DETAILED MULTITECHNIQUE SPECTROSCOPIC SURFACE AND BULK CHARACTERIZATION OF PLASMA POLYMERS DEPOSITED FROM 1-PROPANOL, ALLYL ALCOHOL, AND PROPARGYL ALCOHOL
F. Fally et al., DETAILED MULTITECHNIQUE SPECTROSCOPIC SURFACE AND BULK CHARACTERIZATION OF PLASMA POLYMERS DEPOSITED FROM 1-PROPANOL, ALLYL ALCOHOL, AND PROPARGYL ALCOHOL, Journal of applied polymer science, 59(10), 1996, pp. 1569-1584
Three monomers with different degrees of unsaturation, 1-propanol, all
yl alcohol, and propargyl alcohol, are plasma-deposited to obtain alco
hol functions containing polymers. To obtain information on the behavi
ors of these monomers in the plasma, the polymers deposited in the rea
ctor and in the postdischarge region are characterized by high-energy
resolution XPS, IR, HREELS, elemental analysis, and chemical derivatiz
ation. XPS results show that oxygen-rich polymers can be obtained from
the unsaturated monomers at low power for both regions or at high pow
er in the postdischarge region. In the reactor at high power, fragment
ation of the monomer leads to the elimination of oxygen fragments and
ablation reactions during the polymerization process. Detailed structu
ral information on the chemical structure and content of functional gr
oups are obtained by simulation of the XPS C1s core levels of the poly
mers before and after derivatization with trifluoroacetic anhydride. I
n soft conditions, allyl alcohol leads to the formation of polymers wi
th a relatively low degree of crosslinking and a high hydroxyl content
(53-72%). However, the high resolution of the XPS spectrometer allows
one to detect the presence of secondary or tertiary alcohol functions
resulting from chain branching reactions in this polymer. Results fro
m this multitechnique characterization indicate also that the hydroxyl
conversion and crosslinking reactions are more pronounced for poly(1-
propanol) and poly(propargyl alcohol). Alcohol, ether, and carbonyl fu
nctions are present in equivalent quantities in poly(propargyl alcohol
) while poly(1-propanol) contains mainly ether functions (50%). The pr
esence or absence of alcohol functions at the extreme surface of the p
olymers in relation to the chain mobility and the tendency of hydrogen
bonding between hydroxyl groups was studied by HREELS. (C) 1996 John
Wiley & Sons.