Multidimensional benzobisoxazole rigid-rod polymers. II. Processing, characterization, and morphology

✍ Scribed by D. R. Dean; D. M. Husband; M. Dotrong; C. S. Wang; M. H. Dotrong; W. E. Click; R. C. Evers

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 277 KB
• Volume: 35
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19971130)35:16<3457::aid-pola13>3.0.co;2-e

✦ Synopsis

A high-torque rheometer was used to facilitate the polycondensation of 4-[5-amino-6-hydroxybenzoxazol-2-yl]benzoic acid (ABA) with trimesic acid and 1,3,5,7tetrakis(4-carboxylatophenyl)adamantane to yield two-and three-dimensional benzobisoxazole polymers, respectively. Although the resultant polymer dopes exhibited improved homogeneity compared to polymer dopes previously prepared in glassware, improved polymer solution viscosities were not achieved. Fibers spun from the twoand three-dimensional polymers did not show a significant increase in compressive strength compared to fibers of the linear or one-dimensional benzobisoxazole polymer derived from the homopolymerization of ABA. Morphological studies of the polymer fibers and films by wide-angle X-ray scattering and scanning electron microscopy strongly indicated more lateral disorder and a more isotropic character for the threedimensional structures compared to the one-dimensional structures.