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Plasma Polymers (plasma + polymer)

Distribution by Scientific Domains
Polymers and Materials Science87%

Selected Abstracts

Ceric Ammonium Nitrate Initiated Grafting of PEG to Plasma Polymers for Cell-Resistant Surfaces

PLASMA PROCESSES AND POLYMERS, Issue 2 2008
Naomi J. Vickers
Abstract The development of a facile method with general applicability and mild reaction conditions for grafting PEG onto surfaces to reduce bio-adhesion is described. The approach taken was to use CAN to graft PEG to plasma polymers coatings selected to give a high concentration of alcohol groups. The study showed that grafting required functional groups on surfaces, a minimum concentration of CAN initiator (0.05 M) and was time and initiator concentration dependent. Adhesion of fibroblasts and endothelial cells was reduced to negligible levels compared to the adhesion to tissue culture polystyrene and untreated plasma polymers of allyl alcohol following CAN induced PEG grafting. [source]

Vacuum-Ultraviolet Photopolymerisation of Amine-Rich Thin Films

MACROMOLECULAR CHEMISTRY AND PHYSICS, Issue 10 2008
Florina Truica-Marasescu
Abstract Nitrogen-rich organic thin films were deposited by VUV-assisted photochemical polymerisation of flowing C2H4/NH3 mixtures. The fundamental reaction mechanisms of these binary gas mixtures were investigated as a function of the wavelength of two almost monochromatic VUV sources. Compositions of these "UV-PE:N" films close to the surface were determined by XPS, and the amine concentrations and selectivities were quantified via chemical derivatisation. The UV-PE:N films were compared with plasma polymers deposited using low-pressure glow discharges in similar gas flow mixtures, "L-PPE:N"; it is shown that VUV photochemistry is superior to plasma chemistry in producing almost monofunctional organic thin films. [source]

Pulsed-Plasma Polymeric Allylamine Thin Films

PLASMA PROCESSES AND POLYMERS, Issue 8 2009
Zhilu Yang
Abstract High surface functional groups concentration, excellent dynamical stability and mechanical properties are ideal for biomedical plasma polymers. Herein, we report a simple and effective approach to fabricating such an ideal plasma polymeric allylamine film on 316L stainless steel (SS) by pulsed plasma polymerization. The experimental results show that the concentration of the primary amine groups (NH2/C) of the plasma polymeric allylamine film was 2.4,±,0.4%. The plasma polymeric allylamine film possesses not only high surface NH2 concentration, but also high cross-linking degree and close-knit network structure that could well resist hydrolysis, and dissolution in the aqueous solution. Furthermore, the plasma polymeric allylamine film was used as a stent coating that shows a good resistance to the deformation behaviour of compression and expansion of the stent. [source]

Protein Immobilization Using Atmospheric-Pressure Dielectric-Barrier Discharges: A Route to a Straightforward Manufacture of Bioactive Films

PLASMA PROCESSES AND POLYMERS, Issue 2 2008
Pieter Heyse
Abstract An alternative single-step method for biomolecule entrapment in atmospheric plasma polymers is described. Relying on our experience to fabricate organic coatings at mild plasma conditions, fluorescent proteins and an organic coating precursor were simultaneously introduced to the DBD. Fluorescence microscopy and spectrum analysis unambiguously illustrate the single-step protein immobilization procedure using DBD. Moreover, in contrast to covalent immobilization procedures, the developed technique showed a homogeneous protein distribution in the coating. [source]

Ceric Ammonium Nitrate Initiated Grafting of PEG to Plasma Polymers for Cell-Resistant Surfaces

PLASMA PROCESSES AND POLYMERS, Issue 2 2008
Naomi J. Vickers
Abstract The development of a facile method with general applicability and mild reaction conditions for grafting PEG onto surfaces to reduce bio-adhesion is described. The approach taken was to use CAN to graft PEG to plasma polymers coatings selected to give a high concentration of alcohol groups. The study showed that grafting required functional groups on surfaces, a minimum concentration of CAN initiator (0.05 M) and was time and initiator concentration dependent. Adhesion of fibroblasts and endothelial cells was reduced to negligible levels compared to the adhesion to tissue culture polystyrene and untreated plasma polymers of allyl alcohol following CAN induced PEG grafting. [source]

Cover Picture: Plasma Process.

PLASMA PROCESSES AND POLYMERS, Issue 3 2006
Polym.
Cover: Plasma polymerized films undergo ageing processes when they are exposed to ambient air. The surface of a really fresh film can be studied when the reactor is online with analytical instruments, such as X-ray photoelectron or absorption spectrometers as well as Time-of-Flight SIMS. Allyl amine plasma polymers deposited at varied plasma parameters were thoroughly investigated using this approach. Further details can be found in the Full Paper by U. Oran,* S. Swaraj, A. Lippitz, and W. E. S. Unger on page 288. [source]

Cover Picture: Plasma Process.

PLASMA PROCESSES AND POLYMERS, Issue 8 2005
Polym.
Cover: The Figure shows the X-ray photoelectron spectra of the nitrogen 1s core levels and the near edge X-ray fine structure nitrogen K edge of plasma polymers and plasma co-polymers prepared from allylamine and mixtures of acrylic acid and allylamine. Molecular models of allylamine, acrylic acid and allylammonium acrylate salt are shown to illustrate the chemistry. This is shown on a background of a micrograph of melanocytes cultured on a plasma polymer coating. The micrograph has been artificially colourised. Further details can be found in the Full Paper by A. J. Beck,* J. D. Whittle, N. A. Bullett, P. Eves, S. Mac Neil, S. L. McArthur, and A. G. Shard on page 641. [source]

The investigation of protein adsorption behaviors on different functionalized polymers films

BIOTECHNOLOGY JOURNAL, Issue 6 2007
Zhi-Hong Zhang Dr.
Abstract The adsorption of BSA and fibrinogen onto plasma-polymerized di-(ethylene glycol) vinyl ether, allylamine, and maleic anhydride films were investigated in detail by surface plasmon resonance spectroscopy (SPR). The chemical properties of the plasma polymers were initially determined by the plasma deposition conditions during the generation procedure. The analysis of the chemical structure of the films and the refractive index of plasma polymers in aqueous solution was carried out using Fourier transform infrared spectroscopy and waveguide mode spectroscopy, respectively. Using water contact angle measurement, the surface wettability of plasma polymers was also characterized. These properties have a critical influence on the behavior of protein adsorption on the surface of the plasma polymers. Protein adsorption was found to depend not only on the types of functionalized groups, but also on the plasma polymer thickness since the protein molecules penetrate into the plasma polymer network bulk. According to the size of protein molecules in aqueous solution and the amount of adsorbed proteins observed by SPR, the conformational changes of proteins could be deduced. [source]