Temperature Effect on Hydrogen Bonds in Triblock Copolymers of Poly(Ethylene Oxide) and Polyacrylamide

Permyakova, N. M.; Zheltonozhskaya, Tatyana; Fedorchuk, Sergey; Zagdanskaya, N. E.; Syromyatnikov, V. G.

doi:10.1080/15421400701229453

Cited by 6 publications

(6 citation statements)

References 11 publications

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“…In turn, PAAm in water at room temperature (that is, above T c ) forms different hydrogen bond structures, − including free amide groups (Figure , structure c), cis-trans -multimers (Figure , structure d), and trans -multimers (Figure , structure e) of amide groups. However, the amount of cis-trans -associates as well as trans -associates of the amide groups in PAAm is significantly smaller than that of free amide groups.…”

Section: Results and Discussionmentioning

confidence: 99%

Temperature- and pH-Responsive Schizophrenic Copolymer Brush Coatings with Enhanced Temperature Response in Pure Water

Shymborska

Stetsyshyn

Awsiuk

et al. 2023

ACS Appl. Mater. Interfaces

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Novel brush coatings were fabricated with glass surface-grafted chains copolymerized using surface-initiated atom transfer radical polymerization (SI-ATRP) from 2-(2-methoxyethoxy)ethyl methacrylate (OEGMA188) and acrylamide (AAm), taken in different proportions. P(OEGMA188-co-AAm) brushes with AAm mole fraction >44% (determined with XPS and TOF-SIMS spectroscopy) and nearly constant with the depth copolymer composition (TOF-SIMS profiling) exhibit unusual temperature-induced transformations: The contact angle of water droplets on P(OEGMA188-co-AAm) coatings increases by ∼45° with temperature, compared to 17–18° for POEGMA188 and PAAm. The thickness of coatings immersed in water and the morphology of coatings imaged in air show a temperature response for POEGMA188 (using reflectance spectroscopy and AFM, respectively), but this response is weak for P(OEGMA188-co-AAm) and absent for PAAm. This suggests mechanisms more complex than a simple transition between hydrated loose coils and hydrophobic collapsed chains. For POEGMA188, the hydrogen bonds between the ether oxygens of poly(ethylene glycol) and water hydrogens are formed below the transition temperature T c and disrupted above T c when polymer–polymer interactions are favored. Different hydrogen bond structures of PAAm include free amide groups, cis-trans-multimers, and trans-multimers of amide groups. Here, hydrogen bonds between free amide groups and water dominate at T < T c but structures favored at T > T c, such as cis-trans-multimers and trans-multimers of amide groups, can still be hydrated. The enhanced temperature-dependent response of wettability for P(OEGMA188-co-AAm) with a high mole fraction of AAm suggests the formation at T c of more hydrophobic structures, realized by hydrogen bonding between the ether oxygens of OEGMA188 and the amide fragments of AAm, where water molecules are caged. Furthermore, P(OEGMA188-co-AAm) coatings immersed in pH buffer solutions exhibit a ‘schizophrenic’ behavior in wettability, with transitions that mimic LCST and UCST for pH = 3, LCST for pH = 5 and 7, and any transition blocked for pH = 9.

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Section: Results and Discussionmentioning

confidence: 99%

Temperature- and pH-Responsive Schizophrenic Copolymer Brush Coatings with Enhanced Temperature Response in Pure Water

Shymborska

Stetsyshyn

Awsiuk

et al. 2023

ACS Appl. Mater. Interfaces

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“…The strength of hydrogen bonds [48][49] would lead to a greater leak of water from the IPC matrix which would result in a decrease in the swelling degree at higher pH (10)(11)(12).…”

Section: Resultsmentioning

confidence: 99%

“…[1][2][3] Hydrogels may show a swelling behavior dependent on the external environment. [4][5][6] Some of the factors affecting the swelling of hydrogels include pH, [7][8][9] temperature, [10] monomer mole ratio and crosslinking density. [11][12][13] The chemical structure of the polymer may also affect the swelling ratio of the hydrogels.…”

Section: Introductionmentioning

confidence: 99%

Effect of pH , Temperature and Monomer Mole Ratios on the Swelling Properties of Polyethylene Oxide-Polymethacrylic Acid-Polyacrylamide ( PEO-PMAA-PAAM ) Interpolymer Complex ( IPC )

Banat

2015

JJC

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Swelling characteristics and physicochemical properties of the complexation process between a polycarboxylic acid (polymethacrylic acid, PMAA) and non-ionic polymers, polyethylene oxide (PEO) and polyacrylamide (PAAM), were studied. The presence of both strong and weak hydrogen bonding in the (PEO-PMAA-PAAM) interpolymer complexes (IPCs) have been correlated with their swelling behavior. Information about the molecular transport of liquid into the polymer matrix of (PEO-PMAA-PAAM) can be clarified by understanding the interpolymer complex equilibrium swelling behavior. The effect of contact time on the swelling extent of the (IPC) samples with aqueous solution, pH, temperature and the monomer mole ratios of MAA and AAM were investigated. The optimum swelling conditions were found to be at pH 7, 30ºC and 180 minutes of contact time. Increasing the monomer mole ratio of the non-ionic monomer (AAM) resulted in an improvement in the degree of swelling as a function of both time and temperature. The swelling behavior of the prepared (IPC) showed compatible swelling performance which can be used in bio-filtration process. Swelling/de-swelling cycles were used to examine the structure stability and the swelling performance of the (IPC). Due to its structural stability and high swelling performance, IPC with MAA: AAM (1:1) monomer mole ratio could be used for an extended number of swelling/de-swelling cycles.

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“…The effective length () of the trans-multimers of amide groups (structure 2) was also defined using known relation: =А1679/А1694 [23,24].…”

Section: Resultsmentioning

confidence: 99%

Compositions of Anticancer Drug with Micellar Nanocarriers and Their Cytotoxicity

et al. 2017

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Temperature Effect on Hydrogen Bonds in Triblock Copolymers of Poly(Ethylene Oxide) and Polyacrylamide

Cited by 6 publications

References 11 publications

Temperature- and pH-Responsive Schizophrenic Copolymer Brush Coatings with Enhanced Temperature Response in Pure Water

Temperature- and pH-Responsive Schizophrenic Copolymer Brush Coatings with Enhanced Temperature Response in Pure Water

Effect of pH , Temperature and Monomer Mole Ratios on the Swelling Properties of Polyethylene Oxide-Polymethacrylic Acid-Polyacrylamide ( PEO-PMAA-PAAM ) Interpolymer Complex ( IPC )

Compositions of Anticancer Drug with Micellar Nanocarriers and Their Cytotoxicity

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