Filtern
Dokumenttyp
- Zeitschriftenartikel (7)
- Vortrag (7)
- Beitrag zu einem Tagungsband (6)
- Beitrag zu einem Sammelband (4)
- Sonstiges (3)
Schlagworte
- XPS (3)
- Plasma polymer (2)
- Pulsed plasma polymerization (2)
- r.f. pulsed plasma (2)
- Acethylene (1)
- Adhesion promoting interlayers (1)
- Butadiene (1)
- Charcterization of homo- and copolymers (1)
- Chemical characterization (1)
- Chemical conversion of functional groups (1)
- Conducting films (1)
- Copolymers (1)
- DLC (1)
- Deposition process (1)
- Depth profiling (1)
- Derivatisation (1)
- Doping with metal atoms (1)
- Encapsulation of nanoparticles (1)
- Ethylene (1)
- FTIR (1)
- Functional groups (1)
- Long-term stability (1)
- Metal-polymer interface (1)
- Metal-polymer systems (1)
- NEXAFS (1)
- Oberflächenanalytik (1)
- Plasma (1)
- Plasma modification (1)
- Plasma polymerization (1)
- Plasma polymers (1)
- Plasma polymers with functional groups (1)
- Plasma-initiated copolymerization (1)
- Plasmapolymerisation (1)
- Poly(acetylene) (1)
- Polyethylene (1)
- Polymer (1)
- Polymer-metal composites (1)
- Polypropylene (1)
- Pulsed plasma (1)
- SIMS (1)
- Spacers (1)
- Stability (1)
- Styrene (1)
- Synchrotron Radiation (1)
- Synchrotron XPS (1)
- TOF-SIMS (1)
- XAS (1)
Eingeladener Vortrag
- nein (7)
Non-destructive chemical depth-profiling of plasma polymers by variable excitation energy XPS
(2003)
Organic thin films with defined chemical structures and physical properties are required for various applications. Plasma polymerization is of technological interest, since the deposition of plasma polymers is possible on any material of any shape in the desired thickness. We report on the TOF-SIMS (TOF: time-of-flight) and XPS investigations of pulse plasma poly(acetylene) and alkali metal doped pulse plasma poly(acetylene) films. The combination of TOF-SIMS and XPS supplies detailed information on the surface chemistry of these films. Application of both methods provides the possibility for cross-checking certain results. Moreover the different sensitivities of the methods can be utilized. According to the TOF-SIMS and XPS data it can be concluded that the interaction of alkali metals with plasma poly(acetylene) results in electrovalent bonds of the type Me?+C?- between carbon and metal. Furthermore carbonoxygenmetal interactions were observed. These interactions are of the type C=O?-cdots, three dots, centeredMe?+ and/or CO?-Me?+.
This new functionalization method consists of the deposition of very thin plasma polymer layers (20 to 100 nm) of functional group bearing monomers in pulsed plasma. With allylalcohol, a maximum of 30 OH groups per 100 C atoms was measured with a selectivity of about 90% and a significant stability at long-time exposure to air. Allylamine was used to produce primary amino groups, with a maximum of 18 NH2 groups per 100 C atoms. Side reactions were observed during the storage in air, such as oxidation of the amino groups. Carboxylic groups could be produced using acrylic acid with a maximum concentration of 24 COOH groups per 100 C atoms. The most prominent side reaction was the decarbonylation/ decarboxylation of the acid group during plasma deposition.___TAGSTART___BR___TAGEND___ The variation of the density of functional groups using the pulsed-plasma polymerization of functional-group-bearing monomers was possible by the chemically-initiated radical copolymerization with either a chain-extending monomer, such as ethylene, or a cross linker, such as butadiene, in plasma. The density of functional groups could be adjusted continuously (0 to 30 OH, 0 to 18 NH2 and 0 to 24 COOH groups per 100 C atoms).___TAGSTART___BR___TAGEND___ The successful application of these densely functionalized polymer surfaces for producing biocompatible surfaces and for use in metalpolymer composites is proposed.