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Weichmacherverlust bei PVC-Objekten von Joseph Beuys – Versuche zu kurativen und konservatorischen Massnahmen
ANHANG III: ZUSAMMENSTELLUNG VON ABSTRACTS
plasma changed from 900 to 10,800 s. Through contact angle measurements, the effect of the exposure time on the
PVC wettability was investigated. Independent of t, all samples presented contact angles, [theta], equal to zero after
the treatment. However, in some cases, surface hydrophilization was not stable, as revealed by the temporal
evolution of [theta]. Samples bombarded for shorter periods recovered partially or totally the hydrophobic character
while the one exposed for the longest time stayed highly hydrophilic. These modifications are ascribed to the Cl loss
and O incorporation as shown by XPS measurements. Furthermore, the mobility of surface polar groups and the
variation in the cross-linking degree can also affect the PVC wettability.
Kaczmarek, Halina; Kowalonek, Jolanta; Szalla, Aleksandra; Sionkowska, Alina (2002): Surface modification of
thin polymeric films by air-plasma or UV-irradiation. In: Surface Science, vol.s 507-510, June 2002, S.
883-888
Commercial, purified poly(vinyl chloride) (PVC) in a form of thin film was used for modification by low-temperature air-
plasma or short-wavelength UV-irradiation. The changes of surface properties were monitored by contact angle
measurements allowing for calculation the surface free energy as well as its polar and dispersive components.
Both modification sources cause surface oxidation of PVC films, which is connected with formation of functional
groups enhancing polymer wettability. This process is very fast and efficient in air-plasma but slower during PVC
exposure to UV.
Storage of modified PVC indicates that in plasma also conformational changes occur. In case of UV-irradiated PVC
secondary, dark reactions (mainly oxidation) take place during storage at ambient conditions.
Dumitrascu, N.; Borcia, G.; Popa, G. (2001): Corona discharge treatments of plastified PVC samples used
in biological environment. In: Journal of Applied Polymer Science, Volume 81, Issue 10, Date: 6 September
2001, S. 2419-2425
The effects of the plasticizer content and of the treatments by corona discharge in helium on the morphology and on
some physico-chemical properties of the PVC surface were investigated by scanning electron microscopy (SEM), IR
spectroscopy, and contact angle measurements. A biological test of adsorption of some ions (calcium, potassium,
and sodium) from human serum sanguine on the surface of PVC was also performed. After corona discharge
treatment, the surface morphology presents a cleaning of oligomers and an increase in porosity, depending on the
treatment time and on the content of the plasticizer. Surface energy considerably increases and functionalization of
the surface is observed after treatment by corona discharge in helium. This functionalization does not change the
electrolitical equilibrium of some ions from the serum sanguine, a convenient result that controls the stability of the
blood-PVC sample interface.
Audic, J.-L.; Poncin-Epaillard, F.; Reyx, D.; Brosse, J.-C. (2001): Cold plasma surface modification of
conventionally and nonconventionally plasticized poly(vinyl chloride)-based flexible films: Global
and specific migration of additives into isooctane. In: Journal of Applied Polymer Science, Volume 79, Issue
8, Date: 22 February 2001, S. 1384-1393
Balazs, D.J.; Triandafillu, K.; Wood, P; Sardella, Harms, H.; van Delden, S.; Favia, P.; d’Agostino, R.; Hollenstein, C.;
.; Mathieu, H.J. (2001): Surface modification of PVC endotracheal tube surfaces to reduce
pseudomonas aeruginosa adhesion: plasma processing and chemical methods. In: European Cells
and Materials, Vol. 6, Suppl. 1, S. 86