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- Plasma modification (5)
- Functional groups (3)
- Introduction of functional groups (3)
- Peel strength (3)
- Pulsed plasma (3)
- Pulsed plasma polymerization (3)
- Acrylic acid (2)
- Allyl alcohol (2)
- Allylamine (2)
- Aluminium (2)
- Metal-polymer systems (2)
- Plasma polymerization (2)
- Polypropylene (2)
- Reactions at polymer surfaces (2)
- r.f. pulsed plasma (2)
- Adhesion (1)
- Adhesion promoters (1)
- Adhesion promoting interlayers (1)
- Adhesion-promoting interlayers (1)
- Adhesion-promoting plasma polymer layers (1)
- Al-functional group interactions (1)
- Attenuated total reflectance-Fourier transorm infrared spectroscopy (1)
- Charcterization of homo- and copolymers (1)
- Chemical conversion of functional groups (1)
- Chemical reduction of functional groups (1)
- Co-polymers (1)
- Conducting films (1)
- Cone calorimeter (1)
- Copolymers (1)
- Degradation (1)
- Doping with metal atoms (1)
- ESCA/XPS (1)
- Encapsulation of nanoparticles (1)
- Flame retardance (1)
- Fluorination kinetics (1)
- Gas phase fluorination of PE (1)
- Grafting (1)
- Heat release (1)
- Long-term stability (1)
- Metal-polymer composites (1)
- Metal-polymer interactions (1)
- Metal-polymer interface (1)
- Oxygen low-pressure plasma treatment of polymers (1)
- PET (1)
- Photoelectron spectroscopy (1)
- Plasma (1)
- Plasma bromination (1)
- Plasma polymer (1)
- Plasma polymers with functional groups (1)
- Plasma surface treatment (1)
- Plasma treatment (1)
- Plasma-initiated copolymerization (1)
- Poly(ethylene terephthalate) (1)
- Poly(propylene) (PP) (1)
- Poly(tetrafluoroethylene) (1)
- Polyamides (1)
- Polyethylene (1)
- Polymer surfaces (1)
- Polymer-metal composites (1)
- Reactions at Polymer surfaces (1)
- Selective plasma process (1)
- Spacer (1)
- Spacers (1)
- Surface modification (1)
- Surfaces (1)
- Weathering (1)
- X-ray (1)
- X-ray photoelectron spectroscopy (1)
Polymer surfaces were modified in low-pressure glow discharge plasmas for introduction of monotype functional groups of different type and density. For this purpose three ways are selected, (i) oxygen plasma treatment followed by wet-chemical reduction of O functional groups to OH groups, (ii) plasma bromination for introducing C - Br groups and (iii) coating by deposition of thin plasma (co-) polymerized layers of functional groups-bearing monomers with OH, NH2, COOH, epoxy etc. functionalities. Subsequently, these groups were used as anchoring points for chemical grafting of spacer molecules, oligomers, prepolymers, fluorescent labels, ionic and nucleic acid residues, employing different chemical routes. The yield in monosort functional groups at polymer surfaces ranged from 1014 (process i), 2040 (process ii) and 1831 groups per 100 C atoms (process iii) as measured by XPS after derivatization. The consumption of functional groups amounted to 4090% of all functionalities present at the surface and depended on the dimensions of grafted molecules. For infinitely variably tuning the number of functional groups process iii was performed as copolymerization of a functional group-carrying comonomer with a non-functionalized (chain-extending) comonomer.
Communication: Fire retardant coatings are deposited on polyamide-66 using plasma polymerisation. Chemical composition and thickness of deposits are adjusted varying the plasma treatment based on hexamethydisiloxane mixed with oxygen. The fire retardancy performances are evaluated using a cone calorimeter. The correlation between fire retardancy and thickness as well as chemical composition is discussed.
Polymer surfaces can be finished with functional groups upon exposure to a plasma. Species of the plasma gas are attached at surface carbon atoms, forming functional groups of different composition. To produce a modified polymer surface with a high density and homogeneity of hydroxyl groups only, the oxygen-plasma-formed oxygen functional groups were chemically reduced by diborane and LiAlH4 with yields of 10 to 11 OH groups per 100 carbon atoms in the 3 to 5 nm near-surface layer as detected by X-ray photoelectron spectroscopy (XPS). The identification of hydroxyl groups was performed by means of attenuated total reflectanceFourier transform infrared spectroscopy and XPS.