両親媒性ゲルの極性溶媒中での膨潤のキネティックス

Sakohara, Shuji; Takioka, Tomohiro; Nikai, Teruo; Takatani, Kohei

doi:10.1252/kakoronbunshu.29.62

Cited by 8 publications

(7 citation statements)

References 12 publications

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“…Measurement of the Shear Modulus. The shear modulus of cylinder-shaped hydrogels was measured by compression. , A weight was loaded onto the hydrogels, which was vertically placed in water at 10 °C, in a length direction. The shear modulus, μ [Pa], of the hydrogels was evaluated from the linear relation d P = 3μ(d l / l ) between changes in stress d P and length d l / l .…”

Section: Methodsmentioning

confidence: 99%

Novel Synthesis of Macroporous Poly(N-isopropylacrylamide) Hydrogels Using Oil-in-Water Emulsions

Tokuyama

Kanehara

2007

Langmuir

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Porous N-isopropylacrylamide (NIPA) hydrogels having a unique structure, that is, spherelike cavities distributed randomly and a homogeneous network in the gel phase, were successfully synthesized by means of an emulsion templating method; this method involves the synthesis of NIPA gels in an oil-in-water (O/W) emulsion by free radical copolymerization with a cross-linker, followed by washing (removal) of the dispersed oil as a pore template (porogen). The synthesis conditions, O/W volume ratio, amount of added surfactant, and monomer concentration affect the internal pore structure, equilibrium swelling, and swelling/shrinking kinetics. A porous hydrogel swollen at 10 degrees C has a pore diameter distribution in the range of 1-40 microm, which was observed with a scanning electron microscope. Scanning electron micrographs and swelling degree reveal that the pore size and porosity can be adjusted by varying the O/W volume ratios and surfactant amounts. The porous hydrogels show very rapid swelling/shrinking in accordance with the temperature swing. The fast response is attributed to the convection flow of water through the macropores. In addition to a faster response gel, the emulsion templating method can yield potentially intelligent gels in which the pores function as spaces for reaction, separation, and storage.

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Section: Methodsmentioning

confidence: 99%

Novel Synthesis of Macroporous Poly(N-isopropylacrylamide) Hydrogels Using Oil-in-Water Emulsions

Tokuyama

Kanehara

2007

Langmuir

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“…The morphology of semi-IPN improves the strength of the macroporous hydrogels. From the Flory theory, the l increases with an increase in the volume fraction of the polymers [32][33][34]. An increase in / m leads to a decrease in the volume fraction of the polymers.…”

Section: Swelling and Mechanical Propertiesmentioning

confidence: 99%

Preparation of macroporous poly(N-isopropylacrylamide) hydrogels using a suspension–gelation method

Sato

Noma

Tokuyama

2015

European Polymer Journal

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“…In this study, structural changes in the DMAA‐ graft ‐oligo(NIPAM) gel were investigated via the monitoring of the temperature dependence of the diffusivity of rhodamine B as a model material through the gel. The DMAA gel is amphiphilic, and its swelling degree is almost independent of the temperature, the composition of the solvent, and the pH of solution 16, 17. In this study, the effect of the cross‐linker in the preparation of the gel was not investigated; in other words, the effective pore size of the network of the DMAA gel was not considered.…”

Section: Introductionmentioning

confidence: 99%

“…The DMAA gel is amphiphilic, and its swelling degree is almost independent of the temperature, the composition of the solvent, and the pH of solution. 16,17 In this study, the effect of the cross-linker in the preparation of the gel was not investigated; in other words, the effective pore size of the network of the DMAA gel was not considered. We focused on the structural changes in the gel network upon heating.…”

Section: Introductionmentioning

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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両親媒性ゲルの極性溶媒中での膨潤のキネティックス

Cited by 8 publications

References 12 publications

Novel Synthesis of Macroporous Poly(N-isopropylacrylamide) Hydrogels Using Oil-in-Water Emulsions

Novel Synthesis of Macroporous Poly(N-isopropylacrylamide) Hydrogels Using Oil-in-Water Emulsions

Preparation of macroporous poly(N-isopropylacrylamide) hydrogels using a suspension–gelation method

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

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