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Chemical Speciation by NEXAFS Spectromicroscopy: Insights from Molecular Modelling of Polymers

Published online by Cambridge University Press:  15 February 2011

S. G. Urquhart ,
A. P. Hitchcock ,
E. G. Rightor ,
A. P. Smith  and
H. Ade
S. G. Urquhart
Affiliation:
McMaster University, Brockhouse Inst. for Materials Research, Hamilton, Canada L8S 4M1
A. P. Hitchcock
Affiliation:
McMaster University, Brockhouse Inst. for Materials Research, Hamilton, Canada L8S 4M1
E. G. Rightor
Affiliation:
Dow Chemical USA, Texas Polymer Centre, Freeport, TX 77541
A. P. Smith
Affiliation:
North Carolina State University, Department of Physics, Raleigh, NC 27695
H. Ade
Affiliation:
North Carolina State University, Department of Physics, Raleigh, NC 27695
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Abstract

Near Edge X-ray Absorption Fine Structure (NEXAFS) spectroscopy of polymers performed in a scanning transmission X-ray microscope (STXM) can provide chemical speciation with <0.1 gm spatial resolution in imaging mode. The core excitation spectra of molecular compounds that are structural analogues of polymers help interpret the NEXAFS spectra of polymers. The effect of nt-delocalization on polymer NEXAFS is discussed and illustrated by comparison to molecular spectra. Extended Htickel calculations are particularly useful for providing insight into the relationship between chemical structure and the molecular and polymer spectra. We report the interpretation of experimental NEXAFS spectra of polyethylene terephthalate (PET). Molecular models indicate that NEXAFS will be sensitive to structural isomerization in polyester polymers. We demonstrate the capability of NEXAFS to distinguish hard-segment and soft-segment phase segregation in polyurethanes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 437: Symposium DD – Applications of Synchrotron Radiation to III , 1996 , 243
Copyright
Copyright © Materials Research Society 1996

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