gamma. -radiation-induced telomerization of vinyl acetate, styrene, and methyl methacrylate
Vinyl acetate (VAc), styrene (St), and methyl methacrylate (MMA) were irradiated in dilute solution at an absorbed dose rate of 0.5 Mrad/h in the absence of oxygen at room temperature. In homogeneous systems, telomers are formed with a rate proportional to (M)/sup 1/ at monomer concentrations (M) > ca. 0.4M. The chain length (anti D.P./sub n/) increases with increasing (M). (anti D.P./sub n/)/sup -1/ depends over large ranges of (M) linearly on the ratio (S)/(M) (S = solvent) in accordance with the Mayo equation. These findings were obtained with VAc in methanol and with St in cyclohexane. In heterogeneous systems, telomer if formed at all monomer concentrations. The 100-eV yield for telomer formation passes a maximum of G/sub T/(-M) = 40 (MMA in 2-propanol) and G/sub T/(-M) = 27 (MMA in cyclohexane) at the onset of polymer formation ((M) approx. = 3 vol-%). With the system St/2-propanol, G/sub T/(-M) approx. = 15 was found being independent of (M). The molecular weight anti M/sub n//(telomer) increased from ca. 600 to ca. 1200 by increasing (M) up to 100 vol % (MMA/2-propanol). anti M/sub n/(telomer) does not depend on (M) in the other two cases (anti M/sub n/ approx. = 500, MMA/cyclohexane; anti M/sub n/ approx. = 700, St/2-propanol).
- Research Organization:
- Hahn-Meitner-Institut fuer Kernforschung, Berlin, Germany
- OSTI ID:
- 6213887
- Journal Information:
- J. Appl. Polym. Sci.; (United States), Vol. 23:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ACETIC ACID ESTERS
CHEMICAL RADIATION EFFECTS
METHYL METHACRYLATE
STYRENE
VINYL MONOMERS
CYCLOHEXANE
GAMMA RADIATION
METHANOL
POLYMERIZATION
ALCOHOLS
ALKANES
AROMATICS
CARBOXYLIC ACID ESTERS
CHEMICAL REACTIONS
CHEMISTRY
CYCLOALKANES
ELECTROMAGNETIC RADIATION
ESTERS
HYDROCARBONS
HYDROXY COMPOUNDS
IONIZING RADIATIONS
METHACRYLIC ACID ESTERS
MONOMERS
ORGANIC COMPOUNDS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
400600* - Radiation Chemistry