Synthesis of narrow molecular weight distribution polyvinyl acetate by gamma–rays initiated RAFT/MADIX miniemulsion polymerization

Segura, Tania; Menes‐Arzate, Martha; León, Fernando Gordillo; Ortega, Alejandra; Burillo, Guillermina; Peralta, René D.

doi:10.1016/j.polymer.2016.09.004

Cited by 14 publications

(8 citation statements)

References 48 publications

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“…Thermal initiators such as, azobisisobutyronitrile, benzoyl peroxide as well as Fenton reagent, and the gamma radiation or microwave are known sources for polymerization reaction initiation. Moreover, PVAC can be used for synthesis of some copolymers and, also, as precursor for the poly(vinyl alcohol) synthesis by hydrolysis . The application of PVAC as corrosion inhibitor for mild steel in sulfuric acid solution and for aluminum in sulfuric acid and hydrochloric acid (HCl) media was reported.…”

Section: Introductionmentioning

confidence: 99%

“…The vinyl acetate (VAc) can polymerize by radical mechanism, in alcoholic solution as well as in heterogeneous environments such as, emulsion, miniemulsion or microemulsion, and suspension . Thermal initiators such as, azobisisobutyronitrile, benzoyl peroxide as well as Fenton reagent, and the gamma radiation or microwave are known sources for polymerization reaction initiation. Moreover, PVAC can be used for synthesis of some copolymers and, also, as precursor for the poly(vinyl alcohol) synthesis by hydrolysis .…”

Section: Introductionmentioning

confidence: 99%

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Anticorrosive coating based on poly(vinyl acetate) formed by electropolymerization on the copper surface

Samide

Brãtulescu

Merişanu

et al. 2018

J of Applied Polymer Sci

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The poly(vinyl acetate) (PVAC) film was obtained by electropolymerization on the copper electrode using cyclic voltammetry performed in mixed electrolyte based on water/ethyl alcohol/acetic acid containing vinyl acetate (VAc) and benzoyl peroxide as polymerization initiator. The coatings were characterized by optical microscopy, scanning electron microscopy (SEM) and infrared (IR) spectroscopy. The corrosion was induced in hydrochloric acid solution using potentiodynamic measurements and electrochemical impedance spectroscopy (EIS). The microscopic and SEM images revealed the PVAC coating formation and IR spectroscopy confirmed that it exhibits the same characteristic bands as a standard PVAC sample. From the potentiodynamic polarization, the PVAC protective performance of 78% was computed. The EIS measurements showed the occurrence of the surface adsorbed layer with a higher impedance response to the frequency and a phase angle maximum shifted to lower values than those of uncoated samples. In addition, the VAc electropolymerization mechanism was discussed and the PVAC adsorption mechanism on the copper surface was proposed. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47320.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anticorrosive coating based on poly(vinyl acetate) formed by electropolymerization on the copper surface

Samide

Brãtulescu

Merişanu

et al. 2018

J of Applied Polymer Sci

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“…RAFT polymerization is a dynamic equilibrium between active radicals (propagating radicals) and dormant radicals via the reversible addition-fragmentation of the thiocarbonylthio groups. The initial radicals can be created from thermal decomposition of organic peroxides and azo compounds [ 5 ], reduction of hydrogen peroxide [ 6 ], thermal treatment [ 7 ], photolysis by UV or visible light [ 8 ], and ionizing irradiation [ 9 , 10 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of RAFT Agent on the Chloromethylstyrene Polymerizations in a Simultaneous Radiation Grafting System

Chen

Seko

2017

Polymers

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Reversible addition-fragmentation chain transfer (RAFT) agent was added into a simultaneous radiation grafting system and its effects on graft polymerization and homopolymerization were investigated. Chloromethylstyrene (CMS) was graft polymerized onto ethylene-tetrafluoroethylene copolymer (ETFE) films under γ-ray sources via simultaneous irradiation. The non-grafted poly(CMS) in the grafted films were extracted by xylene at 120 • C. The poly(CMS) was characterized by NMR and GPC instruments. Addition of the RAFT agent suppressed both graft polymerization and homopolymerization. However, under a high concentration of RAFT agent, the homopolymerization in the monomer solution could occur through a typical RAFT polymerization while polymerization in the ETFE films proceeded via RAFT and conventional radical polymerization, resulting in poly(CMS) in the ETFE films with molecular weight dispersity higher than 1.0 but lower than that without RAFT agent. Furthermore, it was found that the molecular weight of the poly(CMS) in the ETFE films was several times higher than that of the poly(CMS) in the monomer solution.

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“…First, ELT and PVP are irradiated in the presence of water, under air conditions. Subsequently, the reacting mechanism could occur as follows: a) first, the irradiation step implies the formation of primary radicals; b) second, the initiation step provides the graft chain radicals; and finally, c) termination reactions are performed to yield the ELT-PVP hydrogel (31). The irradiation step includes the radiolysis of water (see compounds 2−8) (32), while different radicals of ELT (compounds 10−23) and PVP (compound 24) are formed (initiation step).…”

Section: Elt and Pvp Cross-linking Reaction Mechanismmentioning

confidence: 99%

Radiation-induced graft polymerization of elastin onto polyvinylpyrrolidone as a possible wound dressing

Prado-Audelo

Gómez-Zaldivar

Pérez-Díaz

et al. 2021

Cell Mol Biol (Noisy-le-grand)

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The purpose of our study was to obtain new wound dressings in the form of hydrogels that promote wound healing taking advantage of the broad activities of elastin (ELT) in physiological processes. The hydrogel of ELT and polyvinylpyrrolidone (PVP; ELT-PVP) was obtained by cross-linking induced by gamma irradiation at a dose of 25 kGy. The physicochemical changes attributed to cross-linking were analyzed through scanning electron microscopy (SEM), infrared spectroscopy analysis with Fourier transform (FTIR), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). Furthermore, we performed a rheological study to determine the possible changes in the fluidic macroscopic properties produced by the cross-linking method. Finally, we accomplished viability and proliferation analyses of human dermal fibroblasts in the presence of the hydrogel to evaluate its biological characteristics. The hydrogel exhibited a porous morphology, showing interconnected porous with an average pore size of 16 ± 8.42 µm. The analysis of FTIR, DSC, and TGA revealed changes in the chemical structure of the ELT-PVP hydrogel after the irradiation process. Also, the hydrogel exhibited a rheological behavior of a pseudoplastic and thixotropic fluid. The hydrogel was biocompatible, demonstrating high cell viability, whereas ELT presented low biocompatibility at high concentrations. In summary, the hydrogel obtained by gamma irradiation revealed the appropriate morphology to be applied as a wound dressing. Interestingly, the hydrogel exhibited a higher percentage of cell viability compared with ELT, suggesting that the cross-linking of ELT with PVP is a suitable strategy for biological applications of ELT without generating cellular damage.

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Synthesis of narrow molecular weight distribution polyvinyl acetate by gamma–rays initiated RAFT/MADIX miniemulsion polymerization

Cited by 14 publications

References 48 publications

Anticorrosive coating based on poly(vinyl acetate) formed by electropolymerization on the copper surface

Anticorrosive coating based on poly(vinyl acetate) formed by electropolymerization on the copper surface

Effects of RAFT Agent on the Chloromethylstyrene Polymerizations in a Simultaneous Radiation Grafting System

Radiation-induced graft polymerization of elastin onto polyvinylpyrrolidone as a possible wound dressing

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