Preparation, Solid-State NMR, and Physicochemical Characterization of Surprisingly Tough Open Cell PolyHIPEs Derived from 1-Vinyl-1,2,4-triazole Oil-in-Water Emulsions

Audouin, Fabrice; Birot, Marc; Pasquinet, Éric; Besnard, Olivier; Palmas, P.; Poullain, Didier; Deleuze, Hervé

doi:10.1021/ma200861j

Cited by 30 publications

(8 citation statements)

References 46 publications

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“…The surface areas are high when compared with other types of templated polymer which exhibit only macroporosity such as polyHIPEs (3 m 2 g À1 , 79% nominal porosity) indicating a predominantly mesoporous structure. 38 The surface areas increase with the concentration of 2 as expected. The trend is less clear for polymers of 1 with the 5% w/v sample showing an unexpectedly low surface area compared to the other samples.…”

Section: Resultssupporting

confidence: 74%

Using gel morphology to control pore shape

et al. 2014

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'Using gel morphology to control pore shape.', New journal of chemistry., 38 (3). pp. 927-932. Further information on publisher's website:http://dx.doi.org/10.1039/c3nj01295fPublisher's copyright statement: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. concentrations are compared. Small changes in the molecular structure of the gelator can therefore be used to produce polymeric materials with very different pore shapes, sizes and adsorption characteristics.

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Section: Resultssupporting

confidence: 74%

Using gel morphology to control pore shape

et al. 2014

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“…The extraordinarily high E D for N‐70‐ y in Figure D, ranging between 50 and 90 MPa, are unusual for polyHIPEs. The E D of 90 MPa for N‐70‐10 is of the same order of magnitude as those of relatively brittle polyHIPEs, with similar porosities, that are based upon unusually stiff polymers such as polydicyclopentadiene . The extraordinarily high compressive stresses at 70% strain, σ 70‐D , for the dry N‐70‐ y in Figure F (ranging between 23 and 31 MPa) are more than an order of magnitude larger than those in polystyrene‐based polyHIPEs …”

Section: Resultsmentioning

confidence: 87%

“…Hydrophilic polyHIPEs can be produced through: the post‐synthesis modification of hydrophobic polyHIPEs (from W/O HIPEs); the synthesis of bicontinuous, hydrogel‐filled, hydrophobic polyHIPEs; or the synthesis of hydrogel polyHIPEs (HG‐PHs) within oil‐in‐water (O/W) HIPEs. HG‐PHs have been based on 2‐hydroxyethyl methacrylate, acrylic acid, 1‐vinyl‐5‐aminotetrazole, acrylamide, styrene sulfonate, gelatin, and N ‐isopropyl acrylamide . Recent work has reported HG‐PH copolymers containing methacrylic acid (MAA) with water absorption capacities reaching 18 g g −1 .…”

Section: Introductionmentioning

confidence: 99%

Superabsorbent, High Porosity, PAMPS‐Based Hydrogels through Emulsion Templating

Kovačič

Silverstein

2016

Macromol. Rapid Commun.

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Swell! Superabsorbent, mechanically robust, high-porosity hydrogels based on poly(2-acrylamido-2-methyl-1-propanesulfonic acid) have been successfully synthesized by templating within high internal phase emulsions (HIPEs). These hydrogel polyHIPEs (HG-PHs) exhibit unusually high uptakes of water and of artificial urine through structure- and crosslinking-dependent hydrogel-swelling-driven void expansion. An HG-PH with 3.1 mmol g of highly accessible sulfonic acid groups exhibits a 7 meq NaOH ion exchange capacity per gram polymer and rapid dye absorption. The highly swollen HG-PHs do not fail at compressive strains of up to 60%, they retain water and recover their shapes upon the removal of stress. Unusually, the dry hydrogels have relatively high compressive moduli and achieve relatively high stresses at 70% strain.

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“…A number of different hydrogel polyHIPEs have been developed, many of which exhibit typical polyHIPE structures. Such hydrogel polyHIPEs have been based on HEMA, acrylic acid, 1‐vinyl‐5‐aminotetrazole, acrylamide, styrene sulfonate, gelatin and N ‐isopropyl acrylamide (NiPAAm) . The gelatin‐based and PNiPAAm‐based polyHIPEs exhibit thermo‐responsive behaviour .…”

Section: Introductionmentioning

confidence: 99%

High porosity, responsive hydrogel copolymers from emulsion templating

Ovadia

Silverstein

2015

Polymer International

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Hydrogels, three-dimensional hydrophilic polymer network structures, can absorb many times their dry weight in water. PolyHIPEs are highly porous polymers synthesized within high internal phase emulsions (HIPEs). Here, the water uptakes in novel hydrogel polyHIPE copolymers of hydroxyethyl methacrylate (HEMA, a non-ionic monomer) and methacrylic acid (MAA, an ionic monomer) were investigated. The PHEMA-based polyHIPE had a density of 0.14 g cm −3 , void diameters of 50-100 m and a void-dominated Fickian water uptake of around 10.4 g g −1 . The polyHIPE density increased, and the porous structure became less polyHIPE-like, with increasing MAA content, reflecting a reduction in the stability of the HIPE. The water uptake increased with increasing pH for all the copolymers and the water absorption mechanism changed from Fickian at pH 2 to anomalous, dominantly case II, at pH 10. The maximum uptake of 18.2 g g −1 at pH 10, for a HEMA to MAA mass ratio of 1/1, was ascribed to hydrogel-swelling-driven void expansion. The hydrogel's absorptive and responsive properties were amplified by the polyHIPE's porous structure. These results demonstrate that the compositions of hydrogel polyHIPE copolymers can be designed to enhance their water uptake.

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Preparation, Solid-State NMR, and Physicochemical Characterization of Surprisingly Tough Open Cell PolyHIPEs Derived from 1-Vinyl-1,2,4-triazole Oil-in-Water Emulsions

Cited by 30 publications

References 46 publications

Using gel morphology to control pore shape

Using gel morphology to control pore shape

Superabsorbent, High Porosity, PAMPS‐Based Hydrogels through Emulsion Templating

High porosity, responsive hydrogel copolymers from emulsion templating

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