Synthesis of polymorpholine-2,5-dione-block-polylactide by two-step anionic ring-opening polymerization
✍ Scribed by Li Yongzhen; He Jidong; Cui Guozhen; He Weina; Peng Zheng
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 298 KB
- Volume
- 118
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
Abstract
Polymorpholine‐2,5‐dione‐block‐polylactide (PMD‐b‐PLA) was synthesized via two‐step anionic ring‐opening polymerization at room temperature. First step of ring‐opening polymerization was the ring‐opening of morpholine‐2,5‐dione (MD). It was carried out in an airtight and dry polymerization tube using potassium ethoxide/THF (0.2__M__/L) as an initiator for 90 min. Then lactide was ring‐opened in THF solution by the potassium alcoholate of PMD. From the FTIR of the copolymer, we can find all the peaks in PLA and PMD. The ^1^H‐NMR of copolymer gave us a proof to the principle of the anionic ring‐opening polymerization and the fraction of PMD in the copolymer was calculated as 86.3%. DSC analysis of copolymer indicated that it was a copolymer with one T~g~ (63.6°C) and two __T~m~__s (155.6 and 171.4°C) instead of a mixture of PMD and PLA. The yields of the PMD and the copolymer were 32 and 26%, respectively. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010