Temperature sensitive poly(N-t-butylacrylamide-co-acrylamide) hydrogels: synthesis and swelling behavior

Ozturk, Vildan; Okay, Oğuz

doi:10.1016/s0032-3861(02)00357-9

Cited by 74 publications

(41 citation statements)

References 22 publications

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“…[50] Incorporating this sensitive dependence, the thermodynamic model predicts volume transition of the hydrogels in satisfactory agreement to the experimental data.…”

Section: Polymer-solvent Interaction Parameter Wmentioning

confidence: 58%

Modeling Investigation of Hydrogel Volume Transition

Chen

et al. 2004

Macro Theory & Simulations

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Summary: This paper provides an overview of the latest development in modeling and simulation of volume transition behaviors of hydrogels with models at both macroscopic and molecular levels. Energy conservation law, mass conservation law and momentum conservation law provide good starting points for developing models for hydrogel volume transition. Thermodynamic models, transport models, multiphasic mixture theory and molecular simulation are discussed. Thermodynamic models provide qualitative description of equilibrium volume transition of hydrogels. Both transport models and multiphasic mixture theory can predict transient and equilibrium volume transition of hydrogels. Molecular simulation provides mechanistic understanding of hydrogel volume transition. Several key parameters are summarized for future model development.

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“…[50] Incorporating this sensitive dependence, the thermodynamic model predicts volume transition of the hydrogels in satisfactory agreement to the experimental data.…”

Section: Polymer-solvent Interaction Parameter Wmentioning

confidence: 58%

Modeling Investigation of Hydrogel Volume Transition

Chen

et al. 2004

Macro Theory & Simulations

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“…In the FTIR spectra of the hydrogels, the typical absorption bands for NIPAAm, AAm and XA units can be seen about 3600-3100 cm 21 as broad bands for secondary NH amide, between 2980 and 2878 cm 21 for CH stretching frequencies for isopropyl groups, and at 1670 cm 21 a strong C@O amide I band, and at 1550 cm 21 for other strong amide II bands. The peak around 1400-1300 cm 21 belong to ACH(CH 3 ) 2 group in isopropyl groups, and the peaks about 1268-1000 cm 21 can be attributed to CAN bands in amide groups [5][6][7][8]. From this spectral analysis, it can be concluded that a polymeric network is formed, because of the functional groups of the each component of the hydrogel units: NIPAAm, AAm, and XA monomers with Bis.…”

Section: Synthesis Of Hydrogelsmentioning

confidence: 91%

Environmentally sensitive hydrogels: N‐isopropyl acrylamide/Acrylamide/ Mono‐, Di‐, Tricarboxylic acid crosslinked polymers

Işıkver

Saraydın

2014

Polymer Engineering & Sci

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Environmentally sensitive hydrogels responsive to various stimuli such as temperature, pH, ionic strength of the medium and the solvent were prepared by using N‐isopropyl acrylamide (NIPAM), acrylamide (AAm) and monomers that have various number of carboxylic acid (XA) functionality using N,N′‐methylene bisacrylamide (Bis) as crosslinker. Hydrogels were prepared via free radical polymerization reaction in aqueous solution. P(NIPAAm‐co‐AAm) and p(NIPAAm‐co‐AAm)/XA hydrogels that contain monoprotic crotonic acid (CA) exhibit a lover critical solution temperature (LCST) at 28°C, whereas p(NIPAAm‐co‐AAm)/IA (IA:itaconic acid), and P(NIPAAm‐co‐AAm)/ACA (ACA:acotonic acid) hydrogels exhibit a lover critical solution temperature at 30.7°C and 34.4°C, respectively. Spectroscopic and thermal analyses were performed for the structural and thermal characterizations of the prepared hydrogel. The swelling experiments as equilibrium swelling percentages by gravimetrically were carried out in different solvents, at different solutions temperature, pH, and ionic strengths to determine their effects on swelling characteristic of hydrogels. POLYM. ENG. SCI., 55:843–851, 2015. © 2014 Society of Plastics Engineers

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“…On the other hand, the ⌬H and ⌬S values reported for PNIPA-water and poly(N-t-butylacrylamide-co-acrylamide) [P(TBA-coAAm)] systems are negative. 18 In this case, polymersolvent systems possessing the LCST are characterized by negative values of both ⌬H and ⌬S. However, the results indicate that all the P(DMAPMA-co-LA) hydrogels studied here have UCSTs because of the positive ⌬H and ⌬S values.…”

Section: Figurementioning

confidence: 62%

“…18 The dashed lines in Figure 8 are the linear regression lines obtained from the high temperature range of the data points.…”

Section: Figurementioning

confidence: 99%

Synthesis and network parameters of hydrophobic poly(N‐[3‐(dimethylaminopropyl)]methacrylamide‐co‐lauryl acrylate) hydrogels

Çaykara

Birlik

2006

J of Applied Polymer Sci

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ABSTRACT:Hydrophobic poly(N-[3-(dimethylaminopropyl)]methacrylamide-co-lauryl acrylate) [P(DMAPMA-co-LA)] hydrogels with different LA content were synthesized by free-radical crosslinking copolymerization of corresponding monomers in water by using N, N-methylenebis(acrylamide) as the crosslinker, ammonium persulfate as the initiator, and N,N,NЈ,NЈ-tetramethylethylenediamine as the activator. The swelling equilibrium of the hydrogels was investigated as a function of temperature and hydrophobic comonomer content in pure water. An interesting feature of the swelling behavior of the P(DMAPMA-co-LA) hydrogels with low LA content was the reshrinking phase transition where the hydrogels swell once and collapse as temperature was varied in the range of 30 -40°C. The average molecular mass between crosslinks (M c ) and polymer-solvent interaction parameter () of the hydrogels were calculated from equilibrium swelling values. The enthalpy (⌬H) and entropy (⌬S) changes appearing in the parameter for the hydrogels were determined by using the Flory-Rehner theory based on the phantom network model of swelling equilibrium. The positive values for ⌬H and ⌬S indicated that the hydrogels had a positive temperature-sensitive property in water, that is, swelling at a higher temperature and shrinking at a lower temperature.

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Temperature sensitive poly(N-t-butylacrylamide-co-acrylamide) hydrogels: synthesis and swelling behavior

Cited by 74 publications

References 22 publications

Modeling Investigation of Hydrogel Volume Transition

Modeling Investigation of Hydrogel Volume Transition

Environmentally sensitive hydrogels: N‐isopropyl acrylamide/Acrylamide/ Mono‐, Di‐, Tricarboxylic acid crosslinked polymers

Synthesis and network parameters of hydrophobic poly(N‐[3‐(dimethylaminopropyl)]methacrylamide‐co‐lauryl acrylate) hydrogels

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