Some aspects of plasma polymerization of fluorine‐containing organic compounds

Abstract

The polymerization of perfluorocarbons and fluorohydrocarbons was investigated by using both continuous and pulsed rf discharge (100 μsec on and 900 μsec off). Plasma polymerization of perfluorocarbons is generally slower than that of hydrocarbons, which seems to be due to the absence of contribution of fluorine detachment to the plasma polymerization. Presence of multiple bond(s) or cyclic structure in a monomer is necessary to obtain high enough polymerization; however, the plasma polymerization mechanism postulated to plasma polymerization of hydrocarbons is still valid to these monomers. Cyclic structure is very effective to enhance the plasma polymerization capability of perfluorocarbons. Saturated straight‐chain perfluorocarbons do not polymerize well in plasma, but the grafting of fluorine‐containing functions on the surface of polymeric substrate can be achieved by the plasma of these compounds. The effect of pulse on the plasma polymerization was found to be similar to that found for hydrocarbons.

The growth and chemical structure of thin photonic films formed from plasma copolymerization. Part II. Effect of monomer feed location

“…Different from conventional 'wet' chain-growth polymerization, the sequence of formation and dissipation reactions in plasma polymerizations are not sequential but independent [9]. During the collision initiation of benzene and OFCB, two major synthetic routes are involved: Creation of monofunctional activated species, M%, by dehydrogenation and defluorination and creation of difunctional and/or multifunctional intermediates, %M% by opening of p-bond connections of benzene and the breaking of a cyclic structure (for both benzene and OFCB) as shown in reactions (1)-(4) [9,32]. The subscripts i, j, or k indicate the difference in size of the species involved with i%j%k (iZjZk is possible).…”

“…Termination occurs as described in reactions (5) and (6) [9,32], although the formation of many activated aliphatic and vinyl species by breaking benzene monomer rings allows the possibility of disproportionation. For homopolymerization, the OFCB deposition rate was much lower than that of benzene under similar reaction conditions.…”

X-Ray Photoelectron Spectroscopy for Characterization of Engineered Elastomer Surfaces

“…In this way, the surface being fluorinated should not be immersed in reagents and is not directly exposed to the plasma [62]. This treatment can be performed at room temperature and is faster than other fluorination methods [68]. All these advantages are important for industrial application.…”

Preliminary Electrical Characterization of Pulsed-Plasma Enhanced Chemical Vapor Deposited Teflon-like Thin Films

“…Pulsing the plasma can also provide some degree of control over the amount of ion bombardment to which a substrate is exposed, and subsequently, the density of dangling bonds in a film. 6 , 8 Yasuda et al have done an extensive analysis comparing materials deposited by pulsed vs. continuous plasma excitation for a variety of hydrocarbons and fluorocarbons. 6 …”