Water uptake in chemically crosslinked poly(acrylamide-co-crotonic acid) hydrogels

Karadağ, Erdener; Üzüm, Ömer Barış; Saraydın, Dursun

doi:10.1016/j.matdes.2004.07.014

Cited by 58 publications

(36 citation statements)

References 21 publications

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“…This effect causes to the hydrogel matrix an expansion and the amount of water absorbed increases considerably as can be seen by the increase in the swelling curves (Karadag et al 2005). The set of results published previously by Spagnol et al (2012a, b) allows us to infer that despite of the incorporation of CNWs to changed the water uptake capacity, the responsible by the pH-sensitive characteristic is attributed only the hydrogel matrix, as observed here.…”

Section: Effect Of Cellulose Nanowhiskers On the Swelling Kineticssupporting

confidence: 81%

Superabsorbent hydrogel nanocomposites based on starch-g-poly(sodium acrylate) matrix filled with cellulose nanowhiskers

et al. 2012

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Superabsorbents hydrogel nanocomposites based on starch-g-poly(sodium acrylate) and cellulose nanowhiskers (CNWs) were synthesized. A set of experiments was performed to evaluate the influence of some factors such as NaAc/starch mass ratio, crosslinker, and nanowhiskers amount in the swelling capacity and swelling kinetics. Increasing the NaAc/starch mass ratio up to 7 leads to an increase in the water uptake at a maximum value, however, higher ratios decreased that value due to the increase of crosslinking points. Similarly, the incorporation of CNWs up to 10 wt% provided an improvement in the swelling due to the hydrophilic groups from cellobiose units. Further, the incorporation of CNWs diminishes the water uptake. Besides, the CNWs improved the mechanical properties. SEM images showed that CNWs increase the average porous size of composites. The composites presented good responsive behavior in relation to pH and salt presence allowing those materials suitable for many potential applications.

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Section: Effect Of Cellulose Nanowhiskers On the Swelling Kineticssupporting

confidence: 81%

Superabsorbent hydrogel nanocomposites based on starch-g-poly(sodium acrylate) matrix filled with cellulose nanowhiskers

et al. 2012

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“…Another parameter which is investigated in swelling studies is diffusion coefficient (D). In order to find this parameter ''the short time approximation method'' was used [25]. The diffusion coefficient of core-shell Hyd/CL/NPK formulation is obtained from Eq.…”

Section: Mechanism Of Water Uptake and Diffusion Coefficientmentioning

confidence: 99%

Hydrogel/clinoptilolite nanocomposite-coated fertilizer: swelling, water-retention and slow-release fertilizer properties

2015

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Preparation of a new core-shell slow-release fertilizer formulation was conducted through the coating of commercial NPK fertilizer with hydrogel/clinoptilolite (Hyd/CL) nanocomposite. The Hyd/CL nanocomposite was prepared from free radical polymerization of sodium alginate, acrylic acid, acrylamide, and clinoptilolite zeolite. The uniform coating on the surface of the fertilizer granules was verified by scanning electron microscopy. The swelling kinetics as well as the water-retention property and water absorption rate of the prepared samples was studied. Furthermore, the release of fertilizer from Hyd/CL nanocomposite-coated fertilizer granules into soil showed that the Hyd/CL nanocomposite layer around the fertilizer granules caused the system to liberate the nutrient in a more controlled manner (lower than 57 % of loaded fertilizer on the 30 days) than that with the uncoated fertilizer. The overall results eventually suggested that the hydrogel nanocomposite designed in this work can be used as a coating on granular fertilizer compounds for application in agriculture due to its water-retention and slow-release properties.

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“…N,N'-methylene-bisacrylamide (MBAAm), linear polymers are first formed in the solution during the fast propagation step, and later crosslinked with other molecules through their pendent double bonds and additional monomer units [Stepto, 1998]. According to Karadag et al, 2005 the polymerization of vinyl monomers, such as AAm and MBAAm in the presence of ammonium persulfate and N,N,N',N'-tetramethylethylene-diamine (TEMED), is first initiated by the reaction between ammonium persulfate and TEMED, in which the TEMED molecule is left with an unpaired valance electron. The activated TEMED molecule can combine with an AAm and/or crosslinker molecule, in which the unpaired electron is transferred to the monomeric units so that they then become reactive.…”

Section: Mechanism To Form and Prepare The Paam And MC Hydrogelsmentioning

confidence: 99%

Biodegradable Hydrogel as Delivery Vehicle for the Controlled Release of Pesticide

Aouada¹,

Moura²,

Mattoso³

2011

Pesticides - Formulations, Effects, Fate

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Water uptake in chemically crosslinked poly(acrylamide-co-crotonic acid) hydrogels

Cited by 58 publications

References 21 publications

Superabsorbent hydrogel nanocomposites based on starch-g-poly(sodium acrylate) matrix filled with cellulose nanowhiskers

Superabsorbent hydrogel nanocomposites based on starch-g-poly(sodium acrylate) matrix filled with cellulose nanowhiskers

Hydrogel/clinoptilolite nanocomposite-coated fertilizer: swelling, water-retention and slow-release fertilizer properties

Biodegradable Hydrogel as Delivery Vehicle for the Controlled Release of Pesticide

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