Water and polymer dynamics in poly(hydroxyl ethyl acrylate-co-ethyl acrylate) copolymer hydrogels

Kyritsis, Apostolos; Spanoudaki, Anna; Pandis, C.; Hartmann, Lutz; Pelster, R.; Shinyashiki, Naoki; Hernández, José Carlos Rodríguez; Ribelles, J.L. Gómez; Pradas, Manuel Monleón; Pissis, P.

doi:10.1016/j.eurpolymj.2011.09.025

Cited by 12 publications

(2 citation statements)

References 39 publications

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“…Just after electrospinning, the hydroxylated membrane fabricated with the blend (MMA) 1002 - co -(HEMA) 1002 /(MA) 11709 - co -(HA) 7806 (50/50, w/w) was hydrophobic (see Figure E). It is well known that copolymers formed by hydrophilic and hydrophobic monomeric units can organize in hydrophobic and hydrophilic domains in the presence of water due to hydrophobic interactions. − Thus, to reorient the hydrophilic domains and introduce amphiphilic properties in the membrane, a thermal treatment (TT) was carried out. After electrospinning, the membrane (30 × 60 cm; Figure A) was cut in pieces of 11 × 16 cm and they were fixed on frames to avoid wrinkles and deformations during TT (Figure B).…”

Section: Resultsmentioning

confidence: 99%

Hydrophilic Nonwoven Nanofiber Membranes as Nanostructured Supports for Enzyme Immobilization

Medina-Castillo

Ruzic

Nidetzky

et al. 2022

ACS Appl. Polym. Mater.

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The high porosity, interconnected pore structure, and high surface area-to-volume ratio make the hydrophilic nonwoven nanofiber membranes (NV-NF-Ms) promising nanostructured supports for enzyme immobilization in different biotechnological applications. In this work, NV-NF-Ms with excellent mechanical and chemical properties were designed and fabricated by electrospinning in one step without using additives or complicated crosslinking processes after electrospinning. To do so, two types of ultrahigh-molecular-weight linear copolymers with very different mechanical properties were used. Methyl methacrylate- co -hydroxyethyl methacrylate (p(MMA)- co -p(HEMA)) and methyl acrylate- co -hydroxyethyl acrylate (p(MA)- co -p(HEA)) were designed and synthesized by reverse atom transfer radical polymerization (reverse-ATRP) and copper-mediated living radical polymerization (Cu 0 -MC-LRP), respectively. The copolymers were characterized by nuclear magnetic resonance ( 1 H-NMR) spectroscopy and by triple detection gel permeation chromatography (GPC). The polarity, topology, and molecular weight of the copolymers were perfectly adjusted. The polymeric blend formed by (MMA) 1002 - co -(HEMA) 1002 ( M w = 230,855 ± 7418 Da; M n = 115,748 ± 35,567 Da; PDI = 2.00) and (MA) 11709 - co -(HEA) 7806 ( M w = 1.972 × 10 6 ± 33,729 Da; M n = 1.395 × 10 6 ± 35,019 Da; PDI = 1.41) was used to manufacture (without additives or chemical crosslinking processes) hydroxylated nonwoven nanofiber membranes (NV-NF-Ms-OH; 300 nm in fiber diameter) with excellent mechanical and chemical properties. The morphology of NV-NF-Ms-OH was studied by scanning electron microscopy (SEM). The suitability for enzyme binding was proven by designing a palette of different surface functionalization to enable both reversible and irreversible enzyme immobilization. NV-NF-Ms-OH were successfully functionalized with vinyl sulfone (281 ± 20 μmol/g), carboxyl (560 ± 50 μmol/g), and amine groups (281 ± 20 μmol/g) and applied for the immobilization of two enzymes of biotechnological interest. Galactose oxidase was immobilized on vinyl sulfone-activated materials and carboxyl-activated materials, while laccase was immobilized onto amine-activated materials. These preliminary results are a promising basis for the application of nonwoven membranes in enzyme technology.

