Concentration effect of N-isopropylacrylamide on viscoelastic properties of hydrosoluble thermo-thickening copolymers

Díaz-Silvestre, Sergio; Thomas, Claude St; Rivera-Vallejo, Claudia; Cadenas‐Pliego, Gregorio; Pérez-Álvarez, Marissa; León, Ramón Díaz de; Jiménez‐Regalado, Enrique J.

doi:10.1007/s00289-017-1943-0

Cited by 4 publications

(3 citation statements)

References 39 publications

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“…Although varieties of PNIPAM copolymers with different architecture have been synthesized, relatively few reports focus on their thermo-thickening properties. To the best of our knowledge, only block and graft PNIPAM copolymers have been studied so far [ 15 , 16 , 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Thermo-Responsive Starch-g-(PAM-co-PNIPAM): Controlled Synthesis and Effect of Molecular Components on Solution Rheology

2018

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A series of highly branched random copolymers of acrylamide (AM) and N-isopropylacrylamide (NIPAM) have been prepared from a waxy potato starch-based macroinitiator by aqueous Cu 0 -mediated living radical polymerization (Cu 0 -mediated LRP). The NIPAM intake in the copolymer was varied between 0% and 50 mol % to evaluate the influence of chain composition on the aqueous rheological properties as well as their low critical solution temperature (LCST). The viscosity of the copolymer was found to increase with the NIPAM intake and an LCST can be observed when the NIPAM content is high enough (e.g., 50 mol %). In addition, thermo-thickening behavior was observed at a low shear rate (γ ≤ 10 s −1 ) and higher NIPAM content was found to shift the onset of thermo-thickening behavior to a lower temperature. However, the absolute increase in viscosity values is reduced with the NIPAM intake. Besides this, an interesting significant thermo-thickening behavior was also observed on highly branched starch-g-polyacrylamide at high temperatures (>80 • C), which has not been previously reported. Rheology tests also revealed a good salt-resistant property in copolymers with low NIPAM content (e.g., <25 mol %). Considering the viscosity profile in saline as compared to that in pure water, this NIPAM intake seems to represent an optimum balance of viscosity and salt-resistance performance.

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Section: Introductionmentioning

confidence: 99%

Thermo-Responsive Starch-g-(PAM-co-PNIPAM): Controlled Synthesis and Effect of Molecular Components on Solution Rheology

2018

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“…On the other hand, polymer molecular chains curled into the phase separation state above the LCST, resulting in turbidity of the sample. Therefore, it was feasible to analyze the LCST of the sample by testing the transmittance of the sample aqueous solution. − Due to the above-mentioned special properties, NIPAM has been widely used in cell culture support materials, , temperature-responsive thickeners, , coatings, , biomedical materials, − etc. NIPAM has been reported to improve wellbore stability in water-based drilling fluids …”

Section: Introductionmentioning

confidence: 99%

Temperature-Responsive Nano-SiO₂ Composite for Improving Shale Stability in Oil-Based Drilling Fluids

Fan,

Shi,

Tang

et al. 2024

Energy Fuels

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The development of nanomicrometer pores and microfractures in shale gas formation leads to frequent wellbore instability during shale gas drilling, which seriously restricts the safe and rapid drilling of shale gas. In this work, N-isopropylacrylamide (NIPAM), N-hydroxyethyl acrylamide (HEAA), styrene (St), and nano-SiO 2 were used as raw materials to prepare the temperature-responsive nanocomposite named NHS/SiO 2 . NHS/SiO 2 was highly sensitive and exhibited reversible temperature sensitivity, with a lower critical solution temperature (LCST) of 82 °C. The amphiphilicity of NHS/ SiO 2 positively affected the stability of oil-based drilling fluids (OBDFs). The effects of NHS/SiO 2 on the plugging property of shale were tested by experiments on fluid loss, pressure transfer rate, shale specific surface area, shale pore volume, and shale strength. NHS/SiO 2 significantly plugged shale pores at 130 °C, with a specific surface area reduction rate of shale from 22.19% to 65.95% and pore volume reduction rate of shale from 30.73% to 68.51%. NHS/SiO 2 exhibited obvious oil adsorption in white oil and the water-in-oil emulsions after reaching the LCST. The maximum oil adsorption rate of NHS/SiO 2 in the water-in-oil emulsion was about 23.41 g/g. Finally, the mechanism of NHS/SiO 2 to improve the shale stability in OBDFs was further proposed. At high temperatures, NHS/SiO 2 increased its elastic deformation ability by adsorbing oil for a long time, thus improving the plugging efficiency.

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“…For example, various additives are added to drilling fluids for maintaining the viscosity level at high temperature . PNIPAAm is the most frequently used thermosensitive moiety as grafting chains in thermothickening polymer systems, with the viscosity increasing by 3 orders of magnitude or more as the temperature is increased from 40 to 60 °C. − There has been some investigation of thermothickening in mixtures of two homopolymers, but a rich parameter space remains to be explored in these types of systems.…”

Section: Introductionmentioning

confidence: 99%

Thermothickening Behavior of Self-Stabilized Colloids Formed from Associating Polymers

Chen

Shull

2019

Macromolecules

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The complexation of partially ethyl-quaternized poly(4-vinyl pyridine) (QVP) and poly(methacrylic acid) (PMAA) induces a dramatic change in solution viscoelasticity. In this work, we investigated a model system consisting of QVP (with 2% charge), PMAA, and dimethyl sulfoxide (DMSO)−water mixed solvent (85 wt % DMSO− 15 wt % water), which exhibits a remarkable thermothickening behavior, characterized by an increase of viscosity by 3 orders of magnitude when the temperature is increased by 20 °C. At low temperatures, this system behaves as a lowviscosity milky colloidal suspension that remains stable for periods of at least 1 year. At higher temperatures, the colloids swell, increasing their effective volume fraction and giving rise to the observed viscosity increase. The thermothickening/ thermothinning transition temperature could be tuned by varying the stoichiometry of the mixed polymers. We utilized rheometry, UV−vis spectroscopy, and dynamic light scattering to shed light on the mechanism of this phenomenon. This simple approach for achieving tunable thermothickening capability provides a new platform for designing thermoresponsive solutions from simple polymer mixtures.

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Concentration effect of N-isopropylacrylamide on viscoelastic properties of hydrosoluble thermo-thickening copolymers

Cited by 4 publications

References 39 publications

Thermo-Responsive Starch-g-(PAM-co-PNIPAM): Controlled Synthesis and Effect of Molecular Components on Solution Rheology

Thermo-Responsive Starch-g-(PAM-co-PNIPAM): Controlled Synthesis and Effect of Molecular Components on Solution Rheology

Temperature-Responsive Nano-SiO₂ Composite for Improving Shale Stability in Oil-Based Drilling Fluids

Thermothickening Behavior of Self-Stabilized Colloids Formed from Associating Polymers

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Concentration effect of N-isopropylacrylamide on viscoelastic properties of hydrosoluble thermo-thickening copolymers

Cited by 4 publications

References 39 publications

Thermo-Responsive Starch-g-(PAM-co-PNIPAM): Controlled Synthesis and Effect of Molecular Components on Solution Rheology

Thermo-Responsive Starch-g-(PAM-co-PNIPAM): Controlled Synthesis and Effect of Molecular Components on Solution Rheology

Temperature-Responsive Nano-SiO2 Composite for Improving Shale Stability in Oil-Based Drilling Fluids

Thermothickening Behavior of Self-Stabilized Colloids Formed from Associating Polymers

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Temperature-Responsive Nano-SiO₂ Composite for Improving Shale Stability in Oil-Based Drilling Fluids