Vibrational Sum Frequency Generation (SFG) Analysis of Ferroelectric Response of PVDF-Based Copolymer and Terpolymer
Journal Article
·
· Macromolecules
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Chemical Engineering and Materials Research Inst.
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Mechanical and Nuclear Engineering
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Materials Science and Engineering
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Chemical Engineering, Materials Research Inst., and Dept. of Materials Science and Engineering
In poly(vinylidene difluoride) (PVDF)-based polymers, the alignment of dipoles of the crystalline $$β$$ phase with alltrans conformations is responsible for ferroelectricity; however, there is a lack of direct spectroscopic evidence for this phenomenon. We report in situ monitoring of the molecular orientations associated with ferroelectric responses of PVDF-based polymers using vibrational sum frequency generation (SFG) spectroscopy. The orientation of CH2 groups with respect to the -(CH2CF2)n- chain axis of the poled $$β$$ domains in a PVDF copolymer was determined from the SFG dependence of an uniaxially aligned sample on the laser polarization and azimuthal angle. The relative intensities of CH2 symmetric and asymmetric stretch modes as well as their total intensities revealed the transformation of the all-trans conformation domains during the electrical poling of PVDF based co- and terpolymer films.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Center for Lignocellulose Structure and Formation (CLSF)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- SC0001090
- OSTI ID:
- 1388295
- Journal Information:
- Macromolecules, Journal Name: Macromolecules Journal Issue: 7 Vol. 50; ISSN 0024-9297
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Static and dynamic electro-optical properties of liquid crystals mediated by ferroelectric polymer films
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journal | January 2018 |
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