An ATR attachment was adapted to a FTIR spectrometer. The increased sensitivity makes it possible to measure spectra of transferred monolayers. The characteristic vibrational frequencies of the transferred multilayer systems of two different substance types (octadecanoic acid, octadecylamine) were investigated in dependence on the layer number. A direct correlation between the absorbance and the transferred substance quantity was found. The absence of interaction between the first layer and the germanium surface was evidenced by the lack of a difference between multilayer spectra divided by the layer number, and the measured spectrum of one layer.

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Acta Polymcrica 35 (1984) Nr. 9 584 WIEDEMANN, WUSTYANN u. a. : Analytische Charakterisierung von Methacrylsilan auf Glasseidengewebe 900 re@ 2~ao s wo t Fig. 8. Dependence of absorbance of C=O groups on the time of oxidation for precursor pitch carbon fibres, oxidized a t isothermal conditions: 1 -oxidation temperature 553 K; 2 -oxidation temperature 483 K ; 3 -oxidation temperature 413 K -I 900 lea 27w s 36m t Fig. 9. Dependence of absorbance of the group C-0-0-C for precursor pitch carbon fibres on the time of oxidation a t isothermal conditions: I -oxidation temperature 553 K ; 2 -oxidation temperature 483 K ; 3 -oxidation temperature 413 K C=O a t 1700 cm-1, C-0 a t 1320 t o 1210 cm-l, peroxide groups C-0-0-C a t 1180 cm-l. Results of these calculations are presented in Figures 7 t o 10. It results from Fig. 7 t h a t t h e content of C-0, C=O and C-0-0-C groups increases as t h e temperature is increased t o 553 K. Exceeding 553 K does not cause a n y quantitative or qualitative changes in oxidized fibres. The content of C=O, C-0 and C-0-0-C groups depends only on t h e time of treatment in a n adequate temperature (Figs. 8 t o 10).