Kinetics of polymerization of diallyl phthalate (DAP) by gamma rays

Journal Article · Sat Feb 01 04:00:00 EST 1975 · J. Polymer Sci., Polym. Chem. Ed., v. 13, no. 2, pp. 295-308

DOI:https://doi.org/10.1002/pol.1975.170130203· OSTI ID:4179185

Divakar, D S; Rao, K

Diallyl o-phthalate (DAP) was polymerized by $gamma$ radiation from a $sup 60$Co source and the kinetics of polymerization were studied at several dose rates and temperatures. The results show that the rate of polymerization was proportional to I$sup 0$$.$$sup 68$, where I is the radiation dose rate. The net activation energy of the polymerization reaction (E/sub p/-1/2E/sub t/) was 5.02 kcal/mole, where E/sub p/ and E/sub t/ are the activation energies for the propagation and termination steps, respectively. The radical yield G/sub R/ for DAP was measured by the loss of diphenyl picryl hydrazyl (DPPH) used as a radical scavenger. G/sub R/ in the solution after irradiation was 3.12. The ratio of the rate constants k$sup 2$/sub p//k/sub t/ was calculated to be 4.09 x 10$sup - 7$ at 25.8$sup 0$C and 15.0 x 10$sup -7$ at 55.4$sup 0$C. At room temperature, the ratio of degradative chain transfer constant to k/sub p/, i.e., k/sub u//k/ sub p/ was found to be 0.065 and k/sub tr//k/sub u/ as 0.032, where k/sub tr/ is the nondegradative chain-transfer constant. Molecular weights of these polymers as determined by vapor pressure osmometry showed that the degree of polymerization was between 8 and 10. Infrared spectra of the polymers indicated that intramolecular cyclization took place during polymerization. (auth)

• Research Organization: Bhabha Atomic Research Center, Bombay
• Sponsoring Organization: USDOE
• NSA Number: NSA-33-005034
• OSTI ID: 4179185
• Journal Information: J. Polymer Sci., Polym. Chem. Ed., v. 13, no. 2, pp. 295-308, Journal Name: J. Polymer Sci., Polym. Chem. Ed., v. 13, no. 2, pp. 295-308; ISSN JPLCA
• Country of Publication: United States
• Language: English

Related Subjects

*PHTHALIC ACID ESTERS-- CHEMICAL RADIATION EFFECTS
400600* --Chemistry--Radiation Chemistry
CHEMICAL REACTION KINETICS
G VALUE
GAMMA RADIATION
INFRARED SPECTRA
MEDIUM TEMPERATURE
MOLECULAR WEIGHT
N40300* --Chemistry--Radiation Chemistry
POLYMERIZATION
POLYMERS
RADIATION DOSES
RADICALS
TEMPERATURE DEPENDENCE