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Anionic ring-opening polymerization behavior of a seven-membered cyclic carbonate; 1, 3-dioxepan-2-one

✍ Scribed by Jyuhou Matsuo; Fumio Sanda; Takeshi Endo

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
155 KB
Volume
35
Category
Article
ISSN
0887-624X

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✦ Synopsis

Anionic ring-opening polymerization of a seven-membered cyclic carbonate, 1,3-dioxepan-2-one ( 1), was carried out to observe that the higher the polymerization temperature and lower the initial monomer concentration were, the lower the yield and molecular weight, and wider the molecular weight distribution of the obtained polymers were. The back-biting reaction and the formation of cyclic oligomers of 1 were observed during the polymerization of 1. The relative polymerization rate of 1 was about 35 times faster than that of six-membered carbonate, 1,3-dioxan-2-one ( 3). The DHps of 1 and 3 estimated by MO (PM3) calculations were 09.8 and 04.4 kcal/mol, respectively. 1 could easily undergo the ring-opening polymerization based on larger ring strain.

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