Tong Li, A. Padías, H. K. Hall
Sep 1, 1992
Citations
0
Influential Citations
7
Citations
Journal
Macromolecules
Abstract
Ethyl 1-cyano-2-(p-methoxyphenyl)cyclopropanecarboxylate (ECMC) initiates the cationic polymerization of N-vinylcarbazole (VCZ) in 1,2-dichloroethane solution at temperatures above 60°C. The experimental kinetic equation is R p ∞ [VCZ] 1.5 [ECMC] 0.9 and the apparent activation energy is 20.3 kcal/mol. The obtained polymer shows a bimodal molecular weight distribution, which is attributed to free-ion vs ion-pair propagation. The factors favoring free-ion propagation include lower conversion, lower temperature, lower monomer concentration, highre initiator concentration and more polar solvents