have been extensively used in all sections of the oil and gas upstream industry, but their inherent thermothinning behaviour has limited their applications in harsh environments. To address this issue, thermoviscosifying (or "thermothickening") polymers (TVPs) whose aqueous solution viscosity automatically increases upon increasing the temperature were introduced in the early 1990s. This review first recalls the background for developing such smart materials, followed by demonstrating the mechanism of thermothickening. Next, three major TVPs including N-alkyl substituted acrylamide copolymers, grafted polyethers, and cellulose derivatives are summarized with respect to their structure-property relationship, then their practical trials or potential uses in oil and gas drilling fluids, cementing slurries, hydraulic fracturing, steam flooding, and enhanced oil recovery are discussed. Finally, the advantages and disadvantages of the current TVPs are commented and future prospects are discussed to close this review.

show abstract

Section: N‐alkyl Substituted Acrylamide Copolymersmentioning

confidence: 99%

Thermoviscosifying Smart Polymers for Oil and Gas Production: State of the Art

Feng

2018

ChemPhysChem

View full text Add to dashboard Cite

show abstract

“…[13][14][15][16] This makes such systems interesting candidates for drug delivery systems. Often, gelation is observed if the temperature is raised above the LCST.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Predictions of Temperature-Induced Gelation in Aqueous Dispersions Containing PEO-Grafted Particles

2016

View full text Add to dashboard Cite

In this work we utilize classical polymer density functional theory (DFT) to study gelation in systems containing colloidal particles onto which polymers are grafted. The solution conditions are such that the corresponding bulk system displays a lower critical solution temperature (LCST). We specifically compare our predictions with experimental results by Shay et al., who investigated temperature response in aqueous dispersions containing polystyrene particles (PS), with grafted 45-mer poly(ethylene oxide) (PEO) chains. Our DFT treatment is based on a model for aqueous PEO solutions that was originally developed by Karlström for bulk solutions. In this model, monomers are assumed to be in either of two classes of states, labelled A and B, where B is more solvophobic than A. On the other hand, the degeneracy of B exceeds that of A, causing the population of solvophobic monomers to increase with temperature. In agreement with experimental findings by Shay et al., we locate gelation at temperatures considerably below T Θ , and far below the LCST for such chain lengths. This gelation occurs * To whom correspondence should be addressed 1 also without any dispersion interactions between the PS particles. Interestingly, the polymerinduced interaction free energy displays a non-monotonic dependence on the grafting density.At high grafting densities, bridging attractions between grafted layers take place (considerably below T Θ ). At low grafting densities, on the other hand, the polymers are able to bridge across to the other particle surface. Shay et al. conducted their experiments at very low ionic strength, using de-ionized water as a solvent. We demonstrate that even minute amounts of adsorbed charge on the surface of the particles, can lead to dramatic changes of the gelation temperature, especially at high grafting densities. Another interesting prediction is the existence of elongated (chain-like) equilibrium structures, at low particle concentrations. We emphasize that our model does not rely upon any temperature-dependent interactions.

show abstract

“…Thermo‐responsive polymers have drawn increasing attention in academic and industrial research. Investigation has been focused mostly in the biological and medical fields, such as drug delivery 1–7, tissue engineering 8, biotechnological devices 9, 10, immobilization of enzymes 11 and DNA separation or sequencing 12–19. These thermally sensitive polymers exhibit a “switchable viscosity” that is driven by volume‐phase transition responding to small variations in temperature.…”

Section: Introductionmentioning

confidence: 99%

Reduced matrix viscosity in DNA sequencing by CE and microchip electrophoresis using a novel thermo‐responsive copolymer

Wan

Zhang

et al. 2009

Electrophoresis

View full text Add to dashboard Cite

High viscosity is an inherent problem of sequencing matrices made of hydrophilic polymers. This problem is amplified in separations using microchips where the channels are even smaller. A novel thermal associating graft copolymer, using linear polyacrylamide (LPA) as the backbone and poly(propylene oxide) (PPO) as the graft side chain was synthesized. The injection problem could be resolved by introducing PPO side chains that can be assembled by using temperature changes but without an obvious detrimental effect on the sieving ability of the LPA. Viscosity measurement showed that these LPA-g-PPO copolymers had a transition temperature of ~ 40 °C, above which a significant increase in viscosity was observed. The sequencing performance depended on the thermal association properties of PPO and related parameters. Without optimization, a read length of 1000 bases with a single base resolution of 0.3 was achieved within an hour on an ABI 310 analyzer, using 1.8 wt% LPA-g-PPO (1.8 MDa, PPO, 0.2%). This novel thermal reversible copolymer solution can be a promising candidate as a viable matrix for DNA sequencing in capillary electrophoresis, and even more so in microchip electrophoresis.

show abstract

Thermally Induced Gelation of Poly(acrylamide) Grafted with Poly(N-isopropylacrylamide): A Small-Angle Neutron Scattering Study

Cited by 34 publications

References 38 publications

Thermoviscosifying Smart Polymers for Oil and Gas Production: State of the Art

Thermoviscosifying Smart Polymers for Oil and Gas Production: State of the Art

Theoretical Predictions of Temperature-Induced Gelation in Aqueous Dispersions Containing PEO-Grafted Particles

Reduced matrix viscosity in DNA sequencing by CE and microchip electrophoresis using a novel thermo‐responsive copolymer

Contact Info

Product

Resources

About