Fine structure of polyethylene prepared by. gamma. -ray-induced polymerization in various solvents. III. Selective degradation with ozone

Journal Article · Mon May 01 04:00:00 EDT 1978 · J. Polym. Sci., Polym. Phys. Ed.; (United States)

DOI:https://doi.org/10.1002/pol.1978.180160509· OSTI ID:7061899

Arai, H ^[1]; Yamaguchi, K; Mitomo, H; Kuriyama, I

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1. Japan Atomic Energy Research Inst., Takasaki

Ozone-degradation products of polyethylenes prepared by ..gamma..-ray-induced polymerization in ethyl alcohol, t-butyl alcohol, and 2,2,5-trimethylhexane were analyzed by gel permeation chromatography (GPC). The ozonized polymers show two discrete peaks in the GPC traces, and the ratio of molecular weights corresponding to the peaks is close to 1 : 2, suggesting that these polymers are composed of folded-chain crystals similar to solution-grown single crystals. The peak profiles, however, are broad and the peaks in the chromatograms shift concertedly toward lower molecular weight in the course of degradation. These findings suggest that the fold surfaces of the polymers are coarse and that there is no unique crystalline core containing a regularly folded layer. The long period estimated from small-angle x-ray measurements increases with increasing polymerization temperature, but scarcely varies with the solvent type. This implies that when crystallization occurs during polymerization, kinetic factors may have no great effect on crystallization. 3 tables; 5 figures.

• OSTI ID: 7061899
• Journal Information: J. Polym. Sci., Polym. Phys. Ed.; (United States), Journal Name: J. Polym. Sci., Polym. Phys. Ed.; (United States) Vol. 16:5; ISSN JPLPA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360402* -- Polymers & Plastics-- Structure & Phase Studies-- (-1987)
360406 -- Materials-- Polymers & Plastics-- Radiation Effects-- (-1987)
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600 -- Radiation Chemistry
ALCOHOLS
ALKANES
ALKENES
ASYMMETRY
BUTANOLS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHEMISTRY
CHROMATOGRAPHY
COHERENT SCATTERING
CRACKING
CRYSTAL STRUCTURE
DECOMPOSITION
DIFFRACTION
ETHANOL
ETHYLENE
HYDROCARBONS
HYDROXY COMPOUNDS
KINETICS
MEDIUM TEMPERATURE
MOLECULAR WEIGHT
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OZONE
POLYETHYLENES
POLYMERS
POLYOLEFINS
POWDERS
PYROLYSIS
RADIATION CHEMISTRY
RADIATION EFFECTS
REACTION KINETICS
SAMPLE PREPARATION
SCATTERING
SEPARATION PROCESSES
STRUCTURAL CHEMICAL ANALYSIS
TEMPERATURE DEPENDENCE
THERMAL CRACKING
X-RAY DIFFRACTION
YIELDS