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Section: Resultsmentioning

confidence: 99%

Hydrophilic Nonwoven Nanofiber Membranes as Nanostructured Supports for Enzyme Immobilization

Medina-Castillo

Ruzic

Nidetzky

et al. 2022

ACS Appl. Polym. Mater.

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“…Secondly, even though in present of water at 35% wt LiTf in the ambient condition (~60% RH), its dielectric permittivity are lower than 35% wt LiTf at 40% RH condition. This might be occurred due to coupling effect between water and polymer segmental which are not enough to dissociate salt into cation and anion [17,18].…”

Section: Resultsmentioning

confidence: 99%

Effect of Salt Concentration and Humidity on the Ionic Conductivity of Poly(Vinylidene Fluoride–Hexafluoropropylene) (PVdF-HFP)

Alias¹,

Kudin²,

Zabidi³

et al. 2012

AMR

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Polymer electrolytes consist of poly(vinylidene fluoride –hexafluoropropylene) (PVDF-HFP) and lithium trifluoromethanesulfonate, LiTf (LiCF3SO3) were prepared by dissolving in dimethylformamide (DMF) using solution casting method and further dried in vacuum oven. The conductivity of each sample was investigated using electrochemical impedance spectroscopy (EIS) method. The samples were measured in two different environments viz. in humidity chamber (40% RH; 27°C) and at ambient condition (~60% RH; 27°C). The maximum conductivity obtained for the samples in humidity chamber was 8.05 × 10-5 S/cm with addition of 35 wt% of LiTf. Meanwhile, the highest conducting samples (with addition of 45 wt% of LiTf) exhibited the ambient condition temperature of 1.11 ×10-4 S/cm. Further increased salt concentration from the optimize concentration values has reduced the conductivity of the polymer electrolyte. Dielectric permittivity studies revealed that samples showed the non-Debye behaviors

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Autonomous Surface Reconciliation of a Liquid‐Metal Conductor Micropatterned on a Deformable Hydrogel

et al. 2020

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Spreading liquid droplets on solid surfaces is a core topic in physical chemistry with significant technological implications. Liquid metals, which are eutectic alloys of constituent metal atoms with low melting temperatures, are practically useful, but difficult to spread on solid surfaces because of their high surface tension. This makes it difficult to use liquid metals as deformable on‐board microcircuitry electrodes, despite their intrinsic deformability. In this study, it is discovered that eutectic gallium–indium (EGaIn) can be spread onto the surface of chemically cross‐linked hydrogels consisting of aliphatic alkyl chains with numerous hydroxyl groups (OH), thus facilitating the development of directly micropatterned EGaIn electrodes. More importantly, EGaIn patterned on a hydrogel autonomously reconciliates its surface to form a firm hydrogel interface upon mechanical deformation of the hydrogel. This autonomous surface reconciliation of EGaIn on hydrogels allows researchers to reap the benefits of chemically modified hydrogels, such as reversible stretching, self‐healing, and water‐swelling capability, thereby facilitating the fabrication of superstretchable, self‐healable, and water‐swellable liquid‐metal electrodes with very high conductance tolerance upon deformation. Such electrodes are suitable for a variety of deformable microelectronic applications.

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Water and polymer dynamics in poly(hydroxyl ethyl acrylate-co-ethyl acrylate) copolymer hydrogels

Cited by 12 publications

References 39 publications

Hydrophilic Nonwoven Nanofiber Membranes as Nanostructured Supports for Enzyme Immobilization

Hydrophilic Nonwoven Nanofiber Membranes as Nanostructured Supports for Enzyme Immobilization

Effect of Salt Concentration and Humidity on the Ionic Conductivity of Poly(Vinylidene Fluoride–Hexafluoropropylene) (PVdF-HFP)

Autonomous Surface Reconciliation of a Liquid‐Metal Conductor Micropatterned on a Deformable Hydrogel

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