Vinyl polymerization, 298. Polymerization of methyl methacrylate initiated by 4‐cyano‐1‐phenyl‐4,5‐dihyro‐1<i>H</i>‐<i>v</i>‐triazole
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<jats:title>Abstract</jats:title><jats:p>Using 4‐cyano‐1‐phenyl‐4,5‐dihydro‐1<jats:italic>H</jats:italic>‐<jats:italic>v</jats:italic>‐triazole (<jats:bold>1</jats:bold>) as initiator, the polymerization of methyl methacrylate (MMA) in benzene solution was performed at 75°C. The initial rate of polymerization was proportional to [<jats:bold>1</jats:bold>]<jats:sup>0,43</jats:sup> and [MMA]<jats:sup>1,27</jats:sup>. The polymerization proceeded by a radical mechanism. The overall activation energy for the polymerization was 71,8 kJ mol<jats:sup>−1</jats:sup> (at 65–85°C). The chain‐transfer constant of <jats:bold>1</jats:bold> for MMA was estimated as 0,0 at 75°C. The rate of thermal decomposition of <jats:bold>1</jats:bold> was also measured and the following rate equation was obtained: <jats:italic>k</jats:italic><jats:sub>d</jats:sub> = 6,79 · 10<jats:sup>14</jats:sup> exp (−121/<jats:italic>RT</jats:italic>) s<jats:sup>−1</jats:sup> (<jats:italic>E</jats:italic> in kJ) (at 60–80°C). Based upon the experimental evidence, a mechanism is discussed for the initiation of the polymerization.</jats:p>
収録刊行物
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- Die Makromolekulare Chemie
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Die Makromolekulare Chemie 172 127-134, 1973-11-07
Wiley