Cationic polymerization of β-pinene with the AlCl3/SbCl3 binary catalyst: Comparison with α-pinene polymerization

✍ Scribed by Jiang Lu; Masami Kamigaito; Mitsuo Sawamoto; Toshinobu Higashimura; Yun-Xiang Deng

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 410 KB
• Volume: 61
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19960808)61:6<1011::aid-app15>3.0.co;2-z

✦ Synopsis

The polymerization of P-pinene with the A1Cl3/SbCl3 binary catalyst was investigated in toluene a t -40°C and was compared with that of a-pinene. The polymerization of P-pinene with AlC13 alone was very rapid and retarded on addition of SbC13, in sharp contrast to that of a-pinene where added SbC13 remarkably accelerated it to give relatively high molecular weight oligomers. Attempted copolymerization of the two isomers with the binary catalyst, in turn, induced their parallel homopolymerizations, indicating that the copolymerization was difficult due to the large difference in reactivity. The homopolymerizations with A1CI3/SbCl3 were not seriously affected by a sterically hindered base, 2,6-di-tert-butyl-4-methylpyridine (DTBMP); the initiating species, therefore, would be different in nature from a proton.