Polymerization of aliphatic disubstituted acetylenes by MoOCl4–n-Bu4Sn–EtOH catalyst: Formation of polymers with narrow MWDs and confirmation of the living character
✍ Scribed by Hideki Kubo; Shigetaka Hayano; Toshio Masuda
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 119 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0887-624X
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✦ Synopsis
The polymerization of aliphatic disubstituted acetylenes was examined with MoOCl 4 -n-Bu 4 Sn-EtOH (1/1/2) ternary catalyst in anisole at 0 °C. Various linear aliphatic disubstituted acetylenes such as 2-nonyne provided polymers with narrow molecular weight distributions (weight-average molecular weight/number-average molecular weight ϭ 1.05-1.20). The living character of the polymerization was proven by both the time profile of the polymerization and the multistage polymerization of 2-nonyne. The initiation efficiency was about 3%, which is rather low. Although 5-dodecyne, which has a triple bond in a more inner part, polymerized more slowly than 2-nonyne, their living characters were hardly different. Diblock copolymers were synthesized by the sequential living polymerization of internal linear alkynes.