Thermal analysis of polyethylene prepared by. gamma. -ray-induced polymerization in various solvents
Journal Article
·
· J. Appl. Polym. Sci.; (United States)
Thermal properties of polyethylenes prepared by ..gamma..-ray-induced polymerization in various solvents were examined by differential scanning calorimetry. The solvents used were ethyl and n-butyl alcohols, tert-butyl alcohol containing 25 vol % of water, 2,2,4-trimethylpentane, 2,2,5-trimethylhexane, and cyclohexane. The dependence of the profiles of the heating curves for the produced polymers on polymerization temperature varies with the solvent type. This difference was discussed in terms of the degree of undercooling in various solvents during polymerization. In all solvent systems, the melting point and heat of fusion of the polymers decrease continuously with polymerization temperature. This decrease is caused by an increase in branches with reaction temperature. The melting point and heat of fusion are 100 to 124/sup 0/C and 30 to 44 cal/g, respectively, and no superheating is observed. These facts suggest that folded chain crystals are commonly formed in these systems. 5 figures, 6 tables.
- Research Organization:
- Japan Atomic Energy Research Inst., Takasaki
- OSTI ID:
- 6485878
- Journal Information:
- J. Appl. Polym. Sci.; (United States), Journal Name: J. Appl. Polym. Sci.; (United States) Vol. 22:12; ISSN JAPNA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ALCOHOLS
ALKANES
ALKENES
BUTANOLS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHEMISTRY
COMPARATIVE EVALUATIONS
CYCLOALKANES
CYCLOHEXANE
ELECTROMAGNETIC RADIATION
ENTHALPY
ETHANOL
ETHYLENE
FUSION HEAT
GAMMA RADIATION
HYDROCARBONS
HYDROXY COMPOUNDS
IONIZING RADIATIONS
MEDIUM TEMPERATURE
MELTING POINTS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
ORGANIC SOLVENTS
PHYSICAL PROPERTIES
POLYETHYLENES
POLYMERIZATION
POLYMERS
POLYOLEFINS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
SOLVENT PROPERTIES
SOLVENTS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION HEAT
TRANSITION TEMPERATURE
YIELDS
400600* -- Radiation Chemistry
ALCOHOLS
ALKANES
ALKENES
BUTANOLS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHEMISTRY
COMPARATIVE EVALUATIONS
CYCLOALKANES
CYCLOHEXANE
ELECTROMAGNETIC RADIATION
ENTHALPY
ETHANOL
ETHYLENE
FUSION HEAT
GAMMA RADIATION
HYDROCARBONS
HYDROXY COMPOUNDS
IONIZING RADIATIONS
MEDIUM TEMPERATURE
MELTING POINTS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
ORGANIC SOLVENTS
PHYSICAL PROPERTIES
POLYETHYLENES
POLYMERIZATION
POLYMERS
POLYOLEFINS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
SOLVENT PROPERTIES
SOLVENTS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION HEAT
TRANSITION TEMPERATURE
YIELDS