Effect of magnetic field on phase transitions in solutions and melts of flexible polymers

Вшивков, С. А.; Zhernov, Ilia; Nadol'skii, A. L.; Mizyov, A. S.

doi:10.1134/s0965545x17040149

Cited by 10 publications

(11 citation statements)

References 45 publications

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“…The decreasing T inf , with increasing field strength suggests that magnetic fields decrease the affinity for polymer–solvent interactions, making the transition more favorable at lower temperatures; in contrast, Vshivkov and co‐workers noted increases in phase transition temperatures in polyelectrolyte and polymer solutions. [ 33,34 ] With little change in the curve shape or width, magnetic fields do not appear to dramatically vary the PNIPAM aggregation pathway, but only the temperature at which the optical transition occurs (Figure 3A). Magnetic fields change the polarization of water molecules, [ 44 ] which has dramatic impacts on the thermodynamic properties of pure water [ 35–38,40,44 ] and the interactions with other species in aqueous environments.…”

Section: Resultsmentioning

confidence: 99%

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Effect of nanoparticle loading and magnetic field application on the thermodynamic, optical, and rheological behavior of thermoresponsive polymer solutions

Neal

Kresge

Quan

et al. 2022

Vinyl Additive Technology

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Although processing via external stimuli is a promising technique to tune the structure and properties of polymeric materials, the impact of magnetic fields on phase transitions in thermoresponsive polymer solutions is not well-understood. As nanoparticle (NP) addition is also known to impact these thermodynamic and optical properties, synergistic effects from combining magnetic fields with NP incorporation provide a novel route for tuning material properties. Here, the thermodynamic, optical, and rheological properties of aqueous poly(N-isopropyl acrylamide) (PNIPAM) solutions are examined in the presence of hydrophilic silica NPs and magnetic fields, individually and jointly, via Fourier-transform infrared spectroscopy (FTIR), magneto-turbidimetry, differential scanning calorimetry (DSC), and magneto-rheology. While NPs and magnetic fields both reduce the phase separation energy barrier and lower optical transition temperatures by altering hydrogen bonding (H-bonding), infrared spectra demonstrate that the mechanism by which these changes occur is distinct. Magnetic fields primarily alter solvent polarization while NPs provide PNIPAM-NP H-bonding sites. Combining NP addition with field application uniquely alters the solution environment and results in fielddependent rheological behavior that is unseen in polymer-only solutions. These investigations provide fundamental understanding on the interplay of magnetic fields and NP addition on PNIPAM thermoresponsivity which can be harnessed for increasingly complex stimuli-responsive materials.

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Section: Resultsmentioning

confidence: 99%

“…[ 34 ] Vshivkov et al also examined flexible polymer melts and solutions in magnetic fields, noting an increase in crystallization temperature of polyethylene, also attributed to chain orientation along magnetic field lines. [ 33 ]…”

Section: Introductionmentioning

confidence: 99%

Effect of nanoparticle loading and magnetic field application on the thermodynamic, optical, and rheological behavior of thermoresponsive polymer solutions

Neal

Kresge

Quan

et al. 2022

Vinyl Additive Technology

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“…This orientation is related to the anisotropy of the magnetic susceptibility of molecules, which in turn is associated with the anisotropy of their structure. The effect of a magnetic field on the properties of polymer systems is discussed in [19][20][21][22][23][24][25][26][27][28].…”

Section: Effect Of Magnetic Field On Liquid Crystalline Systemsmentioning

confidence: 99%

Phase Transitions and Structure of Liquid Crystalline Cellulose Ether Solutions in a Magnetic Field and in Its Absence

Вшивков¹,

Rusinova²

2022

Liquid Crystals

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The results of research studies of a magnetic field effect on structure and phase transitions of liquid crystalline polymer systems are described. Influence of intensity of the magnetic field, molecular weight, and concentration of polymers in solutions on the phase diagrams is analyzed. The dependences of boundary curves on the chemical structure of polymers and solvents are discussed. Results of theoretical researches of the magnetic field effect on the diamagnetic macromolecule orientation in solutions are described. The shift of boundary curves of liquid crystalline cellulose derivative systems is compared with the energy of magnetic field stored by solutions.

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“…However, researchers reported a larger ∆ T for another order–disorder transition [ 122 ]. Recently, researchers reported that the crystallization temperature of polyethylene and polyethylene glycol increases by several degrees in a magnetic field [ 123 ]. Likely, a high ∆ T strongly depends on the

of the system under investigation.…”

Section: Thermodynamics: Phase Transition Temperaturementioning

confidence: 99%

Magnetic Processing of Diamagnetic Materials

Yamato

Kimura

2020

Polymers

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Currently, materials scientists and nuclear magnetic resonance spectroscopists have easy access to high magnetic fields of approximately 10 T supplied by superconducting magnets. Neodymium magnets that generate magnetic fields of approximately 1 T are readily available for laboratory use and are widely used in daily life applications, such as mobile phones and electric vehicles. Such common access to magnetic fields—unexpected 30 years ago—has helped researchers discover new magnetic phenomena and use such phenomena to process diamagnetic materials. Although diamagnetism is well known, it is only during the last 30 years that researchers have applied magnetic processing to various classes of diamagnetic materials such as ceramics, biomaterials, and polymers. The magnetic effects that we report herein are largely attributable to the magnetic force, magnetic torque, and magnetic enthalpy that in turn, directly derive from the well-defined magnetic energy. An example of a more complex magnetic effect is orientation of crystalline polymers under an applied magnetic field; researchers do not yet fully understand the crystallization mechanism. Our review largely focuses on polymeric materials. Research topics such as magnetic effect on chiral recognition are interesting yet beyond our scope.

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Effect of magnetic field on phase transitions in solutions and melts of flexible polymers

Cited by 10 publications

References 45 publications

Effect of nanoparticle loading and magnetic field application on the thermodynamic, optical, and rheological behavior of thermoresponsive polymer solutions

Effect of nanoparticle loading and magnetic field application on the thermodynamic, optical, and rheological behavior of thermoresponsive polymer solutions

Phase Transitions and Structure of Liquid Crystalline Cellulose Ether Solutions in a Magnetic Field and in Its Absence

Magnetic Processing of Diamagnetic Materials

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