Controlled modification of poly(hydroxybutyrate) surfaces by a perfluorohexane plasma: ESCA and contact angle studies

Abstract

SYNOPSISPoly (hydroxybutyrate) films and inorganic glass slides were treated by cold plasma. The composition of the gas mixture of perfluorohexane and hydrogen was varied to obtain controlled surface coatings of different hydrophobicities. The analysis by weight variation, scanning electron microscopy (SEM) , electron spectroscopy for chemical analysis (ESCA) , and contact angle measurements were used to evaluate the influence of the flow rate, composition, and the plasma power on the surface structure after the plasma deposition. Highresolution ESCA spectra were used to determine quantitatively the amount of different fluorine-containing species present in the plasma-deposited layers. Molecular structures and surface energies of deposited layers on polymer substrates were compared with those on inorganic substrates. In both cases a strong correlation was found between the surface free energy and the fluorine/carbon ratio as well as the oxygen/carbon ratio. Furthermore, samples with high carbon/fluorine ratios showed a high content of CF, and CF3 groups.

Plasma polymerization of perfluoroalkanes over zeolite membrane and the gas permeability of the membrane.

“…In order to prepare plasmapolymerized membranes from perfluorocarbons efficiently, adding hydrogen or hydrogen containing additives into a plasma of perfluorocarbons is an effective means for extract F atoms to form the stable HF. [8,9,10] Figure 2 shows the effects of discharge power and monomer flow rate on the deposition rate of plasma-polymerized PFH. In the case of the plasma polymerization of pure PFH, the deposition rate increased with increasing discharge power up to a value of 40 W and then sharply decreased.…”

Plasma surface treatments and biodegradation of poly(butylene succinate) sheets

“…Poly (L‐lactic acid) was treated with inorganic gas plasmas,5 and the generation of characteristic surface morphologies was observed by SEM, indicating loss of the skin layer. Surface coating of the biodegradable polymers also has been attempted using ultrathin plasma polymers with a crosslinked structure 6–9. Resistance to the deterioration by contact to water or water vapor was achieved with the hydrophobic polymer coating.…”