Graft and block copolymers of chitosan with vinyl monomers: Synthesis, structure, and properties

Мочалова, А. Е.; Kruglova, E. N.; Yunin, P. A.; Apryatina, K. V.; Smirnova, O. N.; Смирнова, Л. А.

doi:10.1134/s1560090415020116

Cited by 21 publications

(9 citation statements)

References 13 publications

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“…The FTIR spectra of chitosan/poly(acrylonitrile) (CS-PAN) copolymers arise from the frequencies of the C

N functional group (2241 cm −1 ) [ 58 ], while the chitosan/poly(styrene) (CS-PS) copolymers FTIR spectra shows bands corresponding to the stretching vibrations of the benzene ring (1570 cm −1 ) [ 59 ]; these findings support CS-PAN and CS-PS copolymer formation. The CS main bands were also detected in copolymer spectra, and the absorption bands at 1151–1180 cm −1 were assigned to the anti-symmetric stretching of a C–O–C bridge.…”

Section: Resultsmentioning

confidence: 99%

“…The copolymerization technique was developed and characterized by Baranov, et al [ 58 ]. Block copolymer synthesis for CS-b-PAN and CS-b-PS was performed according to published procedures [ 59 , 76 ]. The reaction medium consisted of 3% water-acetic acid polysaccharide solutions with 6% acetic acid content, ascorbic acid, and hydrogen peroxide in the ratio [C 6 H 8 O 6 ]:[H 2 O 2 ] = 1:1, [CS link]:[H 2 O 2 ] = 100 (for acrylonitrile) and 50 (for styrene), and synthetic monomer content concentration of acrylonitrile was 0.152 mol/L, styrene, 0.087 mol/L.…”

Section: Methodsmentioning

confidence: 99%

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Preparation and Characterization of Facilitated Transport Membranes Composed of Chitosan-Styrene and Chitosan-Acrylonitrile Copolymers Modified by Methylimidazolium Based Ionic Liquids for CO2 Separation from CH4 and N2

et al. 2016

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CO2 separation was found to be facilitated by transport membranes based on novel chitosan (CS)–poly(styrene) (PS) and chitosan (CS)–poly(acrylonitrile) (PAN) copolymer matrices doped with methylimidazolium based ionic liquids: [bmim][BF4], [bmim][PF6], and [bmim][Tf2N] (IL). CS plays the role of biodegradable film former and selectivity promoter. Copolymers were prepared implementing the latest achievements in radical copolymerization with chosen monomers, which enabled the achievement of outstanding mechanical strength values for the CS-based membranes (75–104 MPa for CS-PAN and 69–75 MPa for CS-PS). Ionic liquid (IL) doping affected the surface and mechanical properties of the membranes as well as the gas separation properties. The highest CO2 permeability 400 Barrers belongs to CS-b-PS/[bmim][BF4]. The highest selectivity α (CO2/N2) = 15.5 was achieved for CS-b-PAN/[bmim][BF4]. The operational temperature of the membranes is under 220 °C.

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“…The FTIR spectra of chitosan/poly(acrylonitrile) (CS-PAN) copolymers arise from the frequencies of the C

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Preparation and Characterization of Facilitated Transport Membranes Composed of Chitosan-Styrene and Chitosan-Acrylonitrile Copolymers Modified by Methylimidazolium Based Ionic Liquids for CO2 Separation from CH4 and N2

et al. 2016

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“…Among various chemical modifications of CS, graft copolymerization of vinyl monomers onto CS has been shown to be a promising method for chemical and mechanical modification to generate novel properties and functions [ 25 ]. Free radical polymerization is mostly used as a “grafting from” method to perform CS modification [ 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Stimuli-Responsive Poly(2-dimethylamino-ethylmethacrylate)-Grafted Chitosan Microcapsule for Controlled Pyraclostrobin Release

