Preface

Brannon-Peppas, Lisa; Harland, Ronald S.

doi:10.1016/b978-0-444-88654-5.50004-2

Cited by 36 publications

(38 citation statements)

References 0 publications

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“…Superabsorbent polymers originated in the United States in the 80's [1] as water retention agents in agriculture. Also, considering the vast desert areas, in certain cases able to be sources of energy [2], these areas, with the application of these polymers, may have some use in agriculture, a way to combat desertification [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of synthesis parameters and of temperature of swelling on water absorption by a superabsorbent polymer

Rosa¹,

Casquilho²

2012

Fuel Processing Technology

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Section: Introductionmentioning

confidence: 99%

Effect of synthesis parameters and of temperature of swelling on water absorption by a superabsorbent polymer

Rosa¹,

Casquilho²

2012

Fuel Processing Technology

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“…The fact that reference polyester PET R does not behave similarly, even though its surface is also increasingly negatively charged, could be attributed to the different nature of its carboxyl end groups compared with that of PET RM. Although acrylic acid (component of PNIAA and therefore M ) is a weak acid, in its polymeric form it uses its multiple carboxyl groups to attract large amounts of water [35], especially when fully ionized. Therefore, the difference in absorption times is more evident for PET RM than for PET R. For PET RCM, the lowest total absorption time is also observed at pH 8, like for PET RM.…”

Section: Resultsmentioning

confidence: 99%

Polyester textile functionalization through incorporation of pH/thermo-responsive microgels. Part II: polyester functionalization and characterization

et al. 2011

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A new approach to functionalize the surface of polyester textiles is described in this study. Functionalization was achieved by incorporating pH/temperature-responsive polyelectrolyte microgels into the textile surface layer using UV irradiation. The aim of functionalization was to regulate polyester wettability according to ambient conditions by imparting stimuli-responsiveness from the microgel to the textile itself. Microgels consisted of pH/thermo-responsive microparticles of poly(N-isopropylacrylamide-co-acrylic acid) either alone or complexed with the pH-responsive natural polysaccharide chitosan. Scanning Electron Microscopy, X-ray Photoelectron Spectroscopy, ζ-potential measurements, and topographical analysis were used for surface characterization. Wettability of polyester textiles was assessed by dynamic wetting, water vapor transfer, and moisture regain measurements. One of the main findings showed that the polyester surface was rendered pH-responsive, both in acidic and alkaline pH region, owing to the microgel incorporation. With a marked relaxation in their structure and an increase in their microporosity, the functionalized textiles exhibited higher water vapor transfer rates both at 20 and 40 °C, and 65% relative humidity compared with the reference polyester. Also, at 40 °C, i.e., above the microgel Lower Critical Solution Temperature, the functionalized polyester textiles had lower moisture regains than the reference. Finally, the type of the incorporated microgel affected significantly the polyester total absorption times, with an up to 300% increase in one case and an up to 80% decrease in another case. These findings are promising for the development of functional textile materials with possible applications in biotechnology, technical, and protective clothing.

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“…(A2), into the constitutive equation for the zzcomponent of T, to obtain dT zz dt + T zz = 2 α (1 + ν ∞ ) + 2 (ν 0 − ν ∞ ) 2 1 − 2ν ∞ e − 1−2ν 0 1−2ν∞ t .…”

Section: Appendix: Late Force Relaxation In the Case ψ 1: Analytical mentioning

confidence: 99%

Prediction of the effects of constitutive viscoelasticity on stress-diffusion coupling in gels

Larobina

Greco

2012

The Journal of Chemical Physics

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Modeling of stress/diffusion coupling in gels, originally developed by Doi for the case where the solid component of the gel is a linear elastic network, is here extended to the case of a linear viscoelastic solid component, thereby allowing for a mechanism of intrinsic relaxation. The extended model is solved for a cylindrical gel subjected to unconfined uniaxial compression. Depending on the respective values of the two characteristic times, i.e., diffusive and viscoelastic, measurable quantities like axial force and external radius of the cylindrical gel are calculated to display different qualitative behaviors. Calculated results for the case of uniaxial traction are also reported, which compare favorably with some available experimental results.

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Preface

Cited by 36 publications

References 0 publications

Effect of synthesis parameters and of temperature of swelling on water absorption by a superabsorbent polymer

Effect of synthesis parameters and of temperature of swelling on water absorption by a superabsorbent polymer

Polyester textile functionalization through incorporation of pH/thermo-responsive microgels. Part II: polyester functionalization and characterization

Prediction of the effects of constitutive viscoelasticity on stress-diffusion coupling in gels

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