Synthesis and Properties of N-Maleyl Chitosan-Cross-Linked Poly(Acrylic Acid-co-Acrylamide) Superabsorbents

Yu, Yueqin; Liu, Lingxiu; Kong, Yanyan; Zhang, Erchi; Liu, Yanping

doi:10.1007/s10924-011-0340-2

Cited by 31 publications

(23 citation statements)

References 23 publications

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“…Similar Gaussian distribution behavior is also reported by other studies [24][25][26]. The initial increase in the swelling capacity might be attributed to the optimum amount of radicals to produce high molecular weight SAP with sufficient density of hydrophilic groups (-COOH, -CONH, -COO -) and gel strength [25]. The decrease in the swelling capacity after optimum swelling capacity (228.45 (g/g)) could be due to the synthesis of low molecular weight SAP [27] which caused low gel strength [18,22,23] and hence, fast dissolution.…”

Section: Effect Of Initiator Concentration On Swelling Capacitysupporting

confidence: 91%

“…It is evident from the Figure 2 that the swelling capacity of copolySAP first increases with the initiator concentration and then decreases. Similar Gaussian distribution behavior is also reported by other studies [24][25][26]. The initial increase in the swelling capacity might be attributed to the optimum amount of radicals to produce high molecular weight SAP with sufficient density of hydrophilic groups (-COOH, -CONH, -COO -) and gel strength [25].…”

Section: Effect Of Initiator Concentration On Swelling Capacitysupporting

confidence: 86%

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Synthesis of Superabsorbent Polymer (SAP) via Industrially Preferred Route

Rafiq

Syed

2016

J. Basic Appl. Sci.

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The assigned study is dedicated to the synthesis, improvement and characterization of acrylic-based superabsorbent polymers (SAPs) which can be used in versatile applications notably in disposable diapers and pharmaceutics. The industrially preferred solution polymerization route and low cost monomers were used to synthesize SAPs. Homopolymer and copolymer based SAPs were prepared with varying amount of cross-linker and initiator concentrations and compared for swelling rate with a commercially available SAP sample. Swelling capacity linearly decreases with increase in cross-linker content for both the synthesized SAPs samples whereas it first increases and then decreases with initiator content for the synthesized copolymer SAP. Swelling kinetics of the synthesized and commercial SAPs were modelled using model equation proposed by Omidian et al. Both the synthesized SAPs showed substantial increase in swelling capacity whereas copolymer SAP exhibited the highest swelling rate (rate parameter 2.78 min) when compared to homopolymer SAP and the commercially available SAP samples. Accordingly, the copolymer SAP may find its application in disposable diapers or pharmaceutics where the higher swelling rate is of prime importance. Copolymer and commercially available SAPs depicted significant decrease in swelling capacity even at very low saline solution concentration (0.01 %).

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Section: Effect Of Initiator Concentration On Swelling Capacitysupporting

confidence: 91%

Section: Effect Of Initiator Concentration On Swelling Capacitysupporting

confidence: 86%

Synthesis of Superabsorbent Polymer (SAP) via Industrially Preferred Route

Rafiq

Syed

2016

J. Basic Appl. Sci.

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“…Great efforts have been made to modify their swelling ability, swelling strength and swelling rate in all areas of their application over the past decades (5)(6)(7). In our previous work (8,9), we reported the synthesis of natural-based superabsorbent, the grafting polymerization of hydrophilic (acrylic acid and acrylamide) monomers onto chitosan, and a biocompatible and biodegradable superabsorbent, poly(maleic anhydride-co-acrylic acid) (P(MA-co-AA)) with N-maleoyl chitosan as a cross-linker, to try to solve the environmental compatibility issues of superabsorbents. But the application field of superabsorbents is somewhat strictly limited because of their poor mechanical properties (10).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of sodium alginate/poly(acrylic acid) double-network superabsorbent

Zhou

Yang

et al. 2015

E-Polymers

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A tough double-network (DN) superabsorbent was synthesized by a two-step method using N,N-methylenebisacrylamide as a covalent cross-linker for one monomer [acrylic acid (AA)], Ca 2+ (CaCl 2 ) as an ionic cross-linker for the other monomer (sodium alginate [SA]) and ammonium peroxodisulfate as the redox initiator. The optimized experimental conditions for the absorbency in deionized water were determined according to orthogonal experiments. Unlike conventional chemical cross-linked singlenetwork superabsorbents, SA/poly(acrylic acid) (PAA) DN superabsorbents exhibit superb mechanical properties. Compared with the tensile strength of PAA-only superabsorbents, that of SA/PAA DN superabsorbents showed an approximately 371.9% increase with increasing amount of 6 wt.% SA. We also investigated the capacity of SA/PAA DN superabsorbents to remove heavy metal ions. It was found that the addition of SA can truly increase the metal ion removal capacity of the PAA superabsorbents and that the affinity order was Pb 2+ > Zn 2+ .

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“…Superabsorbent polymers (SAP) can be described as cross-linked hydrogel networks [ 1 , 2 , 3 ]. SAP owe its ability to absorb water up to hundreds of times higher than their own mass to high osmotic pressure caused by the accumulation of trapped ions in the SAP structure [ 4 , 5 , 6 ]. The absorbed water causes the SAP to swell, thereby removing the ions from each other, which results in the reduction of the osmotic pressure [ 7 , 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

“…Assuming such a model of an interaction within SAP, its their absorption capacity is limited not only by lowering the osmotic pressure due to water absorption, but also by the influence of external pressures resulting from the change of the SAP volume [ 3 , 4 ] and the alkalinity of the environment in which the absorption takes place [ 11 ]. In the case of a loss of balance between osmotic pressure within the SAP saturated with water, the internal stresses of concrete, and the influence of capillary forces in the porous medium, SAP is able to reduce its volume, i.e., to desorb water [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Dosing Method and Material Characteristics of Superabsorbent Polymers (SAP) on the Effectiveness of the Concrete Internal Curing

Woyciechowski

Kalinowski

2018

Materials

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This paper examines the influence of dosing method and material characteristic of superabsorbent polymers (SAP) used for internal curing, on the selected concrete properties. A new method of introducing SAP into the concrete mix and its impact on the shrinkage and compressive strength of concrete was studied. It was shown that the method of dosing SAP to the concrete mix and the differences in the properties of the tested SAPs have a significant impact on the course of changes of selected properties of the tested concrete composites. In order to compare tested series with each other and with other published results on the subject, a new method of including SAP mass content in the concrete mix, as a percentage of absorbed mixing water, was presented. The effectiveness of internal curing using different types of SAP under different dosing methods was presented as a percentage difference in tested concrete properties between modified series and reference series.

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Synthesis and Properties of N-Maleyl Chitosan-Cross-Linked Poly(Acrylic Acid-co-Acrylamide) Superabsorbents

Cited by 31 publications

References 23 publications

Synthesis of Superabsorbent Polymer (SAP) via Industrially Preferred Route

Synthesis of Superabsorbent Polymer (SAP) via Industrially Preferred Route

Synthesis and properties of sodium alginate/poly(acrylic acid) double-network superabsorbent

The Influence of Dosing Method and Material Characteristics of Superabsorbent Polymers (SAP) on the Effectiveness of the Concrete Internal Curing

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