chemical physics of discharges - Argonne National Laboratory
chemical physics of discharges - Argonne National Laboratory chemical physics of discharges - Argonne National Laboratory
Spectroscopy Run 70 Element Found C H 0 N 861 80.51 10.31 8. 06 0. 2 63 1 75. 0 9. 5 12. 7 2. 8 291 68. 19 9. 12 13.23 8.84 93 1 55.90 7.77 18.40 17.64 very little formed no polymer formed Total I 99. 1 100. 0 99.38 39.71 The transmission infrared (Fig. 3) and internal reflectance, ATR (Fig. 4) spectra for samples 291 and 633, respectively, show very nearly identical features for the principal bands. Structural moieties such as ’ 0 -z-NH2, -CH2-, -CH3, C-N, C=N, and -OH in organic compounds give the best comparative infrared spectral features to those observed for the synthesized polymer. Spectra of polyacrylamides, polyacryloni- triles and proteins (5) of some types, give quite similar spectra. Carbon-nitrogen double or single bonds may exist in the synthesized pyymer, but there is no evidence for the strong -CEN frequency at ca. 2240 - 2260 cm- (5). Nicholls and Krishna- machari (6 ) found in microwave eTFctrodeless discharees at 2450 MHz emission u bands of NCO formed at cryogenic temperatures from the reaction I N(2P) tC0 (X Ct)+NCO at the cold surface. Thus an NCO species may enter into the polymer as an important structural entity in the present case. Conclusions Under the flow discharge conditions of this study, the RF electrodeless method appears to offer interesting synthetic possibilities with the simple inorganic gases. One might better understand the mechanism of origin of some polymers as a function of simple excited molecular, atomic or free radical precursors, generated in the discharge. The composition of the gas phase products formed in various reactions would be worth monitoring. Some of the gas products in the present study are being analyzed. t < / 4
1 1 1 moo 1400 1300 c V' I IPOO I IIUO I 1000 I eo0 I 800 Fig. 3 1nfrared.transmission spectrum of polymer, Run 291. I 4000 3500 SO00 2500 2000 1002 I600 1400 I200 1000 800 600 1 CY !, Fig. 4 Infrared ATR spectrum of polymer, Run 633. c O 100 so 80 10 60 60 40 30 20 10 0
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- Page 241 and 242: 241 Discussion The systematic varia
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1 1 1<br />
moo 1400 1300<br />
c V'<br />
I<br />
IPOO<br />
I<br />
IIUO<br />
I<br />
1000<br />
I<br />
eo0<br />
I<br />
800<br />
Fig. 3 1nfrared.transmission spectrum <strong>of</strong> polymer, Run 291.<br />
I 4000 3500 SO00 2500 2000 1002 I600 1400 I200 1000 800 600<br />
1 CY<br />
!, Fig. 4 Infrared ATR spectrum <strong>of</strong> polymer, Run 633.<br />
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100<br />
so<br />
80<br />
10<br />
60<br />
60<br />
40<br />
30<br />
20<br />
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