PREPARATION, CHARACTERIZATION AND APPLICATION OF POLY(HYDROXYETHYL METHACRYLATE -co- ACRYLAMIDE) AS NON IONIC WATER-SOLUBLE POLYCHELATOGEN

Marambio, Oscar G.; Pizarro, Guadalupe del C.; Jeria, Manuel; Huerta, Margarita

doi:10.4067/s0717-97072003000100008

Cited by 6 publications

(10 citation statements)

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“…In the washing and enrichment methods, the polymer–herbicide in the cell solution is defined as where C r is the herbicide concentration in the retentate (the cell solution, V c , after a filtrate volume of V f has been passed) and C 0 is the initial herbicide concentration in the cell. The filtration factor Z , expressed in relative units, is another convenient characteristic of the process:18–21 …”

Section: Resultsmentioning

confidence: 99%

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Synthesis, characterization and application of poly[(1‐vinyl‐2‐pyrrolidone)‐co‐(2‐hydroxyethyl methacrylate)] as controlled‐release polymeric system for 2,4‐dichlorophenoxyacetic chloride using an ultrafiltration technique

Pizarro¹,

Marambio²,

Jeria‐Orell³

et al. 2008

Polymer International

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BACKGROUND: Polymers supporting chemicals used in agriculture have recently been developed to overcome the serious environmental problems of conventional agrochemicals. The success of these formulations is based on a suitable choice of polymer support. Degradable polymeric hydrogels are of particular interest. The gradual release of the bioactive agent can be achieved by hydrolytic or enzymatic cleavage of the linking bond. RESULTS: In this context, poly[(1-vinyl-2-pyrrolidone)-co-(2-hydroxyethyl methacrylate)] [poly(NVP-co-HEMA)] has been used as a bioactive carrier reagent. Herein, we report a controlled-release system with the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) using an ultrafiltration system. Hydrolysis was studied by testing the release at various pH values. A high release with poly(NVP-co-HEMA)-2,4-D was observed at pH = 7 and 10 after two days (Z = 2). The release percentage of copolymer-herbicide increased at pH = 10. It showed release values between 79.0 and 94.5%. Poly(NVP-co-HEMA)-herbicide can release a bioactive compound in aqueous solution at pH = 3, 7 and 10. CONCLUSION: Based on the results of homogeneous hydrolysis, it is argued that the herbicide release rate depends on the pH of the reaction environment. This functional polymer could be employed as a biodegradable material for applications in agrichemical release.

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Section: Resultsmentioning

confidence: 99%

“…For the LPR technique, a membrane filtration system was employed to test the controlled release of bioactive agent 2,4‐D from the poly(NVP‐ co ‐HEMA)–herbicide polymeric system. More details have been published previously 18–20…”

Section: Methodsmentioning

confidence: 99%

Synthesis, characterization and application of poly[(1‐vinyl‐2‐pyrrolidone)‐co‐(2‐hydroxyethyl methacrylate)] as controlled‐release polymeric system for 2,4‐dichlorophenoxyacetic chloride using an ultrafiltration technique

Pizarro¹,

Marambio²,

Jeria‐Orell³

et al. 2008

Polymer International

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“…In the washing and enrichment methods, the metal ion retention in the cell solution is defined as where C r is the metal ion concentration in the retentate (the cell solution volume, V c , after a filtrate volume of V f has been passed) and C o is the initial metal ion concentration in the cell. The filtration factor Z , expressed in relative units, is another convenient characteristic of the process 19–23, 25 The retention depends on the polymer complex dissociation, which is generally described by a reversible reaction: In systems with inorganic ion concentrations that are relatively small with respect to the polymer concentration, only the formation of ML may be taken into account.…”

Section: Resultsmentioning

confidence: 99%

Metal ion retention using the ultrafiltration technique: Preparation, characterization of the water‐soluble poly(1‐vinyl‐2‐pyrrolidone‐co‐itaconic acid) and its metal complexes in aqueous solutions

