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On confocal Raman spectroscopy of semicrystalline polymers: the effect of optical scattering

On confocal Raman spectroscopy of semicrystalline polymers: the effect of optical scattering
On confocal Raman spectroscopy of semicrystalline polymers: the effect of optical scattering
A series of semicrystalline polymers has been prepared through morphological control. Each of these has an identical refractive index but a different, well-defined, scattering behavior. From existing geometrical optical theories of confocal Raman spectroscopy, these materials should behave identically. Initially, the extent of scattering in each system was assessed quantitatively, from the near-infrared through the visible wavelength range, by UV/visible spectroscopy. The effect of optical scattering on the variation of intensity of the Raman scattered radiation with subsurface position was then examined in all four materials; the effect of surface roughness was also considered in the highest clarity system. Where surface effects are removed through careful sample preparation and the materials are interrogated using identical optical systems to mitigate against the impact of refractive index mismatch and other optical effects, the Raman response is strongly affected by the scattering characteristics of each material. A simple empirical relationship has been determined that adequately described all our specimens.
confocal raman spectroscopy, depth profiling, polyethylene blends, propylene/ethylene copolymer, optical scattering, surface roughness, pvc films, depth resolution, microspectroscopy, morphology, microscopy, melt, interfaces, refraction, diffusion
0003-7028
1475-1481
MacDonald, A. M.
d16836c0-83dd-4961-a620-bfb22f0ea014
Vaughan, A. S.
6d813b66-17f9-4864-9763-25a6d659d8a3
Wyeth, P.
cc2fbe44-9585-4f9e-b3f4-477d0a2a96cb
MacDonald, A. M.
d16836c0-83dd-4961-a620-bfb22f0ea014
Vaughan, A. S.
6d813b66-17f9-4864-9763-25a6d659d8a3
Wyeth, P.
cc2fbe44-9585-4f9e-b3f4-477d0a2a96cb

MacDonald, A. M., Vaughan, A. S. and Wyeth, P. (2003) On confocal Raman spectroscopy of semicrystalline polymers: the effect of optical scattering. Applied Spectroscopy, 57 (12), 1475-1481. (doi:10.1366/000370203322640107).

Record type: Article

Abstract

A series of semicrystalline polymers has been prepared through morphological control. Each of these has an identical refractive index but a different, well-defined, scattering behavior. From existing geometrical optical theories of confocal Raman spectroscopy, these materials should behave identically. Initially, the extent of scattering in each system was assessed quantitatively, from the near-infrared through the visible wavelength range, by UV/visible spectroscopy. The effect of optical scattering on the variation of intensity of the Raman scattered radiation with subsurface position was then examined in all four materials; the effect of surface roughness was also considered in the highest clarity system. Where surface effects are removed through careful sample preparation and the materials are interrogated using identical optical systems to mitigate against the impact of refractive index mismatch and other optical effects, the Raman response is strongly affected by the scattering characteristics of each material. A simple empirical relationship has been determined that adequately described all our specimens.

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More information

Published date: 1 December 2003
Additional Information: This article was used as the basis for a conference paper presented by all co-authors at 'Physical Aspects of Polymer Science', held at Reading University between 10-12 Sept 2003. e-Print ID for this conference: #16479
Keywords: confocal raman spectroscopy, depth profiling, polyethylene blends, propylene/ethylene copolymer, optical scattering, surface roughness, pvc films, depth resolution, microspectroscopy, morphology, microscopy, melt, interfaces, refraction, diffusion

Identifiers

Local EPrints ID: 20035
URI: http://eprints.soton.ac.uk/id/eprint/20035
ISSN: 0003-7028
PURE UUID: b3f67f02-c794-4b6e-b328-4eadb38becdd
ORCID for A. S. Vaughan: ORCID iD orcid.org/0000-0002-0535-513X

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Date deposited: 24 Feb 2006
Last modified: 15 Aug 2019 00:49

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Contributors

Author: A. M. MacDonald
Author: A. S. Vaughan ORCID iD
Author: P. Wyeth

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