| Autor: |
de Ruijter, Christiaan, F. Jager, Wolter, Groenewold, Jan, J. Picken, Stephen |
| Zdroj: |
Macromolecules; May 2006, Vol. 39 Issue: 11 p3824-3829, 6p |
| Abstrakt: |
A series of block copolymers that contain rigid liquid crystal forming blocks of poly(p-phenylene terephthalamide) (PPTA) and flexible blocks of hexamethylene adipamide (PA 6,6) have been synthesized. The polymers have been prepared in a one-pot procedure by addition of PA 6,6 monomers to an amine-terminated PPTA oligomer via a low-temperature polycondensation reaction in N-methyl-2-pyrrolidone. Via this method block copolymers are formed that were characterized by inherent viscosity measurements, size exclusion chromatography (SEC), NMR, Soxhlet extraction, and TGA. The molecular weights of the synthesized rod−coil block copolymer materials are estimated from their intrinsic viscosities by a semiempirical model that combines both the intrinsic viscosity relations of the homopolymers and the mean-square end-to-end distance of the rod−coil copolymer. |
| Databáze: |
Supplemental Index |
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