Fluorescence-free Raman spectra of polymers

Francis J. Purcell; Job M. Bello

doi:10.1117/12.22903

1 November 1990 Fluorescence-free Raman spectra of polymers

Francis J. Purcell, Job M. Bello

Proceedings Volume 1336, Raman and Luminescence Spectroscopies in Technology II; (1990) https://doi.org/10.1117/12.22903
Event: 34th Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1990, San Diego, CA, United States

Abstract

Raman spectroscopy has provided a large body of information on the characterization of polymers. It supplies molecular data on properties such as identity, isomerization, branching and conformation. Raman spectroscopy has however, suffered from the problem of fluorescence interference, which has limited its usefulness as a general analytical tool for the characterization of polymers. The fluorescence is generated by a number of sources like plasticizers, coloring agents, • sizings and impurities. Two recent technical developments have effectively eliminated this problem. Both of these developments are based on near-IR excitation outside the fluorescence absorption band. The first, uses a cw Nd:YAG laser as the source and an interferometer to analyze the scattered light. The other utilizes excitation between 700 and 800 nm from a krypton, diode or solid state tunable laser as the source and a charge-coupled device detector. Both of these techniques enjoy a multiplex advantage, either from the interferometer or the detector, to overcome the loss of Raman scattering efficiency on moving into the infrared. This paper will compare the benefits and disadvantages of these two techniques and discuss their applications to materials like polyimides, polyetheretherketone and other packaging materials and fibers such as polyethylene terephthalate.

Citation Download Citation

Francis J. Purcell and Job M. Bello "Fluorescence-free Raman spectra of polymers", Proc. SPIE 1336, Raman and Luminescence Spectroscopies in Technology II, (1 November 1990); https://doi.org/10.1117/12.22903

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