Multifunctional Coupling Agents: 3. Segmented Block Copolymers Based on Carboxy-Terminated Poly(propylene oxide) and Amino-Terminated Polyamide 12
✍ Scribed by Bui T. Dung; Lothar Jakisch; Hartmut Komber; Liane Häußler; Brigitte Voit; Nguyen D. Nghia; Frank Böhme
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 290 KB
- Volume
- 207
- Category
- Article
- ISSN
- 1022-1352
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
Summary: Segmented block copolymers were synthesized in melt by conversion of carboxy‐terminated poly(propylene oxide) and amino‐terminated PA12 with a selectively reacting bifunctional coupling agent bearing one oxazoline and one oxazinone group. The reaction was performed either in one or two steps. In the latter, it could be shown that the sequence of mixing significantly influenced the course of reaction. The structure of the linking group formed during the reaction was verified by ^1^H NMR spectroscopy using model compounds. DSC and TEM investigations evidenced that the block copolymers are phase separated. Domains in a size of several nanometers are found. Owing to the two phase structure, the block copolymers show ductile behavior with the tendency to elastomeric behavior. Tensile properties of the block copolymers increase with the content of PA12. Elongations at break were measured with values up to 500%.
TEM micrograph of block copolymer 6b.
magnified imageTEM micrograph of block copolymer 6b.