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Anionic Polymerization Behavior of α‐Methylene‐ N ‐methylpyrrolidone
Author(s) -
Ishizone Takashi,
Kitazawa Keita,
Suzuki Takashi,
Kawauchi Susumu
Publication year - 2013
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201100095
Subject(s) - polymerization , monomer , polymer chemistry , methylene , anionic addition polymerization , polymer , molar mass , chemistry , chain transfer , cationic polymerization , activation energy , solution polymerization , molar mass distribution , materials science , radical polymerization , medicinal chemistry , organic chemistry
Anionic polymerization of α‐methylene‐ N ‐methylpyrrolidone ( MMP ) was carried out in THF at −78∼0 °C with diphenylmethylpotassium (Ph 2 CHK) and with diphenylmethyllithium (Ph 2 CHLi) in the presence of Lewis acidic diethylzinc (Et 2 Zn). Poly( MMP )s possessing predicted molecular weights based on the molar ratios between monomer and initiators and narrow molecular weight distributions ( M w / M n < 1.1) were obtained in quantitative yields. It was demonstrated that the propagating chain end of poly( MMP ) was stable at −30 °C to form the polymers with well‐defined chain structures. From the polymerizations at the various temperatures ranging from −50 to −30 °C, the apparent rate constant and the activation energy of the polymerization were estimated as follows: ln k p ap = −6.93 × 10 3 /T + 25.7 and 57 ± 5 kJ mol −1 , respectively.