期刊
MACROMOLECULES
卷 50, 期 7, 页码 2838-2844出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.7b00188
关键词
-
资金
- Air Force Office of Scientific Research (AFOSR) [FA9550-16-1-0062]
- Center for Lignocellulose Structure and Formation (CLSF), an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences [DE-SC0001090]
In poly(vinylidene difluoride) (PVDF)-based polymers, the alignment of dipoles of the crystalline beta phase with all trans 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 beta 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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据