A new polymer/clay nano-composite hydrogel with improved response rate and tensile mechanical properties

Xiang, Yuan-Qing; Peng, Ziwen; Chen, Dajun

doi:10.1016/j.eurpolymj.2006.04.003

Cited by 160 publications

(72 citation statements)

References 29 publications

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“…Osmocapillary phase separation may change the wettability of the gel surface (Fig.5a). The gel and its solvent can have different surface property if the gel has a low swelling ratio, or if the gel carries some functional particles like clay [30]. A droplet of liquid immiscible with the solvent may have different wettability towards the solvent and towards the gel.…”

Section: Osmocapillary Phase Separation In Phenomena Of Practical Sigmentioning

confidence: 99%

Osmocapillary phase separation

Liu

Suo

2016

Extreme Mechanics Letters

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Abstract:A covalent network of polymer can imbibe a solvent to form a gel. In a cavity on the surface of the gel, capillary force may suck the solvent out of the gel to form a pure liquid phase. We show that such osmocapillary phase separation occurs when capillarity balances osmosis, and when the diffusion of solvent in the gel prevails over the condensation of solvent from the vapor.Osmocapillary phase separation can occur even when the gel is isolated from the vapor, or when the solvent is nonvolatile. We relate osmocapillary phase separation to phenomena of practical significance, including the wettability of gels, the transparency of gels, the liquid bridge at the tip of an atomic force microscope, the adhesion between a gel and another substance, the surface morphology of gels, and the production of tight oil.

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Section: Osmocapillary Phase Separation In Phenomena Of Practical Sigmentioning

confidence: 99%

Osmocapillary phase separation

Liu

Suo

2016

Extreme Mechanics Letters

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“…Therefore, there is a need for slow swelling rate and good deformability that can overcome blocking near bore and migrate into the deep reservoirs. To improve the mechanical strength of traditional hydrogels, researchers have made efforts to develop chemically modified materials with novel structures, such as topological gels [14], nanocomposite gel [15][16][17][18], double network gel [19], polymer microsphere composite hydrogel [20,21], hydrophobic association hydrogel [22,23], and tetrapolyethylene glycol hydrogel [24].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Hydrophobic-Associated Microspheres for Deep Profile Control in Offshore Oilfields

Jin

et al. 2018

International Journal of Polymer Science

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Microspheres have excellent sealing performances such as injectivity, bridging-off, deep migration, and deformation performances, but their plugging effects are limited by the fast swelling rate and poor viscoelasticity. In this study, we synthesized a novel modified microsphere with polymerizable surfactant monomers and cationic monomers. We investigated the influence factors on the swelling performance and rheological properties of the microspheres and explored the ways to improve the plugging performance of hydrophobic-associating microspheres. The association behaviors in aqueous media of poly(acrylamide-comethacry loyloxyethyl trimethyl ammonium chloride-co-n-dodecyl poly(etheroxy acrylate) P(AM-DMC-DEA) are proven to be mediated by the DEA content. Moreover, the hydrophobic association interaction has a strong effect on the performance of microspheres such as swelling properties, the rheological performance, and plugging properties. The swelling properties of microsphere studies exhibited the slow swelling rate. The rheological performance measurements showed significant improvements; yield stress, and creep compliance increased rapidly from 404 to 2060 Pa and 3.89 × 10 −4 to 1.41 × 10 −2 1/Pa, respectively, with DEA content in microspheres rising from 0.0% to 0.22%. The plugging properties of microspheres were enhanced by the slow swelling performance and good viscoelasticity.

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“…In the previous researches, PNIPA/clay nanocomposite hydrogels exhibited excellent mechanical properties. Xiang et al [13] prepared A new polymer/clay nano-composite hydrogel, it has significantly improved tensile mechanical properties. Liu [14] reported high clay content nanocomposite hydrogels with surprising mechanical strength, of which tensile strength can reach 1 MPa, and elongation at break can run up to 1400%.…”

Section: Introductionmentioning

confidence: 99%

Effects of Silica Content on the Properties of Poly(N-isopropylacrylamide) / Silica Nanocomposite Hydrogels

Wu¹,

Zhang

Zhang³

2017

Proceedings of the 2017 6th International Conference on Energy, Environment and Sustainable Development (ICEESD 2017)

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Poly(N-isopropylacrylamide) is a representative thermosensitive polymer, whose hydrogels have broad applications. But poly(N-isopropylacrylamide) hydrogels are weak and brittle. To get higher strength hydrogels, in this paper, silica sol was utilized as nanoparticle reinforcer source to construct poly(N-isopropylacrylamide)/silica nanocomposite hydrogels by in situ polymerization. By means of scanning electron microscopy, nano-silica was found dispersed evenly on the surface of PNIPA polymer network. Encouragingly, the compression strength of composite hydrogels have been enhanced more than 60% owing to the introduction of nano-silica. Obviously, the more silica sol this composite hydrogels contain ,the longer gelation time they obtain. Compared to pure PNIPA hydrogels, nanocomposite hydrogels have faster deswelling speed at high temperature. And the lower critical solution temperature of nanocomposite hydrogels with different content of silica hydrogels was found between 33.5 o C to 34.5 o C. Because silica sol is facial to composite with hydrogel, this study provides a simple way for nanocomposite reinforced hydrogels preparation.

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A new polymer/clay nano-composite hydrogel with improved response rate and tensile mechanical properties

Cited by 160 publications

References 29 publications

Osmocapillary phase separation

Osmocapillary phase separation

Preparation and Characterization of Hydrophobic-Associated Microspheres for Deep Profile Control in Offshore Oilfields

Effects of Silica Content on the Properties of Poly(N-isopropylacrylamide) / Silica Nanocomposite Hydrogels

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