Copolymers of acrylic acid with urea

Eritsyan, M. L.; Gyurdzhyan, L. A.; Melkonyan, L. T.; Akopyan, G. V.

doi:10.1134/s1070427206100223

Cited by 9 publications

(9 citation statements)

References 1 publication

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“…Figure b shows the FTIR spectra of the copolymers developed in the absence of at least one of the comonomers. The copolymer of acrylic acid with urea (1/1/1/0) presented an FTIR spectrum that was very similar to the one obtained and reported by Eritsyan et al . According to these authors, the most expected reaction between acrylic acid and urea is the formation of a salt as the result of the interaction between the carboxylic group of AA with the amino group of urea.…”

Section: Resultssupporting

confidence: 85%

“…According to Eritsyan et al , Eq. 2 can explain the peak positioned at 1622 cm −1 , related to the interaction between NH 3 + and HCOO − groups.…”

Section: Resultsmentioning

confidence: 99%

“…Reactions were performed in jacketed glass flasks of 200 ml equipped with a temperature controller, an automatic agitator and a condenser. The stirring speed was kept equal to 300 rpm in all reactions, while the reaction temperature was maintained at 80 C and the reaction time was always equal to 2 h. Copolymerization conditions were determined in accordance with Wang (1974), Spychaj (1989), Eritsyan et al (2006) and Pinto et al (2012) [16,[24][25][26]. Although the initial solutions were always homogeneous, it is important to highlight that the final product was biphasic, containing a lighter and less viscous liquid phase and a heavier viscous liquid phase, which contained the copolymer.…”

Section: Copolymerization Reactionsmentioning

confidence: 99%

“…The product presented low solubility in water and proved to be useful for treatment of uremic animals and for the slow release of urea. More recently, Eritsyan et al studied the rheological characteristics of aqueous solutions of copolymers of acrylic acid and urea prepared with a similar process. These authors studied some mechanistic aspects of the reaction in dilute aqueous solutions and showed that the produced copolymers were branched and poorly soluble in common organic solvents.…”

Section: Introductionmentioning

confidence: 99%

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Free‐radical polymerization of urea, acrylic acid, and glycerol in aqueous solutions

Fernandes

Pinto

Albuquerque

et al. 2015

Polymer Engineering & Sci

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The main objective of the present study is to produce copolymers of urea, acrylic acid, and glycerol through aqueous solution free‐radical polymerizations and analyze the structural, thermal, rheological, and release properties of the obtained materials. To do this, aqueous solution copolymerizations were performed in different reaction conditions and the obtained copolymers were characterized by Fourier transform infrared spectroscopy, differential scanning calorimetry, rheological analyses, thermogravimetry, gel permeation chromatography, and rates of urea release in distilled water. The obtained results indicate that all constituents of the reacting mixture (potassium persulfate, glycerol, urea, and acrylic acid) affect the characteristics of the produced copolymers. In particular, it is shown that urea can be incorporated into the final copolymer through the proposed reaction scheme, that glycerol promotes crosslinking of polymer chains and that the obtained copolymer materials can be used in agricultural applications. POLYM. ENG. SCI., 55:1219–1229, 2015. © 2015 Society of Plastics Engineers

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Section: Resultssupporting

confidence: 85%

“…According to Eritsyan et al , Eq. 2 can explain the peak positioned at 1622 cm −1 , related to the interaction between NH 3 + and HCOO − groups.…”

Section: Resultsmentioning

confidence: 99%

Section: Copolymerization Reactionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Free‐radical polymerization of urea, acrylic acid, and glycerol in aqueous solutions

Fernandes

Pinto

Albuquerque

et al. 2015

Polymer Engineering & Sci

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“…The final reacting mixture contained 3.00 g of potassium persulfate, 39.80 g of urea, 23.86 g of acrylic acid and 3.00 g of glycerol. Reactions were performed in a 500-mL glass flask, with mechanical stirring of 300 rpm, temperature of 80 °C and time of 2 h, in accordance with previous experimental studies [18,[25][26][27][28] . As the final copolymer medium was biphasic (a lighter and less viscous liquid phase and a heavier viscous liquid phase, which contained the copolymer), continuous stirring of the copolymer feed was necessary to prevent heterogeneous and varying feed conditions.…”

Section: Coating Of Urea Granulesmentioning

confidence: 99%

Coating of urea granules by in situ polymerization in fluidized bed reactors

et al. 2019

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ObstractThe main objective of the present work is to produce and characterize urea granules coated with polymers prepared with aqueous solutions of acrylic acid and glycerol. Both coating and drying of urea granules were performed in a fluidized bed reactor. Fourier transform infrared spectroscopy analyses indicated the presence of poly(acrylic acid) and acrylic acid / glycerol copolymers on the granule coating and the formation of chemical bonds between urea and the polymer coating. Scanning electron microscopy images showed that the original and coated urea granules presented different characteristics, reinforcing the idea that coating occurs in the fluidized bed. Finally, rates of urea release showed that the coated granules presented slightly slower rates of urea dissolution in water due to the presence of the coating layer. Therefore, it is shown that it is possible to produce coated urea granules through in-situ polymerization onto the granule surface using a fluidized bed.

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