A rheo-optical FTIR spectrometer for investigating molecular orientation and viscoelastic behavior in polymers

Gerald R. Hofmann, Michael S. Sevegney, Rangaramanujam M. Kannan

Research output: Contribution to journalArticlepeer-review

Abstract

A rheo-optical Fourier transform infrared (FTIR) spectrometer has been developed by combining step-scan FTIR spectroscopy with elements of polarimetry and rheometry in order to investigate both deformation-induced morphology changes and orientation/relaxation dynamics of components within complex polymers. This versatile instrument can directly and sensitively measure quantitative infrared spectra at different temperatures and for different deformation modes. A complex, multiple-modulation/demodulation processing scheme is used to extract both absorbance and dichroism information from a single detector signal. Experimental results from a semicrystalline isotactic polypropylene and a thermoplastic polyurethane are reported in order to illustrate instrument capabilities.

Original languageEnglish (US)
Pages (from-to)245-274
Number of pages30
JournalInternational Journal of Polymer Analysis and Characterization
Volume9
Issue number4
DOIs
StatePublished - Jul 2004
Externally publishedYes

Keywords

  • FTIR spectroscopy
  • Polymer structure-property relationships
  • Rheo-optics

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Polymers and Plastics

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