Effect of surfactants on the porous structure of poly(N-isopropylacrylamide) hydrogels prepared by an emulsion templating method

Tokuyama, Hideaki; Sumida, Hiroshi; Kanehara, Akifumi; Nii, Susumu

doi:10.1007/s00396-008-1964-1

Cited by 12 publications

(9 citation statements)

References 11 publications

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“…This was confirmed by scanning electron microscope and a stereomicroscope in our previous study, which revealed consistency in oil microdroplet size between the emulsion gel and the pregel emulsion. 11,12 The oil microdroplets in the pregel emulsion prepared under various conditions were observed with a stereomicroscope, and the photographs are shown in Figure 2. Stability was examined for an emulsion with PEGMEA/MBAA = 500:100 mol/m 3 , ϕ oil = 0.33, and C s = 0.1 g/(cm 3 of oil).…”

Section: ' Results and Discussionmentioning

confidence: 99%

“…The oil microdroplet diameters decreased significantly with increasing C s and decreased slightly with increasing ϕ oil , which is similar to the behavior observed previously. 11, 12 The oil microdroplet diameters can thus be adequately adjusted by varying C s .…”

Section: ' Results and Discussionmentioning

confidence: 99%

“…In this study, we focus on hydrophilic polymer gels as the host for the extractant, and we propose novel emulsion gel adsorbents for metal adsorption. These emulsion gels are hydrogels containing randomly distributed oil microdroplets and are prepared by the emulsion–gelation method, − which involves free-radical polymerization in the aqueous phase of an oil-in-water (O/W) emulsion. The emulsion gel adsorbents are made of a hydrophilic polymer gel with randomly distributed microdroplets of an organic extractant, as schematically shown in Figure ; the microdroplets of the extractant are retained in the polymer gel through a liquid–liquid (water–oil) phase separation.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Novel Emulsion Gel Adsorbents and Their Adsorption Properties for Heavy-Metal Ions

Tokuyama

Yoshida

2011

Ind. Eng. Chem. Res.

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Novel emulsion gel adsorbents were developed for metal adsorption. Poly[poly(ethylene glycol) methyl ether acrylate] [poly(PEGMEA)] was used as a nonionic hydrophilic polymer, and 2-ethylhexylphosphoric acid mono-2-ethylhexyl ether (EHPNA) was used as an organophosphorus extractant for rare metal ions. Poly(PEGMEA) hydrogel containing randomly distributed oil microdroplets of EHPNA were prepared by the emulsion–gelation method using oil-in-water emulsions under various monomer concentrations, oil volume fractions, and surfactant concentrations. The emulsion gel successfully adsorbed In(III) ions used as a representative metal. Mutual separation of In(III) and Zn(II) ions and repeated adsorption were successful because of the pH dependence of the metal–extractant complexation. The emulsion gel has a higher degree of compressive deformation and abrasion resistance than a conventional (nonemulsion) hydrogel and shows potential for use in practical separations.

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Section: ' Results and Discussionmentioning

confidence: 99%

Section: ' Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation of Novel Emulsion Gel Adsorbents and Their Adsorption Properties for Heavy-Metal Ions

Tokuyama

Yoshida

2011

Ind. Eng. Chem. Res.

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“…Tokuyama et al . succeeded in preparing porous poly( N ‐isopropylacrylamide) using water‐in‐oil (W/O) emulsions stabilized by poly(ethylene glycol)‐type surfactants . Jiang et al .…”

Section: Introductionmentioning

confidence: 99%

Preparation of porous polymer materials using water‐in‐oil gel emulsions as templates

Hori

Sano

Suzuki

et al. 2018

Polymer International

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Water-in-oil gel emulsions consisting of water and n-butyl acrylate were successfully prepared using N-3-hydroxybutylcarbonyl-L-isoleucylaminooctadecane and sorbitan monooleate (Span 80) as gelator and surfactant, respectively. Stable gel emulsions were formed using aqueous phase fractions (APFs) ranging from 10 to 90 vol%. Creaming, flocculation and coalescence were not observed. Low-temperature polymerization of the gel emulsions with a redox initiator gave the corresponding low-density, highly porous poly(n-butyl acrylate)s (PBAs). The microstructures of the PBAs were observed using scanning electron microscopy. All the porous PBAs comprised numerous spherical structures whose sizes could be controlled by adjusting the gel emulsion APF. The densities and porosities of the porous PBAs decreased and increased, respectively, with increasing APF. The absorption capacities of the porous PBAs in organic solvents were studied. The porous PBAs selectively absorbed kerosene from water instantly and the kerosene could then be recovered by physical compression of the PBAs. Further porous polymers were prepared from gel emulsions containing styrene, methyl methacrylate (MMA) or 2-ethylhexyl acrylate (EHA) as continuous oil phases. The order of absorption capacity and swelling ratio in kerosene was poly(EHA) > PBA ≫ poly(MMA). Porous copolymers were also prepared from gel emulsions containing a mixture of EHA and MMA as the oil phase. Their absorption and swelling in liquids could be controlled by changing the ratio of EHA and MMA in the gel emulsions. poly(EHA-co-MMA) (6:4) was the best polymer when absorption capacity, swelling ratio and durability were simultaneously considered.

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“…In this study, we have compared these counterion binding equilibria using Manning's "ioncondensation theory"[1] and "two-variable theory" [9] to clarify the nature of any other interactions occurring in conjunction with the electrostatic interactions. Information pertaining to the nature of the hydrophobic interactions of uncharged neutral polymers and their hydrophobic hydration behaviors could be very useful for clarifying their counterion binding equilibria and selective Page 6 of 36 A c c e p t e d M a n u s c r i p t 5 adsorption behaviors towards hydrophobic ions [28][29][30][31]. Furthermore, this information could be used to develop a deeper understanding of the structural stabilizing mechanisms of biopolymers [32][33][34][35], which could have a significant impact on the design of functional polymers such as biomedical materials, polymer coagulants, and semipermeable membranes [36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Multinuclear NMR studies on the effect of electrostatic and hydrophobic interactions on bindings to counterions to weakly acidic and basic polyelectrolytes

Maki

Yoshida

Nariai

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Effect of surfactants on the porous structure of poly(N-isopropylacrylamide) hydrogels prepared by an emulsion templating method

Cited by 12 publications

References 11 publications

Preparation of Novel Emulsion Gel Adsorbents and Their Adsorption Properties for Heavy-Metal Ions

Preparation of Novel Emulsion Gel Adsorbents and Their Adsorption Properties for Heavy-Metal Ions

Preparation of porous polymer materials using water‐in‐oil gel emulsions as templates

Multinuclear NMR studies on the effect of electrostatic and hydrophobic interactions on bindings to counterions to weakly acidic and basic polyelectrolytes

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