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BF3·OEt2-initiated polymerization of 2-methylene-1,3-dioxepanes

✍ Scribed by Zhihong Wu; Charles U. Pittman JR.

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
213 KB
Volume
36
Category
Article
ISSN
0887-624X

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✦ Synopsis

BF 3 rOEt 2 -initiated polymerizations of 2-methylene-1,3-dioxepane gave polymers composed of both ring-retained and ring-opened structures. The ring-opening content increased with an increase in polymerization temperature. Poly(4,7-dimethyl-2-methylene-1,3-dioxepane) propagated slower during BF 3 rOEt 2 -initiated polymerization and had a lower ring-opened content than poly(2-methylene-1,3-dioxepane). The type of acid initiator used also affected the amount of ring opening observed. Stronger acids gave less ring opening. Attempted BF 3 rOEt 2 -initiated copolymerizations of these seven-membered ring cyclic ketene acetals with isobutyl vinyl ether at room temperature resulted in formation of the two homopolymers.

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