Detection of Negative Molecular Ions in Acrylic Acid Plasma:  Some Implications for Polymerization Mechanisms

Swindells, Ian; Voronin, Sergey A.; Fotea, Catalin; Alexander, Morgan R.; Bradley, James W.

doi:10.1021/jp074258o

Cited by 20 publications

(26 citation statements)

References 15 publications

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“…Over the last 30 years many techniques have been developed and used to modify the surfaces of many different polymers. Corona discharge, plasma treatment, plasma polymerization, grafting copolymerization and UV/treatment with ozone have all achieved successful results. Contrary to other methodologies, UV‐assisted treatment is mainly based on photo‐induced chemical processes, where special photoreactive moieties (which can be either side groups or part of the main chain of the macromolecule) have a distinct, selective and efficient reactivity.…”

Section: Introductionmentioning

confidence: 99%

Controlling the surface wettability of poly(sulfone) films by UV‐assisted treatment: benefits in relation to plasma treatment

Kessler¹,

Kühn²,

Radtke³

et al. 2012

Polymer International

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Hydrophilic and superhydrophilic surfaces of poly(sulfone) (PSU) thin films were prepared by UV irradiation in the presence of O2 or acrylic acid (AA) vapor. Treated surfaces were then investigated by water contact angle measurements, Fourier transformed IR spectroscopy in attenuated total reflectance mode (FTIR‐ATR), X‐ray photoelectron spectroscopy (XPS), near‐edge X‐ray absorption fine structure (NEXAFS) and AFM. Water contact angle values of treated PSU films using either O2 or AA vapor as the reactive atmosphere reached about 6° after more than 120 min of irradiation. FTIR‐ATR, XPS and NEXAFS analysis showed incorporation of oxygenated groups onto the surface that led to its hydrophilic characteristics. In addition, when AA vapor was used as the reactive atmosphere, a photopolymerization process of poly(acrylic acid) onto the surface of the PSU was observed. AFM analysis showed a very low level of roughness after the treatments. A comparison of UV‐assisted surface modifications of PSU films with traditional plasma treatments showed excellent qualitative agreement between the two techniques. Our results show that UV‐assisted treatments in the presence of AA vapor or O2 are efficient ways of controlling the surface wettability and functionalities grafted on the surface of PSU films. This treatment can be considered as a permanent dry grafting method that resists aging and uses a simple experimental setup. © 2012 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Controlling the surface wettability of poly(sulfone) films by UV‐assisted treatment: benefits in relation to plasma treatment

Kessler¹,

Kühn²,

Radtke³

et al. 2012

Polymer International

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“…In this manuscript we expand upon this preliminary report and present a more comprehensive investigation of the deposition rate and chemical composition of nitrogen (amine)‐ and oxygen (carboxyl)‐containing monomers on metal (gold) and organic (MUA) surfaces. Amine‐ and carboxyl‐containing monomers were selected for two reasons: Firstly, these monomers are precursors for creating coatings of controlled functional group density, which have been employed in a wide range of applications;15, 33, 35, 36, 41–43 secondly, there is a significant body of work describing aspects of the polymerization of these monomers,44–53 by reference to which we are able to formulate a working hypothesis that helps in understanding the substrate differences we report.…”

Section: Introductionmentioning

confidence: 99%

Early Stages of Growth of Plasma Polymer Coatings Deposited from Nitrogen‐ and Oxygen‐Containing Monomers

Vasilev

Michelmore

Martinek

et al. 2010

Plasma Processes & Polymers

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Ultrathin functional coatings deposited by plasma polymerization have utility in nano‐ and microtechnologies, however, until now very little has been reported to validate the widely held view that these coatings can be deposited onto any type of substrate, without substrate influence. In order to ascertain the role of the substrate in the early stages of plasma growth we address the growth rate and chemistry of plasma polymer coatings from two nitrogen‐ and two oxygen‐containing monomers during the first stages of deposition onto gold and onto thiol MUA‐coated gold surfaces. SPR thickness measurements and XPS analyzes indicate the substrate must be taken into account when ultrathin plasma polymer coatings are used for surface modification and we speculate on why this should be so.

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“…Traces of the reactions of such a type with elimination of H 2 O or C 2 H 2 at the plasma polymerization of acrylic acid were detected by means of a negative ions mass spectrometry 22. Plasma polymerization is quite another phenomenon than the classical chemical polymerization.…”

Section: Discussionmentioning

confidence: 99%

Pre‐polymerization Kinetics in Continuous and Pulsed Glow Discharge in Tetrafluoroethylene

Андреева

Kutsarev

Shatsky

et al. 2012

Plasma Processes & Polymers

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Kinetic pictures, i.e., full sets of all available kinetic curves, were obtained with the help of continuous mass spectrometry and analyzed with the purpose of studying some aspects of the mechanism of initial stages of molecular growth in a batch reactor. The kinetic curves were clearly parted into three types—initial, intermediate, and final. All of the new substances are evolving simultaneously and in parallel, independently of their molecular mass, from C2 to C18, what evidences that the fast stepwise or chain reactions of chemical synthesis are preceded by the slow limiting stage of the discharge activation. The method of momentary characteristics is demonstrated which allows to perform a quantitative analysis of the kinetic material even in the difficult cases of batch and modulated systems.

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Detection of Negative Molecular Ions in Acrylic Acid Plasma: Some Implications for Polymerization Mechanisms

Cited by 20 publications

References 15 publications

Controlling the surface wettability of poly(sulfone) films by UV‐assisted treatment: benefits in relation to plasma treatment

Controlling the surface wettability of poly(sulfone) films by UV‐assisted treatment: benefits in relation to plasma treatment

Early Stages of Growth of Plasma Polymer Coatings Deposited from Nitrogen‐ and Oxygen‐Containing Monomers

Pre‐polymerization Kinetics in Continuous and Pulsed Glow Discharge in Tetrafluoroethylene

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