EPR STUDY OF THE RADIATION VULCANIZATION OF RUBBER IN THE PRESENCE OF SULFUR AND HEXACHLOROETHANE

Journal Article · Mon Jan 01 04:00:00 EST 1962 · Vysokomolekul. Soedin.

OSTI ID:4749709

Tarasova, Z N; Fogel'son, M S; Kozlov, V T; Kashlinskii, A I; Kaplunov, M Ya; Dogadkin, B A

Recorded epr spectra were used to study the formation of free radicals during the radiation polymerization of natural rubber (NR) and mixtures of NR with 2 wt% sulfur or 10 wt % C/sub 2/Cl/sub 6/. Irradiation was conducted at -- 196 to 20 deg C with Co/sup 60/ at a dose of 6 to 11 Mr with the following results: long-lived radicals with an initial concentration of (1 to 2.5) x 10/sup 14/ mg/sup -1/ formed in NR and its mixtures with S or C/sub 2/Cl/sub 6/ at 20 deg C and 6 to 8 Mr; radicals of different lives formed with irradiation at -196 deg C. (Their initial concentrations in NR, NR + C/sub 2/Cl/sub 6/ and in NR + S were (4.9 plus or minus 0.7) x 10/sup 15/ mg/sup -1/, (11 plus or minus 2) x 10/sup 15/ mg/sup -1/, and (2.6 plus or minus 0.6) x 1 0/sup 15/ mg/sup -1/ respectively.) If the NR + C/sub 2/Cl/sub 6/ sample irradiated at --196 deg C was slowly brought to room temperature, structuration occurred near the vitrification temperature (--70 deg C); gradual heating of the NR + S sample yielded new short- lived radicals with a g factor typical of S radicals; after irradiation, crystalline C/sub 2/Cl/sub 6/ showed an intensive epr signal (the formation of CCl/sub 3/ radicals was confirmed by the analytical detection of chloroform); structuration of NR irradiated at low temperatures was supported by C/sub 2/Cl/ sub 6/ and impeded by S, which increased the static strength of the radiation vulcanizate; and crystalline S showed only a weak epr signal. (P.C.H.)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-17-014922
• OSTI ID: 4749709
• Journal Information: Vysokomolekul. Soedin., Journal Name: Vysokomolekul. Soedin. Vol. Vol: 4
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CARBON TETRACHLORIDE
COBALT 60
CRYSTALLIZATION
ETHANE
HYDROCARBONS
LOW TEMPERATURE
METALS, CERAMICS, AND OTHER MATERIALS
POLYMERIZATION
RADIATION DOSES
RADIATION EFFECTS
RUBBER
SPECTRA
SULFUR
TEMPERATURE
VULCANIZATION