Molecular composites of poly(p-phenylene terephthalamide) anion and poly(ethylene oxide): Thermal behavior and morphology

✍ Scribed by L. Tsou; J. A. Sauer; M. Hara

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 277 KB
• Volume: 38
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/(sici)1099-0488(20000515)38:10<1369::aid-polb140>3.0.co;2-9

✦ Synopsis

Molecular composites, in which a small concentration of ionically modified poly(p-phenylene terephthalamide) (PPTA) is dispersed in a poly(ethylene oxide) matrix, have been prepared. With the content of PPTA anion increasing to about 5 wt %, the glass-transition temperature rises and the melting temperature decreases. From the equilibrium-melting-temperature depression data that were obtained from Hoffman-Weeks plots, the Flory-Huggins interaction parameter was determined to be negative (Ϫ1.10). These indications of enhanced miscibility between the components are attributed to intermolecular ion-dipole interactions. The presence of rigid PPTAanion reinforcement alters the morphology; for example, the spherulite size is reduced, and the degree of crystallinity is lowered. Possible models of how the reinforcement is incorporated into the composite are presented.