Vinyl polymerization. 361. Polymerization of 2,2,4-trimethyl-3-on-1-pentyl methacrylate |
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Authors: | Tatsuro Ouchi Yoshitaka Arita Minoru Imoto |
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Abstract: | 2,2,4-Trimethyl-3-on-1-pentyl methacrylate (TMPM) was first synthesized from the condensation reaction of 2,2,4-trimethyl-1-pentanol-3-on with methacrylic acid. Second, the polymerization of TMPM and the copolymerization of TMPM with styrene (St) were carried out in benzene at 60°C, using 2,2′-azobisisobutyronitrile (AIBN) as an initiator. As the result of kinetic investigation, the rate of polymerization (Rp) could be expressed by: Rp = k[AIBN]0.5 [TMPM]1.0. Kinetic constants of polymerization of TMPM were obtained as follows: kp/k = 0.27 dm3/2 mole?1/2 sec?1/2, 2fkd = 1.23 × 10?5 sec?1, f = 0.73, Cm = 2.6 × 10?5, Cs = 1.1 × 10?5. From the results the reactivity of TMPM was found to be larger than that of methyl methacrylate. The overall activation energy was calculated to be 110 kJ mole?1. The following monomer reactivity ratios and Q, e values were obtained: TMPM(M1) ? St(M2): r1 = 1.50, r2 = 0.14, Q1 = 2.63, E1 = 0.45. |
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