Mechanism of Organic Layer Formation in Low-Pressure Plasmas: Layer Formation in the Positive Column with Styrene

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Abstract
The formation of organic layers by decomposition of styrene in the positive column of a glow discharge is studied by a complex analysis of the gas phase and of the layer. The positive column is used as a flow tube whereby time resolution of layer formation and decomposition of styrene as monomer is possible. The product distribution qualitatively is independent of discharge conditions. Quantitatively a dependence of a parameter called specific decomposition energy εv exists. The composition and properties of the layer depend on the parameter e and a second parameter εVW termed the specific cross linking energy. A model of layer formation is proposed which includes some different models discussed in the literature which are specific cases of this general model. The different cases depend on the parameters mentioned above. Methods used for analysis of the layer are gas chromatography, mass spectroscopy, ER spectroscopy, EPR spectroscopy, solvent fractionation, elementary analysis, molecular weight determination, thermal investigations, and electron microscopy.