Mechanism glow discharge polymerization

Competitive Ablation and Polymerization (CAP) Mechanisms of Glow Discharge Polymerization... 

Figure 1. Overall mechanism of glow discharge polymerization...

A stu of the properties of polymers formed by glow discharge polymerization from tetrafluoroethylene and investigated by electron spectroscopy for chemical analysis (ESCA) provides further evidence for the importance of the CAP mechanism (8). 

With regard to the CAP mechanisms of glow discharge polymerization, it is important to recognize the followii aspects that are inevitably involved. 

The exact mechanism of propylene glow discharge polymerization is not known. The presence of a terminal acetylene (presumable propyne) in the gaseous products of propylene polymerization was indicated by the interaction of the cold trap gaseous condensates with 1% alcoholic or ammonlacal AgNO sol.(22) after the polymerization was over. An immediate formation of an explosive silver acetyllde was detected. Intermediate formation of propyne is also indicated by the IR spectra of the yellow relatively less volatile liquid left in the cold trap after the polymerization was over. Sharp but weak absorptions at 3310 cm l and 1270 cm are indications of a substituted acetylenic compound. The IR spectra of the yellow liquid also points to the presence of mono, dl- and trl-substituted aromatic compounds in the mixture (i.e. sharp absorption bands at 3080 cm l, 1640 cm l, 920 cm , 810 cm and a multiple band in the 1000-1120 cm l region are observed). The NMR spectra in deuterated acetone indicated the presence of an aromatic nucleus in the yellow liquid obtained from the cold trap. The formation of aromatic compounds can be explained if a propynyllc Intermediate is involved. 

Wrobel, A.M., Kryszewski, M., Gazicki, M., 1978. Mechanism of polysilazane thin film formation during glow discharge polymerization of hexamethylcyclotrisilazane. Polymer 17... 

All experimental data in glow discharge polymerization can be interpreted only as circumstantial evidence so far as the mechanism of pol3nner formation is concerned. Therefore, the following discussion presented to support the concept of atomic polymerization is not intended to disprove any... 

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