Vibrational spectra and microstructure of poly(ε-caprolactone)/siloxane biohybrids doped with lithium triflate
✍ Scribed by S.C. Nunes; V. de Zea Bermudez; D. Ostrovskii; Nuno V. Martins
- Book ID
- 103838065
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 602 KB
- Volume
- 879
- Category
- Article
- ISSN
- 0022-2860
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✦ Synopsis
Fourier Transform infrared (FT-IR) and Raman (FT-Raman) spectroscopies and Scanning Electron Microscopy (SEM) were used to investigate ionic association, hydrogen bonding and morphology in a family of sol-gel derived lithium triflate (LiCF 3 SO 3 )-doped di-urethane cross-linked poly(e-caprolactone) (PCL( 530))/siloxane hybrid electrolytes. The materials studied, with compositions 1 > n P 0.5 (where n -composition -expresses the molar ratio of PCL(530) ester repeat units per Li + ion), are non-porous and homogeneous. The Li + ions interact with the urethane and ester carbonyl oxygen atoms within the whole range of salt concentration analyzed, promoting the formation of hydrogen-bonded aggregates. The composition dependence of the relative concentration of ''free'' anions and coordinated anions (weakly coordinated anions, Li þ CF 3 SO 3 À ion pairs or [Li(CF 3 SO 3 ) 2 ] À triplets, aggregates I ([Li 2 (CF 3 SO 3 )] + ) and aggregates II ([Li 3 (CF 3 SO 3 )] 2+ ) in all the samples is in perfect agreement with the values of the room temperature ionic conductivity reported previously.