Long-Spaced Polyamides: Elucidating the Gap between Polyethylene Crystallinity and Hydrogen Bonding
| Autor: | Tobias Lemke, Stefan Mecking, Patrick Ortmann |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Condensation polymer Polymers and Plastics Organic Chemistry Polyethylene Inorganic Chemistry Linear low-density polyethylene chemistry.chemical_compound chemistry Polymerization Amide Polymer chemistry Polyamide Materials Chemistry Copolymer Organic chemistry Acyclic diene metathesis |
| Zdroj: | Macromolecules. 48:1463-1472 |
| ISSN: | 1520-5835 0024-9297 |
| Popis: | Aliphatic polyamides with so far inaccessibly low amide contents were prepared by acyclic diene metathesis (ADMET) copolymerization of N-(undec-10-en-1-yl)undec-10-enamide (1) and undeca-1,10-diene (2) applying different Grubbs and Hoveyda–Grubbs type olefin metathesis catalyst precursors, followed by exhaustive postpolymerization hydrogenation to yield saturated copolymers. These polyamides, containing between 1.0 and ca. 50.5 amide groups per 1000 methylene units, fill the gap between polyamides from classical polymerization approaches, like polycondensation of diamines with diacids, and linear polyethylene. With reduced amide concentrations the melting points of polyamides converge toward polyethylene, passing through a distinct melting point minimum observed around 110 °C for polyamides with ca. 35 amide groups per 1000 methylene units. The minimum goes in hand with a change in the crystal structure related to the different ratios of intersegment interactions from hydrogen bonding and nonpolar van der... |
| Databáze: | OpenAIRE |
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