Time-domain dynamic opto-rheology study of polymer films using step-scan FTIR time-resolved spectroscopy (S2FTIR TRS)

Details Time-domain dynamic opto-rheology study of polymer films using step-scan FTIR time-resolved spectroscopy (S2FTIR TRS) Time-domain dynamic opto-rheology study of polymer films using step-scan FTIR time-resolved spectroscopy (S2FTIR TRS)

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..430..555w&link_type=abstract

The eleventh international conference on fourier transform spectroscopy. AIP Conference Proceedings, Volume 430, pp. 555-559 (1

Physics

Optics

Optical Methods, Rheo-Optics, Organic Compounds, Polymers

Scientific paper

Step-scan Fourier transform infrared spectroscopy in conjunction with impulse stress on polymer films has been used to monitor dynamic rheological responses in ``real time''. A novel piezo-electrically-driven polymer microrheometer was employed to apply repetitive impulses to the polymer sample while time-domain spectra were recorded. Recent results include the study of both semi-crystalline polymers such as isotactic polypropylene (iPP) and elastomers such as Estane polyester/polyurethane copolymer and Kraton tri-block copolymer. The spectral changes of iPP are consistent with frequency-domain results. For iPP at room temperature, large differences in the response times of different absorption bands are not seen. However, the orientation response of the CH3 rocking mode is slightly slower than the responses of the backbone modes. To our knowledge, this is the first reported successful step-scan FTIR time-domain dynamic polymer opto-rheology experiment. The advantages of the time-domain experiment over the frequency-domain experiment are also discussed briefly. This technique appears to be applicable to a variety of polymer samples, and examples from additional results are illustrated.

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