Near-edge X-ray absorption fine structure spectroscopy of MDI and TDI polyurethane polymers

Journal Article · Thu Jun 03 00:00:00 EDT 1999 · Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical

DOI:https://doi.org/10.1021/jp990059w· OSTI ID:351595

Urquhart, S G; Smith, A P; Ade, H W ^[1]; Hitchcock, A P ^[2]; Rightor, E G ^[3]; Lidy, W ^[4]

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1. North Carolina State Univ., Raleigh, NC (United States). Dept. of Physics
2. McMaster Univ., Hamilton, Ontario (Canada). Brockhouse Inst. for Materials Research
3. Dow Chemical USA, Midland, MI (United States)
4. Dow Chemical USA, Freeport, TX (United States)

The sensitivity of near-edge X-ray absorption fine structure (NEXAFS) to differences in key chemical components of polyurethane polymers is presented. Carbon is NEXAFS spectra of polyurethane polymers made from 4,4{prime}-methylene di-p-phenylene isocyanate (MDI) and toluene diisocyanate (TDI) isocyanate monomers illustrate that there is an unambiguous spectroscopic fingerprint for distinguishing between MDI-based and TDI-based polyurethane polymers. NEXAFS spectra of MDI and TDI polyurea and polyurethane models show that the urea and carbamate (urethane) linkages in these polymers can be distinguished. The NEXAFS spectroscopy of the polyether component of these polymers is discussed, and the differences between the spectra of MDI and TDI polyurethanes synthesized with polyether polyols of different molecular composition and different molecular weight are presented. These polymer spectra reported herein provide appropriate model spectra to represent the pure components for quantitative microanalysis.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 351595
• Journal Information: Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical, Journal Name: Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical Journal Issue: 22 Vol. 103; ISSN 1089-5647; ISSN JPCBFK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
CHEMICAL COMPOSITION
MOLECULAR STRUCTURE
POLYURETHANES
X RADIATION