Effects of copolymer composition on the formation of ionic species, hydrogen evolution, and free-radical reaction in el-irradiated styrene-butadiene random and block copolymers

Journal Article · Sun Jan 01 04:00:00 EST 1984 · J. Polym. Sci., Polym. Phys. Ed.; (United States)

DOI:https://doi.org/10.1002/pol.1984.180220714· OSTI ID:6302866

Basheer, R; Dole, M

Block and random copolymers of butadiene and styrene as well as polybutadiene and polystyrene homopolymers have been investigated with respect to formation of trapped electrons, contribution of ionic species to crosslinking, and hydrogen gas evolution due to el radiation. The decay kinetics of the disubstituted benzyl radical has also been studied. The yields of electron trapping G(e ) are measured. The G(e ) increase linearly with increased polystyrene content in block polymers, while in random copolymer a deviation from a linear relation is observed. The contribution of ionic reactions to crosslinking is about 25-35% of the total crosslinking yield. Hydrogen production in block copolymers is approximately a linear function of the weight-fraction additivity of the yield of hydrogen formation in polystrene and polybutadiene homopolymers. Energy transfer from butadiene units to styrene units in random copolymers resulted in a deviation from such an additivity relation. The decay of the disubstituted benzyl free radical in block copolymers is a second-order reaction. In random copolymer, the decay is best interpreted in terms of equation based on a second-order decay mechanism of a fraction of the free radicals decaying in the presence of other nondecaying free radicals. 24 references, 11 figures, 3 tables.

• Research Organization: Univ. of Notre Dame, IN
• OSTI ID: 6302866
• Journal Information: J. Polym. Sci., Polym. Phys. Ed.; (United States), Journal Name: J. Polym. Sci., Polym. Phys. Ed.; (United States) Vol. 22; ISSN JPLPA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ALKYLATED AROMATICS
AROMATICS
BUTADIENE
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
COPOLYMERS
CROSS-LINKING
DATA
DIENES
ELECTROMAGNETIC RADIATION
EXPERIMENTAL DATA
GAMMA RADIATION
HYDROCARBONS
HYDROGEN PRODUCTION
INFORMATION
IONIZING RADIATIONS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYENES
POLYMERIZATION
POLYMERS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
STYRENE