Swelling of poly(N-isopropylacrylamide) gels in water-alcohol (C1-C4) mixed solvents

Mukae, Katsuya; Sakurai, Masaru; Sawamura, Seiji; Makino, Kimiko; Kim, Sung Wan; Ueda, Issaku; Shirahama, Keishiro

doi:10.1021/j100105a034

Cited by 168 publications

(179 citation statements)

References 2 publications

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“…This was interpreted under the assumption that the mixing free energy between the polymer segments was not a linear function of the solvent composition. This behavior was also investigated by Tanaka et al, 39 Kim et al, 40 Schild et al, 41 and Winnik et al…”

Section: Swelling Kinetics Of the Pnipaam/gelatin Hybrid Gels In Varimentioning

confidence: 56%

Effect of gelatin on the swelling behavior of organic hybrid gels based on N‐isopropylacrylamide and gelatin

Lee¹,

Lee²

2005

J of Applied Polymer Sci

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Organic hybrid gels based on poly(N-isopropylacrylamide) and a natural polymer, gelatin, were prepared through two-step crosslinking with genipin or glutaraldehyde. The effects of the gelatin content on the swelling behaviors and physical properties of these hybrid gels were investigated. The results indicated that the swelling ratio decreased with an increase in the content of gelatin in these hybrid gels. The swelling ratio for the gel crosslinked by genipin was significantly smaller than that for the gel crosslinked by glutaraldehyde. The results also showed that the gel crosslinked with genipin had a higher crosslinking density and a higher gel strength.

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Section: Swelling Kinetics Of the Pnipaam/gelatin Hybrid Gels In Varimentioning

confidence: 56%

Effect of gelatin on the swelling behavior of organic hybrid gels based on N‐isopropylacrylamide and gelatin

Lee¹,

Lee²

2005

J of Applied Polymer Sci

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“…This interesting phase behavior of a dramatic dependence of the swelling volume on temperature and a discontinuous transition has attracted the interest of many researchers all over the world in past years. Studies on the thermodynamic behavior of this system (Marchetti et al, 1990;Sousa, 1993;Sousa, 1995;Nakamoto, et al, 1996), different potential applications (Wu et al, 1996;Jin, et al, 1995), and permeability to small solutes (Palasis & Gehrke, 1992;Mukae, et al, 1993) have been reported. The thermodynamics of polymer gels describes the swelling equilibrium as a result of two opposite contributions: the change in the free energy of mixing as the gel is in contact with a solvent and the change in the elastic free energy due to the elongation of the network as the gel swells, absorbing solvent (Ogata, 1995).…”

Section: Functional Hybrid Mesoporous Silica/poly(n-isopropylacrilamimentioning

confidence: 99%

Multifunctional Nanocomposites Based on Mesoporous Silica: Potential Applications in Biomedicine

Sousa¹,

Souza²,

Mohallem³

et al. 2011

Advances in Diverse Industrial Applications of Nanocomposites

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“…8,9 The properties of pNIPAAm hydrogels can be modified in several ways. For instance, the degree of swelling (DS) and the LCST values can be altered by cross-linking NIPAAm in the presence of comonomers of various degrees of hydrophilicity 10 -12 or by changing the medium properties through the addition of cosolvents, 13 salts, 14 or surfactants. 15 The response rate can be enhanced by preparing hydrogels with a porous structure, 16,17 containing dangling chains, 18 or, finally, by copolymerizing NIPAAm with suitable monomers.…”

Section: Introductionmentioning

confidence: 99%

Effect of montmorillonite on the properties of thermosensitive poly(N‐isopropylacrylamide) composite hydrogels

Bignotti

Sartore

Penco

et al. 2004

J of Applied Polymer Sci

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Thermosensitive composite hydrogels containing various amounts of sodium montmorillonite (NaMM) and poly(N-isopropylacrylamide) (pNIPAAm) were synthesized. Their equilibrium degree of swelling (DS) was measured in NaCl solutions of different ionic strength and at various temperatures. The DS decreased when increasing the clay content and no substantial shift in the phase transition temperature was noticed. The composite hydrogels investigated had a NaMM content ranging between 1.0 and 5.7 wt % (in 0.1M NaCl at 25°C). A considerable enhancement in the response to thermal stimuli was observed for NaMM contents Ͼ2-3 wt %. It is suggested that when the NaMM concentration approaches a critical value, the clay platelets can inhibit the formation of the hydrophobic skin layer that hinders shrinking in conventional pNIPAAm hydrogels. The effect of montmorillonite on the mechanical properties of the hydrogels was investigated by uniaxial compression tests, which showed that the modulus increases with the NaMM content.

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Swelling of poly(N-isopropylacrylamide) gels in water-alcohol (C1-C4) mixed solvents

Cited by 168 publications

References 2 publications

Effect of gelatin on the swelling behavior of organic hybrid gels based on N‐isopropylacrylamide and gelatin

Effect of gelatin on the swelling behavior of organic hybrid gels based on N‐isopropylacrylamide and gelatin

Multifunctional Nanocomposites Based on Mesoporous Silica: Potential Applications in Biomedicine

Effect of montmorillonite on the properties of thermosensitive poly(N‐isopropylacrylamide) composite hydrogels

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