/sup 1/H nuclear magnetic resonance studies of domain structures in polymers

Journal Article · Tue Sep 01 04:00:00 EDT 1981 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.329534· OSTI ID:6232867

Cheung, T T.P.; Gerstein, B C

The structures of amorphous (noncrystalline) domains in polyethylene, conditioned (at 150 /sup 0/C for 15 min) and unconditioned polypropylene films and a vitrain portion of Kentucky No. 6 coal have been investigated using the Goldman-Shen NMR pulse sequence which monitors the transfer of /sup 1/H magnetization from the amorphous to the crystalline domains. The diffusion equation is solved with respect to such transfer. The size and shape of the amorphous domain is inferred by fitting the theoretical results to the experimental data. It seems that the layer-like configuration is a poor description for the polyethylene and polypropylene films unless the spatial orientation of the amorphous domain is isotropic. However the spherical configuration is inadequate for Kentucky No. 6 vitrain. The average width b-bar of the amorphous domain is 90--150 A for polyethylene, 20--30 A for uncontinued polypropylene film, and 30--50 A for the conditioned films. The diffusion of magnetization in the amorphous domain of Kentucky No. 6 is faster than that of the polymers, though the dipolar interaction is much weaker in the former. A transfer process due to tranlational motion of small mobile chemical species is suggested.

• Research Organization: Ames Laboratory-DOE, and Department of Chemistry, Iowa State University, Ames, Iowa 50011
• OSTI ID: 6232867
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 52:9; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360404* -- Materials-- Polymers & Plastics-- Physical Properties-- (-1987)
AMORPHOUS STATE
BARYONS
CARBONACEOUS MATERIALS
COAL
CONFIGURATION
DATA
DIFFUSION
DOMAIN STRUCTURE
ELEMENTARY PARTICLES
ENERGY SOURCES
FERMIONS
FILMS
FOSSIL FUELS
FUELS
HADRONS
HIGH TEMPERATURE
INFORMATION
ISOTROPY
MAGNETIC RESONANCE
MAGNETIZATION
MATERIALS
MATHEMATICAL MODELS
NUCLEAR MAGNETIC RESONANCE
NUCLEONS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
ORIENTATION
POLYETHYLENES
POLYMERS
POLYOLEFINS
PROTONS
RESONANCE
SPHERICAL CONFIGURATION
THEORETICAL DATA