Rheo-Optical Fourier Transform Infrared And Raman Spectroscopy Of Polymers.pdf

Rheo-Optical Fourier Transform Infrared and Raman
Spectroscopy of Polymers
U. HOFFMANN, F. PFEIFER, S. OKRETIC, N. VOLKL,
M. ZAHEDI, and H. W. SIESLER*
Department of Physical Chemistry, University of Essen, D 4300 Essen, Germany
This article is intended to review recent results of simultaneous me- der -3 Rheo-optical FT-IR experiments are
chanical and Fourier transform infrared spectroscopic--so-called rheo- restricted to thin films (Fig. la), m:d the specimen to be
optical--measurements for polymer deformation studies. The technique tested can be uniaxially drawn and recovered in a min-
will also be discussed in terms of the application of Fourier transform iaturized stretching machine which fits into the sample
near-infrared light-fiber and Raman spectroscopy. Specifically, data partment of the spectrometer. During the mechan-
the bidirectional drawing of poly(ethylene terephthalate) and the strain-
induced conformational changes of poly(vinylidene fluoride) will be pre- ical treatment, interferograms are acquired in small time
sented. intervals (between about and 5 s) with radiation po-
Index Headings: FT-IR, FT-Raman, and FT-NIR light-fiber spectros- larized alternately parallel and perpendicular to the
copy; Mechanical measurements; Rheo-optics; Polymer deformation. stretching direction, and, pletion of the exper-
iment,