Soft x-ray absorption spectroscopy. Electronic and morphological structure of poly(vinylidene fluoride)
- Univ. of California, Berkeley
X-ray absorption studies were carried out for the first time on a polymeric thin film in the energy range 250 to 1000 eV, thereby providing access to the K edges of light elements. The carbon and fluorine K edges were studied in poly(vinylidene fluoride). Sharp peaks were observed at both edges, and extended fine structure (EXAFS) was found at higher energies. The carbon K edge showed compound structure, with a chemical shift of 3.9 eV between the Cl(1s) absorption energies in CH/sub 2/ and CF/sub 2/ groups. This type of shift is similar to, but not identical with, ESCA shifts. Fourier transformation of EXAFS structure above the F K edge yielded a C to F bond distance of 1.38 +- 0.02 A and a second peak at 2.45 +- 0.08 A, which is comprised of contributions from several neighbor shells, providing evidence of structural order. This method is concluded to be useful in studying polymeric electronic structure and molecular conformation.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5130366
- Journal Information:
- J. Am. Chem. Soc.; (United States), Vol. 102:18
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
FLUORINATED ALIPHATIC HYDROCARBONS
ELECTRONIC STRUCTURE
K ABSORPTION
MOLECULAR STRUCTURE
POLYVINYLS
ABSORPTION SPECTROSCOPY
BOND LENGTHS
CHEMICAL SHIFT
FOURIER TRANSFORMATION
SOFT X RADIATION
ABSORPTION
DIMENSIONS
ELECTROMAGNETIC RADIATION
HALOGENATED ALIPHATIC HYDROCARBONS
INTEGRAL TRANSFORMATIONS
IONIZING RADIATIONS
LENGTH
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
POLYMERS
RADIATIONS
SPECTROSCOPY
TRANSFORMATIONS
X RADIATION
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)
360402 - Polymers & Plastics- Structure & Phase Studies- (-1987)