Molecular weight distribution of polyamides obtained in anionic polymerization of methyl-substituted β-lactams and aminolysis of their N-benzoyl lactams
✍ Scribed by Kazuhiko Hashimoto; Takashi Oi; Jun Yasuda; Koji Hotta; Masahiko Okada
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 177 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0887-624X
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✦ Synopsis
The anionic ring-opening polymerization of 3-methyl-2-azetidinone ( 3) in a mixture of N,N-dimethylacetamide with lithium chloride proceeded quantitatively in a homogeneous phase at 25ЊC, as well as the living anionic polymerization of 3,3dimethyl-, 4,4-dimethyl-2-azetidinone ( 1 and 2, respectively) in a similar condition. However, the molecular weight dispersion of the polyamide obtained from 3 was found to be higher than that obtained from 1 and 2. The aminolysis reaction of their Nbenzoyllactams and N-acyllactams corresponding to their growing species with benzylamine was investigated kinetically, and one of the reasons for broadening of the molecular weight distribution of the polyamide obtained in the anionic polymerization of 3 was speculated to result from a low value of the ratio of the initiation reaction constant to the propagation one.