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Fibers from Polyhexamethylene Terephthalamide

Part I : Fine Structure

Celanese Research Company, Summit, New Jersey 07901, U. S. A.

Polyhexamethylene terephthalamide (nylon 6-T), wet-spun from concentrated sulfuric acid, yields poorly or moderately oriented filaments, depending on the amount of stretch during spinning. Such fibers cannot properly be called amorphous, since they characteristically show a "line-lattice" or one-dimensional order along the chain direction. There appear to be several alternate ways in which the chains pack together laterally in the spun fibers, and hot-drawn fibers with full three- dimensional crystallinity exhibit polymorphism. The birefringence and certain features of the x-ray pattern correlate with tenacity in both spun and drawn fibers.

Key Words: Sulfuric acid/water system • nylon 6-T(TN) • polyhexamethylene terephthalamide. Monofilaments (unstretched) • monofilaments (stretched) • multifilaments. Formic acid • acids • solvents • temperature • time • concentration. X-ray patterns (flat-plate) • birefringence • tenacity • meridional differences • crystal tilting • tilting crystal configuration • lattice points (reciprocal) • layer line positions. X-ray technique • tensile testing.

Textile Research Journal, Vol. 40, No. 8, 677-682 (1970)
DOI: 10.1177/004051757004000801


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