Studium povrchu polymernich struktur modifikovanych v nizkoteplotnim plazmatu.

Surfaces of CA membranes were modified by plasma polymerisation using EDA or n-BA as a predursor. Membranes were analysed with respect to the highest possible immobilisation enzyme capacity. Both XPS and FTIR analyses revealed increasing nitrogen content in the treated surface layer with increasing duration and intensity of the modification. Fluorocarbon thin films were prepared by radiofrequency magnetron sputtering in the planparallel electrode system, using PTFE target. The purity of the precursor was checked using x-ray microanalysis. The sputtering was done in argon, in nitrogen or in SSGD mode at different pressures and substrate temperatures. The structure of fluorocarbon thin films was studied by FTIR RAS, XPS, NRA and SEM. Measurement of depolarisation currents was performed. The dielectric relaxations in fluorocarbon films made by magnetron sputtering of PTFE were studied using the depolarisation current method. The two dielectric relaxation processes were observed. The first one was associated with high dipole polar groups such as hydroxyl and carbonyl groups. The second relaxation process was observed only at higher temperatures. In the region of main relaxation process, experimental points were fitted by means of Kohlrausch-Williams-Watts depolarisation function and dielectric parameters were determined.Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi