Nanocomposites based on poly(acrylamide-co-acrylate) and cellulose nanowhiskers

Spagnol, Cristiane; Rodrigues, Francisco H. A.; Neto, Alberto G.V.C.; Pereira, Antonio G.B.; Fajardo, André R.; Radovanovic, Eduardo; Rubira, Adley F.; Muniz, Edvani C.

doi:10.1016/j.eurpolymj.2011.12.005

Cited by 125 publications

(63 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The absorbance at 2948 cm −1 is assigned to -C-H stretching of the acrylate group. The peaks at 1674 cm −1 and 1565 cm −1 are assigned to C=O stretching of the acrylamide groups and acrylate groups, respectively [2,21].…”

Section: Ftir Spectramentioning

confidence: 99%

See 1 more Smart Citation

Optimized synthesis and swelling properties of a pH-sensitive semi-IPN superabsorbent polymer based on sodium alginate-g-poly(acrylic acid-co-acrylamide) and polyvinylpyrrolidone and obtained via microwave irradiation

Tally

Atassi

2015

J Polym Res

View full text Add to dashboard Cite

A pH-sensitive superabsorbent hydrogel composite, sodium alginate-g-poly(acrylic acid-co-acrylamide) in the presence of polyvinylpyrrolidone (PVP), was prepared using the semi-interpenetrating polymer network (semi-IPN) technique and microwave irradiation. Potassium peroxodisulfate (KPS) was used as an initiator, N,N,N′,N′-tetramethylene diamine (TEMED) as a reaction accelerator, and N,N′-methylene bisacrylamide (MBA) as a crosslinker. The Taguchi method was employed to optimize the synthetic conditions for the hydrogel based on water absorbency. The Taguchi L 9 (3 4 ) orthogonal array was selected for the experimental design. The mass concentrations of MBA (C MBA ), KPS (C KPS ), and sodium alginate (C NaAlg ) as well as the molar ratio of acrylamide to acrylic acid (R AM/AA ) were chosen as the four factors in the design. Based on an analysis of variance in the test results, the optimal conditions were found to be 0.18 g/L of MBA, 0.60 g/L of KPS, 7.73 g/L of NaAlg, and R AM/AA = 1:1. The maximum water absorbency of the optimized hydrogel was found to be 1551 g/g. The relative thermal stability of the hydrogel in comparison with sodium alginate was proven using thermogravimetric analysis. The prepared hydrogel was characterized by FTIR and scanning electron microscopy (SEM). The influences of environmental parameters such as the pH and the ionic strength of the solution on the water absorbency were also investigated.

show abstract

Section: Ftir Spectramentioning

confidence: 99%

“…SAPs are widely used in many fields, such as hygiene products, agriculture, and soil conditioning [2]. They can also be used in controlled drug-delivery systems, artificial snow, swelling rubber, and in waste treatments where water absorbency or water retention is important [3].…”

Section: Introductionmentioning

confidence: 99%

Optimized synthesis and swelling properties of a pH-sensitive semi-IPN superabsorbent polymer based on sodium alginate-g-poly(acrylic acid-co-acrylamide) and polyvinylpyrrolidone and obtained via microwave irradiation

Tally

Atassi

2015

J Polym Res

View full text Add to dashboard Cite

show abstract

“…However, the use of natural fibers at nanoscale, improves the hydrogel mechanical properties due to they act as matrix reinforcement (Aouada, de Moura, Orts & Mattoso, 2011;Guilherme et al, 2015;Krishnan K, Jose, K. R & George, 2015;Missoum, Belgacem & Bras, 2013) without affecting the swelling ability (Rodrigues et al, 2013). In fact, the nanofibers have allowed to improve the swelling ability due to the capacity of forming hydrogen bridges, elasticity and available natural fiber surface (Nitta et al, 2015;Zhou et al, 2013;Spagnol, Rodrigues, Pereira et al, 2012)the XRD pattern indicated that the nanofibrils crystallinity was as high as 90%. A 2 4-1 fractional factorial design was employed to evaluate the effect of acrylic acid/chitosan molar ratio, crosslinker, initiator, and filler in the swelling capacity of hydrogel composites.…”

Section: Nanofibers In Hydrogelsmentioning

confidence: 99%

Natural fibers for hydrogels production and their applications in agriculture

Serna-Cock¹,

Guancha-Chalapud²

2017

Acta Agron.

