Handbook of Solvents - George Wypych - ChemTech - Ventech!

568 George Wypych
Cl2p/ClLMM
1
0.9
CCl 4
0.8
TLC
0.7
DCM
0.6
DCE
0.5 THF
CHCl
3
DXN
0.4
20 15 10 5 0 5 10 15 20
DN AN
Figure 10.1.3. Intensity ratio vs DN and AN. [Adapted,
by permission, from M L Abel, M M Chehimi,
Synthetic Metals, 66, No.3, 225-33 (1994).]
Thickness, angstrom
10
8
6
4
2
0
0.4 0.5 0.6 0.7 0.8 0.9 1
Cl2p/ClLMM
Figure 10.1.5. Thickness of PMMA overlayers vs.
intensity ratio. [Data from M L Abel, M M Chehimi,
Synthetic Metals, 66, No.3, 225-33 (1994).]
PMMA surface content, %
0
0.4 0.5 0.6 0.7 0.8 0.9 1
The determination of properties of unknown
system requires that master curve be
constructed. This master curve is determined
by testing a series of different polymers
exposed to a selected solvent. An
example of such a relationship is given in
Figure 10.1.1. The enthalpy change caused by the acid-base adduct formation is obtained
from a study of the same solid with different solvent probes (see Figure 10.1.2). Having this
data, coefficients E and C can be calculated from the chemical shifts in any system.
Figure 10.1.3 shows that there is a correspondence between DN and AN values of different
solvents and Cl(2p)/Cl(LMM) intensity ratios. 7 Figure 10.1.4 shows that the type of
solvent (measured by its Cl(2p)/Cl(LMM) intensity ratio) determines adsorption of basic
PMMA on acidic polypyrrole. Figure 10.1.5 shows that also the thickness of PMMA
overlayer corresponds to Cl(2p)/Cl(LMM) intensity ratio of solvent.
50
40
30
20
10
Cl2p/ClLMM
Figure 10.1.4. PMMA surface content vs. intensity ratio.
[Data from M L Abel, M M Chehimi, Synthetic Metals,
66, No.3, 225-33 (1994).]
Figure 10.1.6. Schematic diagram of surface roughness
of polypyrrole and deposition of PMMA from two
different solvents. [Adapted, by permission, from
M L Abel, J L Camalet, M M Chehimi, J F Watts,
P A Zhdan, Synthetic Metals, 81, No.1, 23-31 (1996).]