Accession Number : AD0488535

Title :   DESIGN, FABRICATION AND CHARACTERIZATION OF OPTIMUM FIBROUS STRUCTURES OF POLYBENZIMIDAZONE YARN.

Descriptive Note : Final technical rept. Apr 65-Apr 66,

Corporate Author : CELANESE CORP OF AMERICA NEW YORK

Personal Author(s) : Livingston, M. R. ; Gaddie, D. W. ; Gilland, J. I.

Report Date : JUN 1966

Pagination or Media Count : 57

Abstract : A limited study was made to characterize the effects of parametric variations in construction on the mechanical performance of various parachute items made from polybenzimidazole (PBI) yarns. The results indicate that most of the specifications originally written for nylon parachute components can be met with PBI if suitable modifications are made in construction to allow for the lower tenacity of PBI yarn. Strength translation efficiencies are good enough to permit prediction of breaking loads of structures with reasonable accuracy on the basis of one pound per 100 deniers of yarn used. Sufficient amounts of each required end item were made to permit complete laboratory characterization including testing at ambient, 350 F, 450 F, 700 F, 900 F, and 1000 F after exposures ranging from 0 to 200 hours. Only the threads and one fabric were tested over the specified range when it became apparent that finish modifications would be required before reliable results could be obtained from high temperature testing. An investigation was made of the high temperature resistance of available candidate finishes and finish components applied to PBI fabric and yarn by various methods. While no satisfactory material was found, some leads were developed which may be useful in further studies. The testing done on the threads and lightweight fabric showed that PBI yarn structures retain about 40% of their original strength after exposure at 700 F for two hours, even with an unsatisfactory finish.

Descriptors :   (*PARACHUTE FABRICS, BENZIMIDAZOLES), (*BENZIMIDAZOLES, POLYMERS), TEMPERATURE, ACCEPTABILITY, FINISHES, SYNTHETIC FIBERS, PROCESSING, TAPES, TENSILE PROPERTIES, WEAVING.

Subject Categories : Textiles

Distribution Statement : APPROVED FOR PUBLIC RELEASE