High-Molecular-Weight Polycarbonates Synthesized by Enzymatic ROP of a Cyclic Carbonate as a Green Process
✍ Scribed by Yoshio Yamamoto; Sachiko Kaihara; Kazunobu Toshima; Shuichi Matsumura
- Book ID
- 102474260
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 379 KB
- Volume
- 9
- Category
- Article
- ISSN
- 1616-5187
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✦ Synopsis
Abstract
High‐molecular‐weight PTeMC and PHMC were prepared by the lipase‐catalyzed polymerization of butane‐1,4‐diol or hexane‐1,6‐diol and diphenyl carbonate via the formation of a cyclic dimer by a green process. Cyclic carbonate dimers were prepared by the lipase‐catalyzed condensation of diphenyl carbonate with butane‐1,4‐diol or hexane‐1,6‐diol in dilute toluene solution using an immobilized lipase from Candida antarctica, and was followed by the ring‐opening polymerization of the cyclic dimer in bulk with the same lipase to produce PTeMC with $\overline M _{\rm w}$ = 119 000 g · mol^−1^ and PHMC with $\overline M _{\rm w}$ = 399 000 g · mol^−1^, respectively. Additionally, enzymatic polymerization of cyclic carbonate dimer was analyzed with respect to the K~m~ and V~max~ for the lipase.
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