Mid- and Near-Infrared Investigation of Molecular Orientation in Elastomeric Networks
| Autor: | T. Buffeteau, Liliane Bokobza, B. Desbat |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Materials science
Polydimethylsiloxane Infrared business.industry 010401 analytical chemistry Near-infrared spectroscopy Astrophysics::Cosmology and Extragalactic Astrophysics Dichroism Linear dichroism Dichroic glass Polarization (waves) 01 natural sciences 0104 chemical sciences 010309 optics Condensed Matter::Materials Science chemistry.chemical_compound chemistry 0103 physical sciences Optoelectronics Astrophysics::Earth and Planetary Astrophysics business Spectroscopy Instrumentation Astrophysics::Galaxy Astrophysics |
| Zdroj: | Applied Spectroscopy. 54:360-365 |
| ISSN: | 1943-3530 0003-7028 |
| DOI: | 10.1366/0003702001949636 |
| Popis: | Segmental orientation in uniaxially stretched poly(dimethylsiloxane) (PDMS) elastomeric networks is investigated by Fourier transform infrared dichroism. Precise determination of the dichroic effects, in the mid- as well as in the near-infrared range, is obtained by polarization modulation of the incident electromagnetic field. Near-infrared spectroscopy gives the possibility of analyzing samples of several millimeters in thickness because of the reduced intensity of the absorptions. Dichroic effects measured in the near-infrared region are higher than those obtained in the mid-infrared range, thus suggesting that the vibrations are less coupled at high energies. Introduction of reinforcing filler such as silica in PDMS networks leads to an increase in orientation, attributed to the additional cross-links produced by the filler. Index Headings: Infrared linear dichroism; Polarization modulation; Near-infrared; Polydimethylsiloxane. |
| Databáze: | OpenAIRE |
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