## Abstract The direct enzymatic synthesis of a cyclic trimethylene carbonate (1,3βdioxaneβ2βone) monomer with/without a methyl substituent was carried out using dimethyl or diethyl carbonate and 1,3βdiol with the objective of producing aliphatic poly(trimethylene carbonate), a typical biodegradabl
Cyclic carbonates, novel expandable monomers on polymerization
β Scribed by Toshikazu Takata; Fumio Sanda; Toshiro Ariga; Hideo Nemoto; Takeshi Endo
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 445 KB
- Volume
- 18
- Category
- Article
- ISSN
- 1022-1336
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β¦ Synopsis
Abstract
A variety of cyclic carbonates was shown to undergo volume expansion on polymerization. The degree of volume expansion, which was measured by the density gradient tube method, was ranging from 1.1% to 7.7%. The volume expansion was examined by assuming a change in molecular interaction such as dipole moment between monomer and polymer states.
π SIMILAR VOLUMES
The anionic ring-opening polymerization of six-membered cyclic carbonates having aromatic substituents, 5-methyl-5-phenyl-l,3-dioxan-2-one (1) and 5,5-diphenyl-1,3-dioxan-2-one (2), was carried out. The anionic homopolymerization of 1 readily proceeds to afford the corresponding polycarbonate, while
## Abstract A spiro orthocarbonate containing two cyclohexyl groups, 8,10,19,20βtetraoxatrispiro[5.2.2.5.2.2]heneicosane (**1**), was prepared. The monomer was polymerized with Lewis acids such as boron trifluoride etherate or stannic chloride as catalysts. The IR and NMR spectra indicated that the