Permeation mechanism for a thermo-sensitive composite membrane composed of porous glass and N-isopropylacrylamide.

Tsuji, T.; Konno, Mikio; Sato, Seiichiro

doi:10.1252/jcej.23.447

Cited by 19 publications

(9 citation statements)

References 9 publications

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“…The walls of the glass plates with holes were treated with chlorodimethylvinylsilane to introduce double bonds on the wall surface. 17 The gel was synthesized by radical polymerization. The preparation procedure was as follows.…”

Section: Methodsmentioning

confidence: 99%

Thermosensitive properties of semi‐IPN gel composed of amphiphilic gel and thermosensitive polymer in buffer solution

Takahashi

Sakohara

2011

J of Applied Polymer Sci

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In this study, a semi-interpenetrating polymer network (semi-IPN) gel comprising a crosslinked amphiphilic N,N-dimethylacrylamide-co-N-isopropylacrylamide gel and interpenetrating thermosensitive poly(Nisopropylacrylamide) (poly(NIPAM)) was prepared. Their thermosensitive behaviors in a buffer solution comprising sodium chloride, sodium citrate, and sodium dodecyl sulfate, which are generally used in biochips, were investigated. At low temperatures, the gel in the buffer solution was absolutely transparent. However, when the gel was heated, it became milky white or opaque without changes in the gel size. It is well known that the network or crosslink distribution of the transparent gel is homogeneous macroscopically, whereas that of the opaque gel is inhomogeneous; in other words, the network of the opaque gel consists of coarse and dense parts. The structural changes in the gel network were confirmed by the temperature dependence of the permeability of the buffer solution through the semi-IPN gel membrane. The permeability increased stepwise when the gel became opaque due to heating. The structural changes in the semi-IPN gel network depended on the compositions of the buffer solution and gel, i.e., the copolymerization ratio of NIPAM in the gel and the content of the poly(NIPAM) molecules in the gel. These results suggest that the thermosensitive behaviors of the semi-IPN gel strongly depend on the interactions between the copolymerized NIPAM in the gel network and the poly(NIPAM) molecules.

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Section: Methodsmentioning

confidence: 99%

Thermosensitive properties of semi‐IPN gel composed of amphiphilic gel and thermosensitive polymer in buffer solution

Takahashi

Sakohara

2011

J of Applied Polymer Sci

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“…[9] Reversible poration in synthetic systems has been recently reported in electrochemically active inorganic membranes [10] and in thermoreversibly porous systems. [11] Received: October 8, 2006 Published online: February 27, 2007 Figure 4. Schematic representation illustrating: A) collapse of an ionic liquid surfactant copolymer brush upon exposure to a poor solvent and B) the corresponding spinodal decomposition of a cross-linked bicontinuous gel to form open-cell porous material upon exposure to a poor solvent.…”

mentioning

confidence: 99%

Solvent‐Reversible Poration in Ionic Liquid Copolymers

2007

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An open and closed case: Polymerization of microemulsions stabilized by surfactants based on ionic liquids leads to cross‐linked polymer gels which can be transformed into porous polymers by anion exchange of the ionic liquid moiety. These porous polymers can be converted back into polymer gels by immersion in organic solvents. Subsequent immersion of these gels in water then affords the porous polymers once more (see scheme).

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“…The gel membrane was prepared in the center hole of a gel holder composed of three glass plates, as shown in Figure 3(a). The walls of the glass plates with holes were treated with chlorodimethylvinylsilane to introduce double bonds on the wall surface 19. The gel was prepared by radical polymerization.…”

Section: Methodsmentioning

confidence: 99%

“…The walls of the glass plates with holes were treated with chlorodimethylvinylsilane to introduce double bonds on the wall surface. 19 The gel was prepared by radical polymerization. The preparation procedure was as follows.…”

Section: Measurement Of the Temperature Dependence Of Diffusivity Of mentioning

confidence: 99%

Thermosensitive properties of amphiphilic N,N‐dimethylacrylamide gel grafted with thermosensitive oligo(N‐isopropylacrylamide)

Takahashi

Sakohara

2011

J of Applied Polymer Sci

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In this study, thermosensitive oligo(N-isopropylacrylamide) [oligo(NIPAM)] chains were grafted to amphiphilic N,N-dimethylacrylamide (DMAA) gel networks to form DMAA-graft-oligo(NIPAM) gels. The gels were prepared by copolymerizing oligo(NIPAM) macromonomers with DMAA. On heating, the gel caused structural changes in the gel network without causing a large volume change. The effects of the molecular weights and copolymerization ratios of oligo(NIPAM) on the temperature dependence of the swelling properties of the gel were investigated. Furthermore, to confirm the structural changes in the gel network, the temperature dependence of the diffusivity of rhodamine B through the gel membrane was investigated. Oligo(NIPAM) monomers with different molecular weights (M n ) of 2300, 7000, and 13,000 were prepared. The transition from hydrophilic to hydrophobic for oligo(NIPAM) of M n 7000 and 13,000 was observed at about 32 C, while that of M n 2300 was observed between 32 and 45 C. The gels grafted with oligo(NIPAM)s of M n 7000 and 13,000 shrank above 32 C; in other words, thermosensitivity was clearly observed. On the other hand, the swelling behavior of the gel grafted with oligo(NIPAM) of M n 2300 was similar to that of the DMAA gel; that is, negligible shrinkage of the gel was observed on heating. The diffusivity of rhodamine B through the gel membrane grafted with oligo(NIPAM) of M n 2300 increased stepwise between 40 and 45 C. These results suggest that by selecting the molecular weights and copolymerization ratios of oligo(NIPAM), structural changes in the gel network occur without an overall volume change.

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Permeation mechanism for a thermo-sensitive composite membrane composed of porous glass and N-isopropylacrylamide.

Cited by 19 publications

References 9 publications

Thermosensitive properties of semi‐IPN gel composed of amphiphilic gel and thermosensitive polymer in buffer solution

Thermosensitive properties of semi‐IPN gel composed of amphiphilic gel and thermosensitive polymer in buffer solution

Solvent‐Reversible Poration in Ionic Liquid Copolymers

Thermosensitive properties of amphiphilic N,N‐dimethylacrylamide gel grafted with thermosensitive oligo(N‐isopropylacrylamide)

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