Super water absorbing polymeric gel from chitosan, citric acid and urea: Synthesis and mechanism of water absorption

Narayanan, Abathodharanan; Ravishankar, K.; Sangeetha, Elanchezhian; Dhamodharan, R.

doi:10.1016/j.carbpol.2018.03.028

Cited by 75 publications

(33 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The authors hypothesized that the water absorption demonstrated by these materials results from the physical crosslinks consisting of electrovalent bonds, macro pores, and other morphological features. The highest water absorbency, which was comparable with other synthetic superabsorbent materials, such as diaper, was obtained for the CS crosslinked with citric acid-urea adduct (CHCAUR, Figure 5 ) [ 51 ]. It was prepared by hydrothermal synthesis at 100 °C in the weight ratio of 1:2:2 (CS: citric acid: urea).…”

Section: Strategies For Fabricating Cs Hydrogels and Their Potentisupporting

confidence: 57%

“…Novel superabsorbent hydrogels were prepared by ionotropic gelation of CS with EDTA-urea and citric acid-urea adducts while heating in aqueous media [ 50 , 51 ] ( Table 1 , entries 18–19). The authors hypothesized that the water absorption demonstrated by these materials results from the physical crosslinks consisting of electrovalent bonds, macro pores, and other morphological features.…”

Section: Strategies For Fabricating Cs Hydrogels and Their Potentimentioning

confidence: 99%

See 1 more Smart Citation

A Mini-Review on Chitosan-Based Hydrogels with Potential for Sustainable Agricultural Applications

Michalik

Wandzik

2020

Polymers

View full text Add to dashboard Cite

Agriculture is an important sector of the economy, but this industry consumes significant amounts of water, which is a precious and limited natural resource. Irrigation techniques and efforts to mitigate water usage influence the growth, survival, and yield of crops. However, superabsorbent polymers in combination with fertilizers can be employed to obtain sustained release of nutrients and improved water retention capacity of the soil. Despite significant recent progress in this area involving synthetic polyacrylate hydrogels, there are no industrially applicable solutions exhibiting similar performance using natural biopolymers or synthetic polymers enriched with natural components. This review focuses on biodegradable chitosan-based hydrogels (both natural and semi-synthetic), and discusses their potential agricultural and horticultural applications. The methods for synthesizing hydrogels via physical or chemical crosslinking, and the resulting functional properties of recently reported hydrogels, such as water retention and release of active ingredients, are presented herein.

show abstract

Section: Strategies For Fabricating Cs Hydrogels and Their Potentisupporting

confidence: 57%

Section: Strategies For Fabricating Cs Hydrogels and Their Potentimentioning

confidence: 99%

A Mini-Review on Chitosan-Based Hydrogels with Potential for Sustainable Agricultural Applications

Michalik

Wandzik

2020

Polymers

View full text Add to dashboard Cite

show abstract

“…In spite of possessing quite a few merits of chitosan films, reduced mechanical properties is a main shortcoming, especially after wet absorption [61]. Thus, hygroscopicity is considered as one of the essential qualities of a chitosan film or coating [62]. In this respect, water vapor absorption (WVA), swelling degree (SD), and water activity (WA) values of all chitosan/bacterial cellulose films were measured and tabulated in Table 2.…”

Section: Resultsmentioning

confidence: 99%

The Impact of Cross-linking Mode on the Physical and Antimicrobial Properties of a Chitosan/Bacterial Cellulose Composite

2019

View full text Add to dashboard Cite

The bacteriostatic performance of a chitosan film is closely related to its ionic and physical properties, which are significantly influenced by the mode of cross-linking. In the current work, chitosan with or without bacterial cellulose was cross-linked with borate, tripolyphosphate, or the mixture of borate and tripolyphosphate, and the composite films were obtained by a casting of dispersion. Mechanical measurements indicated that different modes of cross-linking led to varying degrees of film strength and elongation increases, while the films treated with the borate and tripolyphosphate mixture showed the best performance. Meanwhile, changes in the fractured sectional images showed a densified texture induced by cross-linkers, especially for the borate and tripolyphosphate mixture. Measurements of Fourier transform infrared showed the enhanced interaction between the matrix polymers treated by borate, confirmed by a slight increase in the glass transitional temperature and a higher surface hydrophobicity. However, the reduced antimicrobial efficiency of composite films against E. coli, B. cinerea, and S. cerevisiae was obtained in cross-linked films compared with chitosan/bacterial cellulose films, indicating that the impact on the antimicrobial function of chitosan is a noteworthy issue for cross-linking.

show abstract

“…318,324 It is also used for the development of different materials as biodegradable polymers whose properties including the mechanical ones have been investigated. [325][326][327][328][329][330][331][332][333][334][335][336][337][338][339][340][341] 2.4.1 Crystal structure. The optimized crystal structure of anhydrous citric acid, COOH-CH 2 -C(OH)(COOH)-CH 2 -COOH, is drawn in Fig.…”

Section: Anhydrous Citric Acidmentioning

confidence: 99%

Organic acids under pressure: elastic properties, negative mechanical phenomena and pressure induced phase transitions in the lactic, maleic, succinic and citric acids

Colmenero

2020

Mater. Adv.

View full text Add to dashboard Cite

show abstract

Super water absorbing polymeric gel from chitosan, citric acid and urea: Synthesis and mechanism of water absorption

Cited by 75 publications

References 39 publications

A Mini-Review on Chitosan-Based Hydrogels with Potential for Sustainable Agricultural Applications

A Mini-Review on Chitosan-Based Hydrogels with Potential for Sustainable Agricultural Applications

The Impact of Cross-linking Mode on the Physical and Antimicrobial Properties of a Chitosan/Bacterial Cellulose Composite

Organic acids under pressure: elastic properties, negative mechanical phenomena and pressure induced phase transitions in the lactic, maleic, succinic and citric acids

Contact Info

Product

Resources

About