Molecular thermodynamic analysis for phase transitions of linear and cross-linked poly(N-isopropylacrylamide) in water/2-propanol mixtures

Oh, Suk Yung; Kim, Hojin; Bae, Young Chan

doi:10.1016/j.polymer.2013.10.026

Cited by 20 publications

(14 citation statements)

References 82 publications

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“…This CAT is determined by the critical solution temperature of the graft monomer employed. N-isopropylacrylamide (NIPA) is a commonly employed monomer in preparing thermos-responsive polymers and it is characterized by a low critical solution temperature (LCST) (Oh et al, 2013;Zhang and Hoogenboom, 2015;Victor et al, 2016;Badi, 2017;Santis et al, 2017). The LCST represents the temperature value below which components of a mixture are miscible.…”

Section: Effect Of Temperaturementioning

confidence: 99%

Hydrophobically associating polymers for enhanced oil recovery – Part A: A review on the effects of some key reservoir conditions

Afolabi

Oluyemi

Officer

et al. 2019

Journal of Petroleum Science and Engineering

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Research advancement in polymer flooding for Enhanced Oil Recovery (EOR) has been growing over the last decade. This growth can be tied to increased funding towards the development of superior polymers such as hydrophobically associating polymers when oil prices were high and increasing concern that "easy oil" has been exploited with the focus now on "difficult to extract" oil. The use of hydrophobically associating polymers for EOR was discussed along with its limitations. In this context, the improved rheological properties of associating polymers cannot only be linked to the molecular structures arising from different synthesis methods. Equally, external parameters similar to conditions of oil reservoirs affect the rheological properties of these polymers. As such, this review placed critical emphasis on the molecular architecture of the polymer and the synthesis route and this was linked to the observed rheological properties. In addition, the influence of some key oilfield parameters such as temperature, salinity, pH, and reservoir heterogeneity on the rheological behaviour of hydrophobically associating polymers were reviewed. In this respect, the various findings garnered in understanding the correlation between polymer rheological properties and oilfield parameters were critically reviewed. For associating polymers, an understanding of the molecular architecture (and hence the synthesis method) is crucial for its successful design. However, this must be theoretically linked to the preferred EOR application requirements (based on oilfield parameters).

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Section: Effect Of Temperaturementioning

confidence: 99%

Hydrophobically associating polymers for enhanced oil recovery – Part A: A review on the effects of some key reservoir conditions

Afolabi

Oluyemi

Officer

et al. 2019

Journal of Petroleum Science and Engineering

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show abstract

“…Currently, DLS is used on a routine basis for the analysis of particle sizes in the sub micrometer range; it provides an estimation of the average size and its distribution within a measuring time of a few minutes. However, improvements in the ability to model dynamic behavior and relate it to scattering data has continued to make it a useful tool to study slow effects such as swelling mechanisms and phase transitions [117][118][119][120][121][122][123][124][125][126][127]. Still, XPCS is considered superior to DLS in certain situations because 1) it enables high-q dynamics and 2) it can probe samples that are opaque or subject to multiple light scattering phenomena under DLS conditions.…”

Section: Time-resolved Dynamics With Photon Correlation Spectroscopymentioning

confidence: 99%

Combining theory and experiment for X-ray absorption spectroscopy and resonant X-ray scattering characterization of polymers

Cordova

Brady

2016

Polymer

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An improved understanding of fundamental chemistry, electronic structure, morphology, and dynamics in polymers and soft materials requires advanced characterization techniques that are amenable to in situ and in operando studies. Soft X-ray methods are especially useful in their ability to non-destructively provide material or chemical moiety specific information. Analysis of these experiments, which can be very dependent on X-ray energy and polarization, can quickly become complex. Complementary modeling and predictive capabilities are required to properly probe these critical features. Here, we present relevant background on this emerging suite of techniques. We focus on how the combination of theory and experiment has been applied and can be further developed to drive our understanding of how these methods probe relevant chemistry, structure, and dynamics in soft materials.

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“…applied the perturbed‐chain statistical association fluid theory (PC‐SAFT) to describe the gel swelling phenomena. Recently, Bae and coworkers . reported a robust method for estimating the various swelling behaviors of polymer gel from polymer solution phase equilibrium and Lee and Bae considered the salt effect on swelling behavior.…”

Section: Introductionmentioning

confidence: 99%

Group contribution method for the swelling behavior of thermo‐responsive hydrogels

Yang

Bae

2017

J Polym Sci B Polym Phys

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A group contribution method is introduced to describe the swelling behavior of thermo‐sensitive hydrogel systems. The accuracy of group contribution calculations is strongly dependent on the choice of thermodynamic model. Therefore, we revise the modified double lattice (MDL) model and develop a new expression for the interaction energy parameter using the association theory of Sanchez to take into account complex polymer/solvent mixing. The net Helmholtz energy for a hydrogel is established by combining the revised MDL model and modified Flory–Rehner elastic model. Group parameters are generated by fitting to experimental swelling data from both homopolymer and copolymer gel systems. The effect of salt on the volume phase transition is modeled by introducing an additional salt‐specific parameter to investigate various stimuli‐response swelling behavior. Calculated swelling equilibria using the new group contribution method shows excellent agreement with experimental data and various stimuli‐response volume phase transitions. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017, 55, 455–463

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Molecular thermodynamic analysis for phase transitions of linear and cross-linked poly(N-isopropylacrylamide) in water/2-propanol mixtures

Cited by 20 publications

References 82 publications

Hydrophobically associating polymers for enhanced oil recovery – Part A: A review on the effects of some key reservoir conditions

Hydrophobically associating polymers for enhanced oil recovery – Part A: A review on the effects of some key reservoir conditions

Combining theory and experiment for X-ray absorption spectroscopy and resonant X-ray scattering characterization of polymers

Group contribution method for the swelling behavior of thermo‐responsive hydrogels

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