8 / 30
allied
academies
Page 49
November 13-14, 2017 Paris, France
5
th
International Conference on
PLASMA CHEMISTRY AND
PLASMA PROCESSING
Journal of Biotechnology and Phytochemistry
Volume 1, Issue 2
Plasma Chemistry 2017
Mechanisms of a glow discharge polymerization
Vladislav Zyn
Samara State Pedagogical University, Russia
Introduction & Aim:
A classical glow discharge has the well-
known non-uniform structure. Several lights and dark bands
zones are visible clearly in a discharge gap independently of the
chemical nature of a gas used. Every zone has its own mechanism
of electrical processes. In the case of a molecular gas, these local
primary electrical processes initiate further chemical reactions
and determine their kinetics. So, it is natural to formulate the
purposes of this work as to determine whether the above-
mentioned zonal structure of the discharge is reproduced in
the spatial distribution of the polymerization products, identify
the local polymerization mechanisms, and determine their
productivity and influence of each local electrical mechanism on
properties of the products.
Method:
The objectives were achieved by means of a joint
analysis of various databases formed by different experimental
techniques. The films were grown on various surfaces, such
as electrodes, quartz probe of a microbalance, metalized
glass plates, and thin quartz filaments having been stretched
through the discharge in various directions.
In-situ
thickness
measurements were carried out with an ellipsometer. The gas
phase during the polymerization was monitored with the help of
a mass spectrometer and laser probe. Plasma processed samples
with grown films were studied by means of optical and electron
microscopy, interferometry, IR spectrometry, ESR, ESCA, atomic
scanning microscopy, analytical weighing.
Results:
Identifiedat least fiveprincipallydifferent polymerization
mechanisms: Cathodic, anodic, surface chemical reactions, the
formation of aerosols and their deposition on the substrate. It
was traced, how and through which mechanism the identity
of each local activation stage passes through all stages of the
polymerization and appears in the properties of the film grow.
The most powerful local mechanism is the cathodic one. The ion
bombardment of the cathode surface provides the most rate of
the synthesis and is responsible for creation peculiar structure
and internal stresses of the film which have shock nature and
are formed by the ion bombardment. The anodic mechanism is
activated by an electron bombardment mainly responsible for the
film growth at the surface of an anode. The energetic spectrum
of the anodic polymerization rate demonstrates thresholds and
peaks.
Conclusion:
The information obtained allows one to choose one
or another mechanism depending on the problem being solved
and organize the process accordingly
Biography
Vladislav Zyn is from Samara State Pedagogical University, Russia
zyn37@mail.ruVladislav Zyn, J Biot Phyt 2017