Structure of polyethylene after pulse ion beam treatment

Гаврилов, Н. М.; Yakusheva, D. E.; Kondyurin, Alexey

doi:10.1002/(sici)1097-4628(19980808)69:6<1071::aid-app3>3.3.co;2-g

Cited by 3 publications

(3 citation statements)

References 3 publications

(3 reference statements)

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“…The proposed mechanisms of protein attachment that have been proposed for binding to modified polymers are in contradiction with each other and do not explain observations. For example, an appearance of oxygen containing groups in polymer surface after radiation damage causes an increase in surface energy, especially its polar part [10,[36][37][38][43][44][45][46][47][48]. If the mechanism is of protein binding is assumed to be via physical adsorption, protein attachment should be stronger on non-polar surfaces [49,50].…”

Section: Introductionmentioning

confidence: 99%

Mechanisms for Covalent Immobilization of Horseradish Peroxidase on Ion-Beam-Treated Polyethylene

et al. 2012

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The surface of polyethylene was modified by plasma immersion ion implantation. Structure changes including carbonization and oxidation were observed. High surface energy of the modified polyethylene was attributed to the presence of free radicals on the surface. The surface energy decay with storage time after treatment was explained by a decay of the free radical concentration while the concentration of oxygen-containing groups increased with storage time. Horseradish peroxidase was covalently attached onto the modified surface by the reaction with free radicals. Appropriate blocking agents can block this reaction. All aminoacid residues can take part in the covalent attachment process, providing a universal mechanism of attachment for all proteins. The native conformation of attached protein is retained due to hydrophilic interactions in the interface region. The enzymatic activity of covalently attached protein remained high. The long-term activity of the modified layer to attach protein is explained by stabilisation of unpaired electrons in sp2 carbon structures. A high concentration of free radicals can give multiple covalent bonds to the protein molecule and destroy the native conformation and with it the catalytic activity. The universal mechanism of protein attachment to free radicals could be extended to various methods of radiation damage of polymers.

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Section: Introductionmentioning

confidence: 99%

Mechanisms for Covalent Immobilization of Horseradish Peroxidase on Ion-Beam-Treated Polyethylene

et al. 2012

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“…It is now well established that the glow discharge treatment creates physical and chemical changes such as cross-linking, degradation, formation of free radicals, and oxygen functionalization. [2,9,12,16,19] The temperature of gases in a glow discharge generally remains low and the plasma plays a predominant role in the surface modification of polymers. It is possible to strike glow discharge with either a DC or RF power source.…”

Section: Introductionmentioning

confidence: 99%

Effect of surface modification of high-density polyethylene by direct current and radio frequency glow discharge on wetting and adhesion characteristics

Bhowmik

Chaki

Ray

et al. 2004

Metall Mater Trans A

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The present investigation aims to optimize the process parameters of Direct Current (DC) and Radio Frequency (RF) glow discharge treatment through air in terms of discharge power and time of exposure for the surface modification of high-density polyethylene (HDPE) sheet, for attaining best adhesive joint of the polymer to mild steel. In order to estimate the extent of surface modification, the surface energies of the polymer surfaces exposed to glow discharge have been determined by measuring contact angles using two standard test liquids of known surface energies. It is observed that at a given power level of DC glow discharge, surface energy and its polar component increase with increasing exposure time, attaining a maximum and then decreasing. In the case of RF glow discharge, surface energy and its polar component increase with increasing exposure time and then saturate. Surface modification by DC glow discharge increases the surface energy of HDPE relatively more at a lower power compared to that observed for RF glow discharge. The dispersion component of surface energy remains almost unaffected. The surfaces have also been studied by electron spectroscopy for chemical analysis (ESCA) and energy-dispersive spectra (EDS). A significant oxygen peak is observed for surface-modified polymer as detected by ESCA and EDS. Lap shear tensile test of an adhesive (Araldite AY 105) joint of HDPE with mild steel has been carried out in optimizing the parameters of DC and RF glow discharge for maximum joint strength. When HDPE is exposed to DC glow discharge, improvement of adhesive joint strength of HDPE to mild steel is found to be by a factor more than 7. On the other hand, when HDPE is exposed to RF glow discharge, results in improvement of adhesive joint strength of HDPE to mild steel by a factor nearer to 7 are found. Thus, DC glow discharge is more capable for increasing wetting and adhesion characteristics of the polymer.

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“…[1][2][3] As a matter of fact, there are no quantitative data that give us the ability to judge the influence of the deformation on the structure of the surface layer of polymer films. 4 For this reason, in our work, we attempted to determine the parameters of the macromolecule's degree of order (S) of the whole volume and of the surface layer of uniaxially orientated polytetrafluorinethylene (PTFE) films and, on this basis, to determine the character of dependence l SL (L), where l SL is the effective thickness of the surface layer and L is the film stretching degree.…”

Section: Introductionmentioning

confidence: 99%

Molecular orientation in the surface layer of polytetrafluorinethylene

Aleinik

Saydov

2001

J of Applied Polymer Sci

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Attenuated total reflectance spectroscopy was used to study the orientation and deformation of molecular chains in polymers. Reflection and transmission spectra of the polytetrafluorinethylene (PTFE) films were obtained. Parameters of the macromolecule's degree of order were determined for the whole volume and for the surface layer of uniaxially orientated PTFE, and on this basis, we determined the character of dependence l SL (L), where l SL is the effective thickness of the surface layer and L is the film stretching degree.

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Structure of polyethylene after pulse ion beam treatment

Cited by 3 publications

References 3 publications

Mechanisms for Covalent Immobilization of Horseradish Peroxidase on Ion-Beam-Treated Polyethylene

Mechanisms for Covalent Immobilization of Horseradish Peroxidase on Ion-Beam-Treated Polyethylene

Effect of surface modification of high-density polyethylene by direct current and radio frequency glow discharge on wetting and adhesion characteristics

Molecular orientation in the surface layer of polytetrafluorinethylene

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