Cao

Zhao

et al. 2018

IJMS

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Controllable pesticide release in response to environmental stimuli is highly desirable for better efficacy and fewer adverse effects. Combining the merits of natural and synthetic polymers, pH and temperature dual-responsive chitosan copolymer (CS-g-PDMAEMA) was facilely prepared through free radical graft copolymerization with 2-(dimethylamino) ethyl 2-methacrylate (DMAEMA) as the vinyl monomer. An emulsion chemical cross-linking method was used to expediently fabricate pyraclostrobin microcapsules in situ entrapping the pesticide. The loading content and encapsulation efficiency were 18.79% and 64.51%, respectively. The pyraclostrobin-loaded microcapsules showed pH-and thermo responsive release. Microcapsulation can address the inherent limitation of pyraclostrobin that is photo unstable and highly toxic on aquatic organisms. Compared to free pyraclostrobin, microcapsulation could dramatically improve its photostability under ultraviolet light irradiation. Lower acute toxicity against zebra fish on the first day and gradually similar toxicity over time with that of pyraclostrobin technical concentrate were in accordance with the release profiles of pyraclostrobin microcapsules. This stimuli-responsive pesticide delivery system may find promising application potential in sustainable plant protection.

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“…In our previous work [43], it was demonstrated that CS could be efficiently modified by radical copolymerization with vinyl monomers; before this, just a few papers were published in this field [44,45]. The main advantage of this modification is that it could be applied with a wide range of monomers, resulting in a notable change in chemical, mechanical and thermal stability, solubility and other essential properties [43,46,47,48]. Radical copolymerization with styrene [47] and acrylonitrile [48] significantly increases CS mechanical properties and, more importantly, limits polysaccharide dissolution in the presence of water without fractional free volume decrease [43].…”

Section: Introductionmentioning

confidence: 99%

Novel Composite Membranes Based on Chitosan Copolymers with Polyacrylonitrile and Polystyrene: Physicochemical Properties and Application for Pervaporation Dehydration of Tetrahydrofuran

et al. 2019

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Pervaporation has been applied for tetrahydrofuran (THF) dehydration with novel composite membranes advanced by a thin selective layer composed of chitosan (CS) modified by copolymerization with vinyl monomers, acrylonitrile (AN) and styrene, in order to improve the chemical and mechanical stability of CS-based membranes. Composite membranes were developed by depositing a thin selective layer composed of CS copolymers onto a commercially-available porous support based on aromatic polysulfonamide (UPM-20®). The topography and morphology of the obtained materials were studied by atomic force microscopy (AFM), scanning electron microscopy (SEM) and X-ray diffraction analysis (XRD). Thermal properties and stability were determined by coupled evolved gas analysis (EGA-MS). Transport properties were estimated in pervaporation dehydration of THF. The effect of operating parameters for the pervaporation dehydration of THF such as feed compositions and temperatures (295, 308 and 323 K) was evaluated. It was shown that CS modification with different vinyl monomers led to a difference in physical and transport properties. The composite membrane with the thin selective layer based on CS-PAN copolymer demonstrated optimal transport properties and exhibited the highest water content in the permeate with a reasonably high permeation flux.

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Graft and block copolymers of chitosan with vinyl monomers: Synthesis, structure, and properties

Cited by 21 publications

References 13 publications

Preparation and Characterization of Facilitated Transport Membranes Composed of Chitosan-Styrene and Chitosan-Acrylonitrile Copolymers Modified by Methylimidazolium Based Ionic Liquids for CO2 Separation from CH4 and N2

Preparation and Characterization of Facilitated Transport Membranes Composed of Chitosan-Styrene and Chitosan-Acrylonitrile Copolymers Modified by Methylimidazolium Based Ionic Liquids for CO2 Separation from CH4 and N2

Synthesis and Characterization of Stimuli-Responsive Poly(2-dimethylamino-ethylmethacrylate)-Grafted Chitosan Microcapsule for Controlled Pyraclostrobin Release

Novel Composite Membranes Based on Chitosan Copolymers with Polyacrylonitrile and Polystyrene: Physicochemical Properties and Application for Pervaporation Dehydration of Tetrahydrofuran

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