Plasma grafting — a method to obtain monofunctional surfaces

Oehr, Christian; Müller, Michaela; Elkin, Bentsian; Hegemann, Dirk; Vohrer, U.

doi:10.1016/s0257-8972(99)00201-7

Cited by 127 publications

(88 citation statements)

References 10 publications

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“…The plasma radiation creates free radicals on the surface of the material, which sometimes is then allowed to react with oxygen in order to form peroxides [17]. These peroxides are exchanged in solution with the chosen grafting material, often molecules containing carboxyl, hydroxyl, or amine groups.…”

Section: -4-2 Plasma Graftingmentioning

confidence: 99%

Surface modification of microporous polypropylene membrane by UV-initiated grafting with poly(ethylene glycol) diacrylate

Chan

Obendorf

2014

Fibers Polym

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In this study, poly(ethylene glycol) diacrylate (PEGDA) was surface grafted, through UV-initiated grafting, on to a microporous polypropylene (PP) membrane in order to develop and control a moisture-sensitive porous structure. Based on the concentration of the PEGDA grafting solution, as well as other variables, the pores of the membrane were filled to varying degrees with cross-linked PEGDA hydrogel, decreasing the pore sizes. This decrease in pore size was highly dependent on the grafting degree, or weight add-on of the grafted polymer. The grafting degree can be controlled by altering various grafting conditions. The surface grafted PEGDA is expected to swell significantly when exposed to moisture, through change in relative humidity or a liquid-borne pathogen, causing the pore sizes to decrease even further.This provides a microporous polypropylene membrane with improved hydrophilicity and moisture-responsive pores. The membranes will have varying levels of breathability based on the amount of moisture exposure. This will allow for a functional membrane that limits the transport of liquid-borne pathogens while providing transport of moisture vapor away from the body.iii BIOGRAPHICAL SKETCH Mark Chan was born in sunny California during the Chinese year of the Dragon, 1988. After a long and successful career from pre-school through high school,

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Section: -4-2 Plasma Graftingmentioning

confidence: 99%

Surface modification of microporous polypropylene membrane by UV-initiated grafting with poly(ethylene glycol) diacrylate

Chan

Obendorf

2014

Fibers Polym

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“…The aqueous solubility of PEO makes it less appropriate for many biomaterials applications. In order to retain the monomer structure within the plasma deposited films and consequently its functionality, many different issues have been addressed in recent literature as for instance the film deposition under low mean RF power level by controlling the power supply on/off ratio [12,13], the decreasing of monomer residence time and consequently the reduction of its interaction with the plasma environment [14], the cooling of substratum with liquid nitrogen [15], the energy reduction of the ions reaching the substratum [16], and so on. In order to set the appropriate experimental parameters that would result customized film structures in plasma polymerization of PEO-like coatings this paper deals with the study of the RF power dependence of different ionized chemical species resulting from diglyme fragmentation for different values of the pressure inside the plasma reactor.…”

Section: Introductionmentioning

confidence: 99%

Study of RF-excited Diethylene Glycol Dimethyl Ether Plasmas by Mass Spectrometry

Algatti

Mota

Moreira

et al. 2012

J. Phys.: Conf. Ser.

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Wettability, optical properties and molecular structure of plasma polymerized diethylene glycol dimethyl ether T C A M Azevedo, M A Algatti, R P Mota et al. -Degradation of m-cresol in aqueous solution by dielectric barrier discharge B Jaramillo-Sierra, A Mercado-Cabrera, R López-Callejas et al. Abstract. This paper deals with the study of the fragmentation process of diethylene glycol dimethyl ether (CH3O(CH2CH2O)2CH3) (diglyme here in) molecule in low pressure RF excited plasma discharges. The study was carried out using mass spectrometry. The results showed that for a fixed pressure, the increase of the RF power coupled to the plasma chamber from 1 to 35 W produced a plasma environment much more reactive which increases the population of the ionized species like CH + (75 amu). This fact may be attributed to the increase of the electronic temperature that makes predominant the occurrence of inelastic processes that promotes molecular fragmentation. For a fixed value of RF power the increase of pressure from 50 mTorr to 100 mTorr produces the decreasing of the above mentioned chemical species due the lower electronic mean free path. These results suggest that if one wants to keep the monomer's functionality within the plasma deposited films resulting from such kind of discharges one must operate in low power conditions.

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“…However, many of the chemical modification methods often fall short of providing efficient transformations because the reagents used do not yield specific functionalities or the highly oxidative reactions involved in some treatments are difficult to control. [1][2][3][4][5][6][7] Physical methods on the other hand, such as polymer adsorption [8][9][10][11][12][13] or the formation of self-assembled monolayers (SAMs) [14][15][16] have shown great promise for the quantitative control of the surface composition and functionality of materials substrates. However, they might not be as robust due to physisorption instead of chemisorption.…”

Section: Introductionmentioning

confidence: 99%

“…15), a significant change in the disorder band was observed. Its intensity increased dramatically relative to both the radial breathing and the tangential modes, indicating that a large number of sp 2 hybridized carbons have been converted to sp 3 hybridization. The intensity of the tangential mode relative to the radial breathing mode also increased.…”

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confidence: 99%

Orthogonal Transformations on Solid Substrates: Efficient Avenues to Surface Modification

2009

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The performance of solid substrates is not only governed by their molecular constitution, but is also critically influenced by their surface constitution at the solid/gas or solid/liquid interface. In here, we critically review the use of orthogonal chemical transformations (so‐called click chemistry) to achieve efficient surface modifications of materials ranging from gold and silica nanoparticles, polymeric films, and microspheres to fullerenes as well as carbon nanotubes. In addition, the functionalization of surfaces via click chemistry with biomolecules is explored. Although a large host of reactions fulfilling the click‐criteria exist, pericyclic reactions are most frequently employed for efficient surface modifications. The advent of the click chemistry concept has led—as evident from the current literature—to a paradigm shift in current approaches for materials modification: Away from unspecific and nonselective reactions to highly specific true surface engineering.

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Plasma grafting — a method to obtain monofunctional surfaces

Cited by 127 publications

References 10 publications

Surface modification of microporous polypropylene membrane by UV-initiated grafting with poly(ethylene glycol) diacrylate

Surface modification of microporous polypropylene membrane by UV-initiated grafting with poly(ethylene glycol) diacrylate

Study of RF-excited Diethylene Glycol Dimethyl Ether Plasmas by Mass Spectrometry

Orthogonal Transformations on Solid Substrates: Efficient Avenues to Surface Modification

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