View full text Add to dashboard Cite

This paper presents a review on hydrogels applied to agriculture emphasizing on the use of natural fibers. The objectives were to examine, trends in research addressed to identify natural fibers used in hydrogels development and methods for modifying natural fibers, understand factors which determine the water retention capacity of a hydrogel. Consequently, this paper shows some methodologies used to evaluate the hydrogels efficiency and to collect in tables, relevant information in relation to methods of natural fibers modification and hydrogel synthesis. It was found that previous research focused on hydrogels development processed with biodegradable polymers such as starch, chitosan and modified natural fibers, cross-linked with potassium acrylate and acrylamide, respectively. In addition, current researches aimed to obtaining hydrogels with improved properties, which have allowed a resistance to climatic variations and soil physicochemical changes, such as pH, presence of salts, temperature and composition. In fact, natural fibers such as sugarcane, agave fiber and kapok fiber, modified with maleic anhydride, are an alternative to obtain hydrogels due to an increasing of mechanical properties and chemically active sites. However, the use of natural nanofibers in hydrogels, has been a successful proposal to improve hydrogels mechanical and swelling properties, since they give to material an elasticity and rigidity properties. A hydrogel efficiency applied to soil, is measured throughout properties as swellability, mechanical strength, and soil water retention. It was concluded that hydrogels, are an alternative to the current needs for the agricultural sector.Key words: Hydrogels, methods of modifying fiber, nanofibers, superabsorbent, water retention capacity. ResumenEn el presente artículo se presenta una revisión de literatura sobre hidrogeles aplicados a la agricultura, haciéndose mayor énfasis en el uso de fibras vegetales. Los objetivos fueron examinar las tendencias en la investigación, identificar las fibras naturales utilizadas en el desarrollo de hidrogeles, mostrar los métodos de modificación de fibras naturales para la elaboración de hidrogeles, entender los factores que determinan la capacidad de retención de agua de un hidrogel, mostrar algunas metodologías empleadas para evaluar la eficiencia de un hidrogel y recopilar en tablas, información relevante en relación a métodos de modificación de fibras naturales y de síntesis de hidrogeles. Se encontró que las investigaciones se orientan al desarrollo de hidrogeles elaborados a bases de polímeros biodegradables como almidón, quitosano y fibras vegetales modificadas, entrecruzadas con acrilato de potasio y acrilamida. Además, las investigaciones apuntan a la obtención de hidrogeles con propiedades mejoradas, que permitan resistir las variaciones climáticas y los cambios fisicoquímicos del suelo como el pH, la presencia de sales, temperatura y composición. Fibras naturales como caña de azúcar, fibra de agave y fibra de kapoc, modificadas con ...

show abstract

“…There is increasing interest in the development of biodegradable plastics, biobased polymer products and plant derived composite materials, also referred to as "green" composites (Khalil et al, 2012;La Mantia and Morreale, 2011;Rosa et al, 2010;Spagnol et al, 2012), which may perfectly fit into the biorefinery scenario. The biorefinery concept has been applied to a variety of biomass sources, such as forest residue biorefinery (Mabee et al, 2005), wheat straw biorefinery (Deswarte et al, 2008), palm oil and oil palm biomass-based biorefinery (Chew and Bhatia, 2008), and corn biorefinery (Haung et al, 2008).…”

Section: Figurementioning

confidence: 99%

Valorization of agroindustrial solid residues and residues from biofuel production chains by thermochemical conversion: a review, citing Brazil as a case study

Virmond

Rocha

Moreira

et al. 2013

Braz. J. Chem. Eng.

View full text Add to dashboard Cite

-Besides high industrial development, Brazil is also an agribusiness country. Each year about 330 million metrics tons (Mg) of biomass residues are generated, requiring tremendous effort to develop biomass systems in which production, conversion and utilization of bio-based products are carried out efficiently and under environmentally sustainable conditions. For the production of biofuels, organic chemicals and materials, it is envisaged to follow a biorefinery model which includes modern and proven green chemical technologies such as bioprocessing, pyrolysis, gasification, Fischer-Tropsch synthesis and other catalytic processes in order to make more complex molecules and materials on which a future sustainable society will be based. This paper presents promising options for valorization of Brazilian agroindustrial biomass sources and residues originating from the biofuel production chains as renewable energy sources and addresses the main aspects of the thermochemical technologies which have been applied.

show abstract

Nanocomposites based on poly(acrylamide-co-acrylate) and cellulose nanowhiskers

Cited by 125 publications

References 41 publications

Optimized synthesis and swelling properties of a pH-sensitive semi-IPN superabsorbent polymer based on sodium alginate-g-poly(acrylic acid-co-acrylamide) and polyvinylpyrrolidone and obtained via microwave irradiation

Optimized synthesis and swelling properties of a pH-sensitive semi-IPN superabsorbent polymer based on sodium alginate-g-poly(acrylic acid-co-acrylamide) and polyvinylpyrrolidone and obtained via microwave irradiation

Natural fibers for hydrogels production and their applications in agriculture

Valorization of agroindustrial solid residues and residues from biofuel production chains by thermochemical conversion: a review, citing Brazil as a case study

Contact Info

Product

Resources

About