4.2 阴离子聚合.pdf

1 CH 3 H C C 2 CH 3 SnCl4 + RCl St Na + 2 3 5. Mechanism of polymerization (1) Initiation a. Mechanism b. Number of carbanion Electron transfer Dicarbanion Electron addition Single carbanion c. Solubility d. Activation energy Dissolve only in polar solvents 10 kJ/mol Dissolve in nonpolar solvents Fast initiation! 4.2 4 5 Living polymerization 1 2 MMA ) 3 a. Rp = kp [ M¯ ][ M ] b.