Vibrational analysis of d-PCL(530)/siloxane based hybrids doped with two lithiu...

• Author(s): Ferreira, C. B. ; Fernandes, M. ; Rodrigues, L. C. ; Silva, Maria Manuela ; Smith, Michael John ; Bermudez, V. de Zea
• Date: 2013
• Persistent ID: http://hdl.handle.net/1822/24804
• Origin: RepositóriUM - Universidade do Minho
• Subject(s): FTIR; Li+ conductors
• Document Type: Article
• Language: English

Description

Published online: 22 May 2013 The present study has been focused on environmentally friendly sol-gel derived electrolytes based on a di-urethane cross-linked d-PCL(530)/siloxane network (where d represents di, PCL identifies the poly(ε–caprolactone) biopolymer and 530 is the average molecular weight in g.mol-1) doped with a wide range of concentration of lithium perchlorate (LiClO4) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). Fourier Transform Infrared and Raman (FT-IR and FT-Raman, respectively) spectroscopies have been applied to evaluate the extent of ionic association. Characteristic bands of the PCL(530) segments, of the urethane cross-links and of the anions have been examined to gain insight into the cation/biopolymer, cation/anion and cation/cross-link interactions. In both electrolyte systems “free” ions and contact ions have been identified. The addition of salt modifies the hydrogen-bonded array of the host matrix, causing the destruction/formation of the urethane/urethane aggregates.