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Living Anionic Polymerization of N ‐Methacryloyl‐2‐methylaziridine
Author(s) -
Ishizone Takashi,
Kusakabe Junichi,
Suzuki Takashi
Publication year - 2009
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.200950504
Subject(s) - polymerization , monomer , polymer chemistry , anionic addition polymerization , moiety , polymer , chemistry , solution polymerization , molar mass distribution , living anionic polymerization , organic chemistry
Anionic polymerization of N ‐methacryloyl‐2‐methylaziridine ( 1 ) proceeded with 1,1‐diphenyl‐3‐methylpentyllithium (DMPLi) in the presence of LiCl or Et 2 Zn to give the polymers possessing predicted molecular weights and narrow molecular weight distributions ( M w / M n < 1.1) at −78 ∼ −40 °C in THF. In each polymerization initiated with DMPLi/LiCl at the various temperatures ranging from −40 to −60 °C, the linear relationship between polymerization time and conversion of monomer was obtained from the GLC analysis. The rate constant and the activation energy of the anionic polymerization for 1 were determined as follows: ln k p ap = −5.85 × 10 3 /T + 23.3 L mol −1 s −1 and 49 ± 4 kJ mol −1 , respectively. Poly( 1 ) showed the glass transition temperature at 98 °C, and gave the insoluble product at higher temperature around 150 °C through the thermal cross‐linking of highly strained N ‐acyl‐aziridine moiety.