Ethane plasma-polymerized

Effect of discharge frequency on the rate of ethane plasma polymerization [after Morita... 

The dendritic growth of lithium was suppressed on a lithium electrode surface modified by an ultrathin solid polymer electrolyte prepared from 1,1—difluoro-ethane by plasma polymerization [114]. 

Effect of Discharge Frequency on the Plasma Polymerization of Ethane... 

Gaseous monomer of ethane was purchased from the Matheson Gas Co.. The plasma polymerized ethane (PPE) was deposited on aluminum foil set on the discharge electrode throughout this work and the... 

Figure 3. Effect of discharge frequency on the growth rate of plasma-polymerized ethane and the discharge voltage and current of ethane at 0.5 torr, 20 cm STP/min, and 10 W at room temperature (a) growth rate (b) discharge voltage...

Figure 4. IR spectrum for plasma-polymerized ethane at 13.56 MHz, 2.0 torr,...

Figure 6. Plot of tan 8 vs. temperature for plasma-polymerized ethane formed at 0.5 ton, 20 cmsSTP/min, 5 W, and KHz. Film thickness was 820 A. (9) Measured at 1 KHz and (X) measured at 10 KHz.

Figure 8. Activation energy plot for plasma-polymerized ethane formed at discharge frequencies of 5KHz (X) and 13.56 MHz ( )...

The rate of plasma polymerization depends on the nature of the monomer gas. In addition, such parameters as flow rate, pressure, power, frequency, electrode gap and reactor configuration also strongly influence the polymerization rate for a given monomer. Generally at low flow rates there is an abundance of reactive species so the polymerization rate is limited only by the availability of monomer supply. At high flow rates, however, there is an overabundance of monomer concentration and the polymerization rate now depends on the residence time. At intermediate flow rates these two competing processes result in a maximum. This behavior is illustrated in Figure 1 for ethane, ethylene, and acetylene (11). These data also demonstrate the effect of increased unsaturation in... 

Figure 1. Rates of plasma polymerization of acetylene, ethylene, and ethane as a function of monomer flow rate (llj...

Figure 7. The rate of plasma polymerization of ethane as a function of discharge...

Figure 11. Characteristic map for the plasma polymerization of ethane (102j...

The use of thin films derived from chlorotri-fluoroethylene as optical device protective coatings has been reported (100,101). Not only do the films protect the moisture sensitive substrates from atmos-phereic humidity but they also exhibited antireflection properties. Reis, et. al. (102) and Hiratsuka, et. al. (103) explored the use of plasma polymerized ethane as protective coatings for laser windows. The absorption and antireflection characteristics of these coatings were reported. 

Most studies of plasma polymerization have been conducted in continuous wave rf plasmas. The effects of pulsed mode operation have received only limited attention. In a recent study, Yasuda et al. (1 ) found that while the polymerization rate of most monomers decreased when polymerization was carried out in a pulsed versus continuous plasma, the polymerization rate of a few monomers was enhanced. The present study was undertaken to determine the effects of pulsed operation on the plasma polymerization of ethylene and ethane. These monomers were selected because their behavior in continuous wave plasmas had been examined extensively in previous investigations (2 - ). ... 

A scheme for bicyclic dimer formation from HMCTSN under plasma conditions has been proposed in our previous paper (J.) According to this scheme, formation of new Si-N bonds with tertiary nitrogen between trisilazane rings leads to crosslinking of the polymer, and involves the production of hydrocarbons such as methane and ethane. Indeed, gas chromatographic analysis of the gaseous residue after plasma polymerization has shown that it consists mainly of three hydrocarbons methane, ethane and ethylene in the 5 33 4 ratio. 

The polymers resulting from plasma polymerizations do not bear simple stochiometric relations to the starting monomers. The plasma polymerization of ethane, C2H6, leads to a polymer with the approximate composition C2H3. Sometimes oils are produced which consist of highly branched oligomers. Films from plasma polymerizations are inevitably cross-linked and insoluble. The term plasma polymerization is thus a misnomer. The plasma polymerization is not a molecular polymerization as, e.g., the addition polymerization of... 

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