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Abstract

Commercial PPTA fibers ( Kevlar 49® and Twaron 1055®) and copolyaramid fibers (Trevar®) are subjected to various hydrolytic and chemical treatments. Tensile mod ulus, tensile strength, and elongation at break are measured, and mechanical property deterioration is compared. Copolyaramid fibers show improved hydrolytic stability and chemical resistance compared to PPTA fibers. The time dependence of degradation pro cesses can be described by two decreasing exponential functions. WAXS measurements detect only slight differences in the crystalline structure and superstructure of the treated fibers. Thus, the main origin of mechanical degradation is the destruction of intercrys talline links such as tie molecules or tie crystallites.

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References

Auerbach, I. , Kinetics for the Tensile Strength Degradation of Nylon and Kevlar Yarns, J. Appl. Polym. Sci. 37, 2213-2227 (1989).

Bradley, W.L. , The Effect of the Moisture Absorption on the Interfacial Strength of Polymeric Matrix Composites, J. Mater. Sci. 30, 5537-5542 ( 1992).

Heinrich, K. , and Jung, H. , New Concepts in para-Aramid Fibers , Textile Res. J. 62 (12), 771-775 (1992).

Heintze, A. , Hochfeste Aramidfasern—ihre Eigenschaften und Anwendungsmöglichkeiten , Melliand Textilber. 67, 529-532 ( 1986).

Hindeleh, A.M. , and Abdo, Sh. M. , Relationship between Crystalline Structure and Mechanical Properties in Kevlar® 49 Fibres, Polym. Commun. 30, 184-186 (1989).

Hindeleh, A.M. , Halim, N.A. , and Ziq, K.A. , Solid-State Morphology and Mechanical Properties of Kevlar 29 Fiber, J. Macromol. Sci. Phys. B23 (3), 289-309 (1984).

Hindeleh, A.M. , Hosemann, R. , Hinrichsen , G. , and Springer, H. , Lateral Growth of Microparacrystals in Kevlar 49 Fibers Irradiated by Co60, J. Polym. Sci. Part B Polym. Phys. 28, 267-279 (1990).

Ozawa, S. , A. New Approach to High Modulus, High Tenacity Fibers, Polym. J. 19 (1), 119-125 (1987).

Wang, C.H. , and Chen, L.-W. , Preparation and Properties of Aramids Based on Naphthalenedicarboxylic Acid and their Molecular Composites with Amorphous Nylon, Angew. Makromol. Chem. 237, 173 -189 ( 1996).

10.

Wilfong, R.E. , and Zimmerman, J. , Strength and Durability of Kevlar Aramid Fiber, J. Appl. Polym. Sci. Appl. Polym. Symp. 31, 1-21 (1977).

11.

Yang, H.H. , "Kevlar Aramid Fiber," John Wiley & Sons, Chichester, U.K., 1993.

Influence of Hydrolytic and Chemical Treatment on the Mechanical Properties of Aramid and Copolyaramid Fibers

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