Jd. Liao et al., ACTIVATION OF POLYMER SURFACE FOR BIOMEDICAL MONOMER GRAFTING - UTILIZATION OF COLD-PLASMA IN COMPARISON WITH ION-IMPLANTATION, Le Vide, les couches minces, (272), 1994, pp. 624-628
Citations number
12
Categorie Soggetti
Physics, Applied","Materials Science, Coatings & Films
After 60 sec of argon plasma treatment, the hydrophobic polyolefins be
came very wettable with a polar liquid due to the formation of highly
polarizable groups at surface. The polyolefins after ion implantation
with a dose lower than 2 x 10(14) ions.cm(-2) mainly produced simple o
xidative structures; such weak surface activation resulted in a relati
vely small increase of wettability. The wettability study was correspo
nding with the findings of the ir-active carbonyl, the e.s.r patterns
of free radicals and the oxygen functionalities in ESCA spectra. The p
-HEMA grafted sample was surface-roughened nnd water-absorbable; it wa
s very hydrophilic, unlike the oxygen-containing polymer surface. The
likely-bonded p-HEMA was etchable and estimated smaller than 0.8 mu g.
cm(-2). However, the weight increase of the grafted sample showed prob
ably as high as 32 mu g.cm(-2) for PE with argon plasma pretreatment.
Water absorption and HEMA homo-polymerisation on the activated sample
should contribute to the shift of the grafting yield.