Pulse radiolysis study on the initial processes of radiation-induced catonic polymerization of styrene and methylstyrene

Journal Article · Sat Apr 01 04:00:00 EST 1978 · J. Polym. Sci., Polym. Chem. Ed.; (United States)

DOI:https://doi.org/10.1002/pol.1978.170160402· OSTI ID:6740689

Egusa, S ^[1]; Tabata, Y; Arai, S; Kira, A; Imamura, M

---

1. Tokyo Univ.

Initial processes of radiation-induced cationic polymerization of styrene and ..cap alpha..-methylstyrene have been studied by means of microsecond pulse radiolysis. For styrene, absorption bands caused by the monomer cation radical St/sup +/. appear at 630 and 350 nm in a mixture of isopentane and n-butyl chloride at about -165/sup 0/C. In parallel with the decay of St/sup +/., three absorption bands appear in the near-infrared (ir) region, and at 600 and 450 nm. The ir and 600 nm bands are assigned to the associated dimer cation radical St/sub 2//sup +/., and the 450 nm band to the bonded dimer cation radical St-St/sup +/.. The kinetic behavior of these species shows that reaction of St/sup +/. with styrene monomer forms both St/sub 2//sup +/. and St-St/sup +/.. With the decay of St-St/sup +/., another absorption band appears at 340 nm, and the lifetime of this band is relatively long. The 340 nm band may be due to carbonium ions of the growing polystyrene. For ..cap alpha..-methylstyrene, the monomer cation radical (at 690 and 350 nm), the associated dimer cation radical (in the near-ir region and at 620 nm) and the bonded dimer cation radical (at 480 nm) behave in a manner similar to that of the corresponding styrene species. The absorption band caused by carbonium ions of growing poly(..cap alpha..-methylstyrene) appears at 340 nm. 9 figures.

• OSTI ID: 6740689
• Journal Information: J. Polym. Sci., Polym. Chem. Ed.; (United States), Journal Name: J. Polym. Sci., Polym. Chem. Ed.; (United States) Vol. 16:4; ISSN JPLCA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ABSORPTION SPECTRA
AROMATICS
CATIONS
CHARGED PARTICLES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
HYDROCARBONS
IONS
IRRADIATION
KINETICS
ORGANIC COMPOUNDS
POLYMERIZATION
PULSED IRRADIATION
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
REACTION KINETICS
SPECTRA
STYRENE