By Jan W. Gooch
`...In end, this e-book might be a really worthy resource of reference for the polymer analyst operating in academia or who has to characterise and deformulate a variety of polymer products.'
Polymer trying out, 18:231-232 (1999)
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Extra resources for Analysis and Deformulation of Polymeric Materials: Paints, Plastics, Adhesives, and Inks
Correlation of infrared spectra with molecular structure. The infrared spectrum of a compound is essentially the superposition of absorption bands of specific functional groups, yet subtle interactions with the surrounding atoms of the molecule impose the stamp of individuality on the spectrum of each compound. 1 lists chemical groups and their infrared absorption frequencies. For qualitative analysis, one of the best features of an infrared spectrum is that the absorption or the lack of absorption in specific frequency regions can be correlated with specific stretching and bending motions and, in some cases, with the relationship of these groups to the remainder of the molecule.
At first sight, it would appear that transmission microscopes, illuminating the whole sample, would not be capable of such application. In general, this is so. However, a new transmission microscope, the EMMA 4, has been developed with combined transmission microscope and probe capability by the introduction of a “minilens” in the illumination system (Cooke and Duncumb, 1969; Jacobs, 1971). This instrument should be considered a special case of microprobe analysis, also treated in this volume (Hutchins, 1974).
In the deviation of information from an infrared spectrum, prominent bands in this region are noted and assigned first. 0 µm), the absorption is characteristic of hydrogen stretching vibrations with elements of mass 19 or less. When coupled with heavier masses, the frequencies overlap the triple-bond region. 5 µm), is often termed the unsaturated region. 0 µm). 5 µm). By judicious application of accumulated empirical data, it is possible to distinguish among C=O, C=C, C=N, N=O, and S=O bands. 4 µm) are single-band stretching frequencies and bending vibrations (skeletal frequencies) of polyatomic systems which involve motions of bonds linking a substituent group of the remainder of the molecule.
Analysis and Deformulation of Polymeric Materials: Paints, Plastics, Adhesives, and Inks by Jan W. Gooch