Vinylferrocene was polymerized by means of anionic initiators such as n-BuLi, s-BuLi and distyryl disodium in tetrahydrofuran as solvent. In all cases the polymerization shows the characteristics of a living polymerization. Depending on the sequence of the monomer addition, either block copolymers o
2-Furyloxirane: 1. Anionic and coordination homo- and copolymerization
β Scribed by Hilmi Amri; Mohamed Naceur Belgacem; Alessandro Gandini
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 528 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0032-3861
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β¦ Synopsis
2-Furyloxirane (FO) was polymerized by various anionic and coordination initiators both in bulk and solution. The corresponding polyethers had relatively low DPns (up to about 100) and possessed relatively irregular structures arising from propagation reactions involving both Ca and C/3 oxirane ring opening, except when aluminium isopropoxide was used as catalyst. The glass transition temperature (Tg) of these polymers was always lower than room temperature and approached 15Β°C for the highest molecular weight. Propylene oxide did not copolymerize with FO, whereas butylene oxide gave copolymers, but the reactivity of FO remained much higher and the products were therefore rich in this comonomer unit.
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A stereospecific synthesis of trans-l-cyanobutadiene is described. This monomer was polymerized by n-butyl lithium in toluene and in tetrahydrofuran to yield sparingly soluble products. In both solvents, the concatenation was predominatly trans-l,4with a little eis-l,4 and 3,4 content. Copolymers w
## Abstract Macromonomers have been extensively used, as well defined building blocks for various macromolecular architectures via anionic, ROMP and free radical homoβ or copolymerization processes. The purpose of the present work was to examine the homopolymerization and copolymerization of __Ο__β