Radiation-induced polymerization at high dose rate. IV. Chloroprene in bulk

Journal Article · Sat Nov 01 04:00:00 EST 1980 · J. Polym. Sci., Polym. Chem. Ed.; (United States)

DOI:https://doi.org/10.1002/pol.1980.170181115· OSTI ID:6676043

Hayashi, K; Tachibana, M; Okamura, S

Bulk polymerization of chloroprene was studied at 25/sup 0/C in a wide dose rate range. Variations of the rate of polymerization (R/sub p/) and molecular weight as a function of dose rate were essentially the same as those in several monomers that are capable of radical and cationic polymerizations. The polymerization proceeds with radical mechanism at low dose rate and with radical and cationic mechanism concurrently at high dose rate. The number-average molecular weight of the high-dose-rate products was ca. 2400. Microstructure of the polymers was mainly of trans-1,4 unit with small fractions of cis-1,4 and 3,4-vinyl unit. Fractions of the vinyl unit and the inverted unit in trans-1,4 sequence which increased at high dose rate reflected the change of dominant mechanism of polymerization. 6 figures, 2 tables.

• Research Organization: Japan Atomic Energy Research Inst., Neyagawa City, Osaka
• OSTI ID: 6676043
• Journal Information: J. Polym. Sci., Polym. Chem. Ed.; (United States), Journal Name: J. Polym. Sci., Polym. Chem. Ed.; (United States) Vol. 18:11; ISSN JPLCA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360406* -- Materials-- Polymers & Plastics-- Radiation Effects-- (-1987)
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
CHLORINATED ALIPHATIC HYDROCARBONS
ELASTOMERS
HALOGENATED ALIPHATIC HYDROCARBONS
MEDIUM TEMPERATURE
MOLECULAR WEIGHT
NEOPRENE
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
POLYMERIZATION
POLYMERS
RADIATION CHEMISTRY
RADIATION EFFECTS