Overview of the effect of monomers and green solvents on thermoresponsive copolymers: phase transition temperature and surface properties

Reddy, P. Madhusudhana; Chang, Chi‐Jung; Hsieh, Shih‐Rong; Huang, Hsin-Chun; Lee, Ming-Ching

doi:10.1039/c5ra18246h

Cited by 7 publications

(6 citation statements)

References 51 publications

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“…In other words, the most dramatic temperature-triggered changes occur within the basic structural units which prevail in the solution at lower concentrations. Differentiation in aggregate types also explains the shift of kink location to higher temperatures: clusters formation promotes additional noncovalent bonds in the assemblies that consequently results in a stronger bonding and higher temperature of phase transition (this effect is similar to those observed in thermoresponsive copolymers when increasing the length of monomer chain 116 ).…”

Section: Energy and Fuelsmentioning

confidence: 58%

Temperature-Triggered Rearrangement of Asphaltene Aggregates as Revealed by Pulsed-Field Gradient NMR

Morozov

Yushmanov²,

Martyanov

2019

Energy Fuels

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The tendency of asphaltenes for aggregation followed by precipitation and deposition plays a crucial role in the petroleum industry since these processes present severe problems during the production, recovery, and processing of crude oils and fossil hydrocarbon feedstocks. The dynamics of oil asphaltene aggregates dissolved in chloroform at different concentrations varied in a wide range that was investigated at temperatures from 0 to 55 °C using the Pulsed-Field Gradient NMR technique. The components attributed to nanoaggregates and macroaggregates were successfully resolved, which allowed us to measure their diffusion coefficients. The diffusion coefficients for all types of aggregates grow as the asphaltene concentration decreases, whereas the partial weight of the aggregates increases with the increase of asphaltene concentration. The difference in diffusion behavior of the aggregates of different types was registered when passing the critical concentration range 10–20 g/L. The nano- and macroaggregates behave independently when the asphaltene concentration is higher than 20 g/L (concentrated regime), while below 20 g/L (semidiluted regime) the components related to the different types of aggregates cannot be properly resolved. It was found that regardless of the asphaltene concentration, the diffusion coefficients for nano- and macroaggregates demonstrate similar temperature behavior giving the straight lines in the Arrhenius coordinates which change their slopes when passing the temperature range 20–30 °C. The phenomenon evidences the thermally induced cleavage of noncovalent bonds with subsequent rearrangement of asphaltene aggregates that is observed for all concentration regimes covering the existence of asphaltene aggregates of all types. The data obtained are well consistent with the modern concept of asphaltene aggregate structure and fairly agree with the data obtained earlier. We believe these results will contribute essentially to a better understanding of the fundamental behavior of asphaltenes and their aggregates, providing a deep insight into aggregate transformation triggered by the temperature.

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Section: Energy and Fuelsmentioning

confidence: 58%

Temperature-Triggered Rearrangement of Asphaltene Aggregates as Revealed by Pulsed-Field Gradient NMR

Morozov

Yushmanov²,

Martyanov

2019

Energy Fuels

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“…It is reported that the folded conformation of BSA in water is attributed to the formation of a water shell around the BSA [ 49 ]. In the present study, the equal distribution of monomers, PEGMA and AA, cause PGA-1 to be more hydrophilic [ 39 ], and thereby this polymer can easily alter the hydration shell around the BSA. Moreover, the optimum amount of PEGMA in PGA-1 can increase the bulkiness of the backbone of polymer, and thereby, restricts the flexibility of the entire copolymer system and results in more hydrophilicity by hindering the formation of the intramolecular hydrogen bonds [ 39 , 51 ].…”

Section: Resultsmentioning

confidence: 99%

“…In the present study, the equal distribution of monomers, PEGMA and AA, cause PGA-1 to be more hydrophilic [ 39 ], and thereby this polymer can easily alter the hydration shell around the BSA. Moreover, the optimum amount of PEGMA in PGA-1 can increase the bulkiness of the backbone of polymer, and thereby, restricts the flexibility of the entire copolymer system and results in more hydrophilicity by hindering the formation of the intramolecular hydrogen bonds [ 39 , 51 ]. Therefore, the behavior (flexible/stiff) of the polymer is the result of intermolecular hydrogen bonds.…”

Section: Resultsmentioning

confidence: 99%

“…The procedure for the synthesis of these copolymers can be found elsewhere [ 39 ]. P(NIPAM- co -PEGMA- co -AA) copolymers were prepared by following the procedure described here.…”

Section: Methodsmentioning

confidence: 99%

“…All the hydrogels were freeze-dried before use. The results for characterization and phase transition of these polymers can be found in our recent work [ 39 ]. In our previous work, these polymers were abbreviated as PGA-4 and PGA-7 based on the weight fractions of PEGMA and AA.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Exploring the Behavior of Bovine Serum Albumin in Response to Changes in the Chemical Composition of Responsive Polymers: Experimental and Simulation Studies

et al. 2016

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Knowledge of the interactions between polymer and protein is very important to fabricate the potential materials for many bio-related applications. In this regard, the present work investigated the effect of copolymers on the conformation and thermal stability of bovine serum albumin (BSA) with the aid of biophysical techniques such as fluorescence spectroscopy, circular dichroism (CD) spectroscopy and differential scanning calorimetry (DSC). In comparison with that of copolymer PGA-1.5, our fluorescence spectroscopy results reveal that the copolymer PGA-1, which has a lower PEGMA/AA ratio, shows greater influence on the conformation of BSA. Copolymers induced unfolding of the polypeptide chain of BSA, which was confirmed from the loss in the negative ellipticity of CD spectra. DSC results showed that the addition of PGA-1 and PGA-1.5 (0.05% (w/v) decreased the transition temperature by 14.8 and 11.5˝C, respectively). The results from the present study on the behavior of protein in response to changes in the chemical composition of synthetic polymers are significant for various biological applications such as enzyme immobilization, protein separations, sensor development and stimuli-responsive systems.

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Profiling the molecular interactions between a promising thermoresponsive polymer and ionic liquid: A biophysical outlook

Umapathi

Narang

Venkatesu

et al. 2019

Journal of Molecular Liquids

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Overview of the effect of monomers and green solvents on thermoresponsive copolymers: phase transition temperature and surface properties

Abstract: The thermoresponsive and surface properties of PNIPAM based copolymers were investigated in response to green solvents, ionic liquids.

Cited by 7 publications

References 51 publications

Temperature-Triggered Rearrangement of Asphaltene Aggregates as Revealed by Pulsed-Field Gradient NMR

Temperature-Triggered Rearrangement of Asphaltene Aggregates as Revealed by Pulsed-Field Gradient NMR

Exploring the Behavior of Bovine Serum Albumin in Response to Changes in the Chemical Composition of Responsive Polymers: Experimental and Simulation Studies

Profiling the molecular interactions between a promising thermoresponsive polymer and ionic liquid: A biophysical outlook

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