Pizarro

Marambio

Jeria‐Orell

et al. 2008

J of Applied Polymer Sci

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Radical copolymerization of 1-vinyl-2-pyrrolidone with itaconic acid at different feed monomer ratios (75-25 mol %) were investigated. The copolymers were characterized by elemental analysis, Fourier transform infrared (FTIR), 1 H and 13 C NMR spectroscopy. The copolymer composition was determined from elemental analysis and found to be statistical copolymers. Additionally, viscosimetric measurements, molecular weight, and polydispersity have been determined. The metal complexation of poly(1-vinyl-2-pyrrolidone-co-itaconic acid) for the metal ions such as Cr(III), Co (II), Zn(II), Ni(II), Cu(II), Cd(II), and Fe(III) were investigated at pH 3, 5, and 7 in aqueous solution. The metal ion interaction with hydrophilic polymers was determined as a function of the pH and filtration factor. Poly(1-vinyl-2-pyrrolidone-co-itaconic acid) showed a high affinity for the metal ions at pH 5 and 7. The poly(NVP-co-IA), with a copolymer composition of 29 : 71 mol % (PVA-3), presented the highest metal ion retention values, particularly at higher pHs, at which the carboxylic acid groups are nonprotonated and could easily coordinate with the metal ions. According to the interaction pattern obtained, Cr(II), Zn(II), Pb(II), and Ni(II) formed the most stable complexes at pH 7. The thermal behaviors of the copolymer and polymer metal complex were characterized using differential scanning calorimetry (DSC) and thermogravimetry techniques under nitrogen atmosphere. The copolymers present high thermal stability and do not present glass transition in DSC curves between 25 and 5008C.

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“…In the washing and enrichment methods, the retention of metal ions ( R ) in the cell solution is defined as follows: where C r is the metal‐ion concentration in the retentate (the cell solution after a filtrate volume of V f has been passed) and C 0 is the initial metal‐ion concentration in the cell. Z , expressed in relative units, is another convenient characteristic of the process:19–24 where V c is the volume of the cell solution. The retention depends on polymer complex dissociation, which is generally described by a reversible reaction: where M is the metal ion and L is the polymer with complexing groups (ligands).…”

Section: Resultsmentioning

confidence: 99%

Nonionic water‐soluble polymer: Preparation, characterization, and application of poly(1‐vinyl‐2‐pyrrolidone‐co‐hydroxyethylmethacrylate) as a polychelatogen

Pizarro¹,

Marambio²,

O³

et al. 2006

J of Applied Polymer Sci

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ABSTRACT:The free-radical copolymerization of watersoluble poly(1-vinyl-2-pyrrolidone-co-hydroxyethylmethacrylate) was carried out with a feed monomer ratio of 75:25 mol %, and the total monomer concentration was 2.67M. The synthesis of the copolymer was carried out in dioxane at 70°C with benzoyl peroxide as the initiator. The copolymer composition was obtained with elemental analysis and 1 H-NMR spectroscopy. The water-soluble polymer was characterized with elemental analysis, Fourier transform infrared, 1 H-and 13 C-NMR spectroscopy, and thermal analysis. Additionally, viscosimetric measurements of the copolymer were performed. The thermal behavior of the copolymer and its complexes were investigated with differential scanning calorimetry (DSC) and thermogravimetry techniques under a nitrogen atmosphere. The copolymer showed high thermal stability and a glass transition in the DSC curves. The separation of various metal ions by the water-soluble poly(1-vinyl-2-pyrrolidone-co-hydroxyethylmethacrylate) reagent in the aqueous phase with liquid-phase polymer-based retention was investigated. The method was based on the retention of inorganic ions by this polymer in a membrane filtration cell and subsequent separation of low-molar-mass species from the polymer/metal-ion complex formed. Poly(1-vinyl-2-pyrrolidone-co-hydroxyethylmethacrylate) could bind metal ions such as Cr(III), Co(II), Zn(II), Ni(II), Cu(II), Cd(II), and Fe(III) in aqueous solutions at pHs 3, 5, and 7. The retention percentage for all the metal ions in the polymer was increased at pH 7, at which the maximum retention capacity could be observed. The interaction of inorganic ions with the hydrophilic polymer was determined as a function of the pH and filtration factor.

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PREPARATION, CHARACTERIZATION AND APPLICATION OF POLY(HYDROXYETHYL METHACRYLATE -co- ACRYLAMIDE) AS NON IONIC WATER-SOLUBLE POLYCHELATOGEN

Cited by 6 publications

References 0 publications

Synthesis, characterization and application of poly[(1‐vinyl‐2‐pyrrolidone)‐co‐(2‐hydroxyethyl methacrylate)] as controlled‐release polymeric system for 2,4‐dichlorophenoxyacetic chloride using an ultrafiltration technique

Synthesis, characterization and application of poly[(1‐vinyl‐2‐pyrrolidone)‐co‐(2‐hydroxyethyl methacrylate)] as controlled‐release polymeric system for 2,4‐dichlorophenoxyacetic chloride using an ultrafiltration technique

Metal ion retention using the ultrafiltration technique: Preparation, characterization of the water‐soluble poly(1‐vinyl‐2‐pyrrolidone‐co‐itaconic acid) and its metal complexes in aqueous solutions

Nonionic water‐soluble polymer: Preparation, characterization, and application of poly(1‐vinyl‐2‐pyrrolidone‐co‐hydroxyethylmethacrylate) as a polychelatogen

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