Superabsorbent Polymers

Buchholz, Fredric L.

doi:10.1002/0471440264.pst356

Cited by 22 publications

(27 citation statements)

References 33 publications

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“…Finally, superabsorbents are hydrophilic polymers capable of absorbing large quantities of water in comparison with their own weight, and they are relevant in several bulk applications 26, 27. In more specific applications, especially in biotechnology and drug‐release, polymers that switch between the hydrophilic water‐absorbing and hydrophobic water‐repelling states are needed.…”

Section: Introductionmentioning

confidence: 99%

Photoswitchable Superabsorbency Based on Nanocellulose Aerogels

Kettunen

Silvennoinen

Houbenov

et al. 2010

Adv Funct Materials

246

191

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Chemical vapor deposition of a thin titanium dioxide (TiO 2 ) fi lm on lightweight native nanocellulose aerogels offers a novel type of functional material that shows photoswitching between water-superabsorbent and water-repellent states. Cellulose nanofi brils (diameters in the range of 5-20 nm) with native crystalline internal structures are topical due to their attractive mechanical properties, and they have become relevant for applications due to the recent progress in the methods of their preparation. Highly porous, nanocellulose aerogels are here fi rst formed by freeze-drying from the corresponding aqueous gels. Well-defi ned, nearly conformal TiO 2 coatings with thicknesses of about 7 nm are prepared by chemical vapor deposition on the aerogel skeleton. Weighing shows that such TiO 2 -coated aerogel specimens essentially do not absorb water upon immersion, which is also evidenced by a high contact angle for water of 140 ° on the surface. Upon UV illumination, they absorb water 16 times their own weight and show a vanishing contact angle on the surface, allowing them to be denoted as superabsorbents. Recovery of the original absorption and wetting properties occurs upon storage in the dark. That the cellulose nanofi brils spontaneously aggregate into porous sheets of different length scales during freeze-drying is relevant: in the water-repellent state they may stabilize air pockets, as evidenced by a high contact angle, in the superabsorbent state they facilitate rapid water-spreading into the aerogel cavities by capillary effects. The TiO 2 -coated nanocellulose aerogels also show photooxidative decomposition, i.e., photocatalytic activity, which, in combination with the porous structure, is interesting for applications such as water purifi cation. It is expected that the present dynamic, externally controlled, organic/inorganic aerogels will open technically relevant approaches for various applications.

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Section: Introductionmentioning

confidence: 99%

Photoswitchable Superabsorbency Based on Nanocellulose Aerogels

Kettunen

Silvennoinen

Houbenov

et al. 2010

Adv Funct Materials

246

191

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“…Superabsorbent polymers (SAPs) are hydrophilic polymers with lightly cross‐linked three‐dimensional network structures that can absorb large amounts of water 1,2 . Due to their superior absorption properties, the SAPs are widely used in a range of fields such as hygiene products, drug‐delivery systems, 3 soil additives for agricultural storage materials, 4 and sensors of environmental pollutants 3–5 .…”

Section: Introductionmentioning

confidence: 99%

Superabsorbent polymer with enhanced gel strength and heat resistance using itaconic acid‐based oligomer

Kim

Kwon

Kim

et al. 2023

Polymers for Advanced Techs

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The preparation of an itaconic acid-based oligomer and its polymerization with acrylic acid via aqueous solution copolymerization are described herein for application as novel superabsorbent polymers (SAPs). The structure of the SAP is characterized using Fourier transform infrared (FT-IR) spectroscopy. In addition, the absorption properties of the SAPs with various oligomer contents and degrees of monomer neutralization are evaluated by measuring the free absorbency, centrifuge retention capacity (CRC), and absorbency under load (AUL) in 0.9 wt% saline solution. Further, the gel strengths and thermal stabilities are examined via rheological thermo gravimetric analyses. The results demonstrate that the introduction of the IA-based oligomer into the SAP network is improves the AUL, gel strength, and thermal stability of the SAP. We found the best performance of an SAP using IA-based oligomer with a CRC of 36.7 and AUL of 22.7 g/g.

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“…Super absorbent polymers have gained interest due to their excellent absorption to water, hence making them diverse for food, packaging, sanitary, concrete technology, wastewater treatment, mining and medical applications [1][2][3][4]. SAPs tend to absorb and preserve substantial proportion of liquids and water due to its elevated affinity with water in their precise geometry [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Preparation of a nano-clay-based super absorbent polymer composite for water absorption applications

Memon¹,

Akhtar²,

Shahbaz³

et al. 2022

Mehran Univ. res. j. eng. technol.

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Incorporation of naturally occurring fillers like clay and other mineral improves mechanical, chemical, and physical properties. Herein, we report for synthesized nano-clay based superabsorbent polymer by graft copolymerization of acrylic acid and acrylamide This study focusses the effects of filler (nano-clay), crosslinking agent and initiator concentration on the absorption of the copolymer. Six specimens with varying percentages i.e., 30, 32, 34, 36, 38 and 40 wt. % were supplemented with nano-clay in the matrix of the polymer. Time based immersion was carried out in tap, de-ionized and brine for 2 to 24 h the superabsorbent polymer with 36 wt.% of nano-clay absorbed highest percentage i.e., up to 18 folds after submerging in tap water for 2 hours. Detrimental trend of absorption was observed in specimens with 38 and 40 wt. % that could be due to surge in formation of physical and chemical cross-linking networks in the polymer matrix. However, suspension of superabsorbent polymer composite in brine resulted in decreased absorbency. Such course was also observed for specimens containing 36 wt. % of nano-clay after submerging for 4, 6 and 24 hours. Thermal stability analysis also revealed that the polymer composite supplemented with 38 wt. % of nano-clay exhibited ameliorated stability to 350 ℃.

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Superabsorbent Polymers

Cited by 22 publications

References 33 publications

Photoswitchable Superabsorbency Based on Nanocellulose Aerogels

Photoswitchable Superabsorbency Based on Nanocellulose Aerogels

Superabsorbent polymer with enhanced gel strength and heat resistance using itaconic acid‐based oligomer

Preparation of a nano-clay-based super absorbent polymer composite for water absorption applications

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