Propylene polymerization glow discharge

Propylene Glow Discharge Polymerization in the Presence of Bromotrichloromethane... 

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. 

Figure 2. Polymerization efficiency of propylene glow discharge polymerization as function of monomer flow rate (from results in Fig. 1).

Figure 1. Effect of substrate position on the mass of glow-discharge polymerized propylene, deposited per unit area of Aluminum substrate polymerization time 3 hours, monome flow rates indicated.

In general, the results on glow discharge polymerized propylene... 

Figure 3. Mass spectroscopy data for Propylene and for Glow-Discharge Effluent of Propylene Polymerization at high (336 ymol/min) and Low (50 ymol/min) Flow rate. Ionization 15 Volt.

Glow discharge polymers are different than those formed by conventional means. Their physical or chemical properties depend on reaction parameters, such as R.F. power, flow rate, and pressure. They have little in common with their conventionally synthesized counterparts. The monomer gas is the most likely source of elements forming the films (12). The propylene polymers used for the application to oxygen sensors were characterized by a density of 1.11-g/cm, refractive index 1.540, and chemical composition (CiH 59 0 006to conventionally polymerized polypro-... 

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