Solid-state polymerization of long-chain vinyl compounds. III. Mechanism of. gamma. -ray-initiated postpolymerization in layered structures of octadecyl methacrylate and acrylate

Journal Article · Sun Jun 01 04:00:00 EDT 1980 · J. Polym. Sci., Polym. Chem. Ed.; (United States)

DOI:https://doi.org/10.1002/pol.1980.170180605· OSTI ID:5130001

Shibasaki, Y

The mechanism and kinetics of the ..gamma..-ray-initiated postpolymerization of octadecyl methacrylate and acrylate in lamellar crystals were investigated by a simple model. This model assumes that the initiation points are distributed as in a checkerboard and that polymerization probability of the monomer molecules decreases conically around each initiation point. The two-dimensional polymerization can be characterized in this cone model by two parameters, a and r; a represents the polymerizability of the monomer for a given condition, and r depends on the number of initiation points per unit area. G values for the initiation reaction of octadecyl methacrylate and acrylate were estimated as 0.8 and 1.6, respectively. The two-dimensional postpolymerization of long-chain compounds proceeds in two stages. The rate of polymerization is very high and zero order with respect to monomer concentration in the first stage. It is lower and obeys first-order kinetics in the second stage. The rate constants of the zero- and first-order polymerizations were k/sub p0/ = 1.73 molecule sec/sup -1/ and k/sub p1/ = 0.93 sec/sup -1/, respectively, for octadecyl acrylate at 20/sup 0/C.

• Research Organization: Saitama Univ., Urawa, Japan
• OSTI ID: 5130001
• Journal Information: J. Polym. Sci., Polym. Chem. Ed.; (United States), Journal Name: J. Polym. Sci., Polym. Chem. Ed.; (United States) Vol. 18:6; ISSN JPLCA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ACRYLIC ACID ESTERS
CARBOXYLIC ACID ESTERS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
CRYSTALS
ELECTROMAGNETIC RADIATION
ESTERS
G VALUE
GAMMA RADIATION
IONIZING RADIATIONS
KINETICS
LAMELLAE
METHACRYLIC ACID ESTERS
ORGANIC COMPOUNDS
POLYMERIZATION
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
REACTION KINETICS