Accession Number : AD0681718

Title :   RAMAN SPECTROSCOPY OF POLYMERIC MATERIALS. PART I - SELECTED COMMERCIAL POLYMERS,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Cain,Dorothy S. ; Harvey,Albert B.

Report Date : 26 DEC 1968

Pagination or Media Count : 24

Abstract : The He-Ne laser has greatly reduced the problem of fluorescence, which has in the past almost completely obscured conventionally excited (mercury arc) Raman spectra of all except the simplest and purest polymers. In many instances it is now possible to record Raman spectra of polymers without any prior purification whatsoever. A comparison of the Raman and infrared spectra of twelve selected commercial polymers shows the complementary nature of these two spectroscopic techniques for identification purposes. Vibrations such as C=C stretching (in polybutadiene) and S-S and C-S stretching (in polysulfide rubber) give rise to strong Raman lines but produce weak infrared absorption bands; conversely, the C=O group of polycarbonates and polyesters is a strong infrared absorber which produces a weak Raman line. (Author)

Descriptors :   (*POLYMERS, *RAMAN SPECTROSCOPY), (*GAS LASERS, RAMAN SPECTROSCOPY), INFRARED SPECTRA, BUTADIENES, CARBONATES, POLYESTER PLASTICS, POLYETHYLENE PLASTICS, STYRENE PLASTICS, SILOXANES, FLUORESCENCE, HELIUM, NEON, RUBBER, SYNTHETIC RUBBER

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE