Degradation of polymers in reactive gases

Разумовский, С. Д.; Kefeli, A.A.; Zaikov, G.Ye.

doi:10.1016/0014-3057(71)90111-x

Cited by 47 publications

(22 citation statements)

References 3 publications

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“…(Hydro)peroxides also react with ozone to convert-back to peroxy-radicals. Therefore with long ozonation times, the (hydro)peroxide concentration becomes constant and the other functionalities increase in concentration [26]. As expected, the peroxide concentration produced on the PCL films increased with the ozonation time and stabilized at a plateau for ozonation times longer than 60 minutes.…”

Section: Discussionmentioning

confidence: 76%

The grafting of a thin layer of poly(sodium styrene sulfonate) onto poly(ε-caprolactone) surface can enhance fibroblast behavior

Rohman

Huot

Vilas-Boas

et al. 2015

J Mater Sci: Mater Med

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Poly(sodium styrene sulfonate) (pNaSS) was grafted onto poly(ε-caprolatone) (PCL) surfaces via ozonation and graft polymerization. The effect of ozonation and polymerization time, as well as the Mohr’s salt concentration in the grafting solution, on the degree of grafting was investigated. The degree of grafting was determined through toluidine blue staining. The surface chemical change was characterized by attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), energy-dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS). The result demonstrated that the grafting did not induce any degradation of PCL, and that pNaSS was grafted onto PCL as a thin and covalently stable layer. Furthermore, the modified PCL surface reveals a significant increase in the metabolic activity of fibroblastic cells, as well as a better cell spreading with higher adhesion strength. Consequently, bioactivity of PCL is greatly enhanced by immobilizing a thin layer of pNaSS onto its surface. The grafting of pNaSS is a promising approach to increase the bioactivity of PCL-based materials used in tissue engineering applications, such as ligament reconstruction.

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Section: Discussionmentioning

confidence: 76%

The grafting of a thin layer of poly(sodium styrene sulfonate) onto poly(ε-caprolactone) surface can enhance fibroblast behavior

Rohman

Huot

Vilas-Boas

et al. 2015

J Mater Sci: Mater Med

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“…This peak may correspond to aliphatic aldehydes, carboxylic acids and aliphatic ketones 19, 23. As reported by Razumovskii and coworkers,24 when saturated hydrocarbon chains such as PE react with ozone, peroxy‐radicals will form first, then the peroxy‐radicals convert to peroxides, ketones, aldehydes, acids, etc. The peroxides were generated in ratio with carbonyl and carboxyl groups.…”

Section: Resultsmentioning

confidence: 81%

“…simultaneously. At the same time, the peroxides formed also react with ozone to convert back to peroxy‐radicals 6, 23, 24. When reaction proceeds, peroxide concentration increases, correspondingly, the rate of backward reaction, i.e., peroxides convert back to peroxy‐radicals increases.…”

Section: Resultsmentioning

confidence: 99%

An investigation into surface modification of polyethylene films for hydrophilicity enhancement by catalytic ozonation

Mastan

Doan

2012

J of Applied Polymer Sci

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For a conventional polyethylene film, ozonation was conducted to increase its surface hydrophilicity. Copper sulfate was found effective as a catalyst in aqueous ozonation to increase the generation of surface peroxides significantly, which is the essential step for hydrophilicity enhancement. The percentage increase in peroxide generation could range from 41% to 58% by aqueous catalytic ozonation over its noncatalyzed gaseous counterpart. The optimum concentration of copper sulfate was found to be 0.05 g/L. After adding the catalyst, the length of ozonation could be significantly reduced so that the bulk mechanical strength of the films, represented by tensile strength, could be well preserved after ozonation. A novel kinetic model for the aqueous ozonation was proposed. This model was developed by combing the reaction mechanism of gaseous ozonation of polyethylene films with that of ozone self-decomposition in water. The peroxide generation also increased with the applied ozone dose. The surface morphology and contact angle of the film were all examined before and after ozonation.

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“…It has been reported that prolonged exposure of PE films to ozone results in peroxy‐radicals as shown in Scheme . The peroxy‐radicals further undergo rearrangement possibly resulting in aldehydes, ketones, and acids etc.…”

Section: Resultsmentioning

confidence: 99%

Antibacterial Membranes for Water Remediation with Controlled Leaching of Biocidal Silver Aided by Prior Grafting of Poly(ethylene imine) on to Ozone‐Treated Polyethylene

et al. 2017

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We describe a novel strategy to control the release of silver from polyethylene‐based water purification membranes by suitably modifying the membrane surface by a biocidal macromolecule (poly(ethylene imine), PEI) before depositing silver on the surface. The PE membranes were first treated with ozone and then PEI was covalently grafted. The distribution of silver was mapped by EDAX, and the antibacterial activity assessed by standard plate count method and by estimating the reactive oxygen species. The new membrane allows controlled release of silver ions which otherwise would contaminate the water source if used in excess. Leaching in the final permeate is lower than 0.03 ppm opening the route to antibacterial polyolefin‐based membranes for water decontamination.

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Degradation of polymers in reactive gases

Cited by 47 publications

References 3 publications

The grafting of a thin layer of poly(sodium styrene sulfonate) onto poly(ε-caprolactone) surface can enhance fibroblast behavior

The grafting of a thin layer of poly(sodium styrene sulfonate) onto poly(ε-caprolactone) surface can enhance fibroblast behavior

An investigation into surface modification of polyethylene films for hydrophilicity enhancement by catalytic ozonation

Antibacterial Membranes for Water Remediation with Controlled Leaching of Biocidal Silver Aided by Prior Grafting of Poly(ethylene imine) on to Ozone‐Treated Polyethylene

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