TEIJINCONEX
26Pages

This brochure reflects TEIJIN'S latest information, and is subject to revision as additional information accumulates. TEIJIN makes no guarantee of results and assumes, no obligation or liability whatsoever in connection with this brochure. Up-to-date information may be obtained from our TEIJINCONEX DEPARTMENT.

Aramid fibers are aromatic-polyamide of which the molecular structure are comprised of linked benzene rings and amide bonds in the polyamide category. The U.S. Federal Trade Commission (FTC) distinguished these fibers from conventional aliphatic polyamide fibers, i.e. nylon fibers, in 1974, collectively reffering to aromatic fibers as "aramids." In 1977, the ISO similarly included this name in its listing of synthetic fibers As is described in this technical guide, aramid fibers differ greatly from conventional fibers (nylon) in both their properties and applications. Aramid fibers are...

Polymers used for synthetic fibers have crystalline, non-crystalline, and intermediate regions. The shape, size, alignment, ratio, and other properties of these regions are believed to be major factors determining the specific properties of a fiber. Typical values used to quantify these factors include the crystallinity, orientation, crystal size, and X-ray photograph. Table 1 shows the typical characteristics of TEIJINCONEX®, polyester, and nylon microstructures. As shown in the table, TEIJINCONEX® offers crystallinity, degree of orientation, and other properties comparable to those of...

Cross-section and side views of TEIJINCONEX® fibers are shown in Fig. 4 TEIJINCONEX® is manufactured with a wet spinning method, resulting in a characteristic cross section and surface shape.

(1) Fiber properties Conventional inorganic fibers used as heat resistant materials have an extremely high modulus. This makes it difficult to use these fibers in ordinary clothing or in industrial textiles requiring good bending fatigue resistance, and results in extremely poor processability. TEIJINCONEX®, however, retains performance comparable to existing general-purpose synthetic fibers such as polyester and natural organic fibers as shown in Table 2. Besides, the temperature of TEIJINCONEX®'s heat resolution is much higher than other general-purpose fibers. Table 2 Properties of...

The staple fiber properties of TEIJINCONEX® are shown in Table 3. A high tenacity (HT) type with greatly improved tensile strength is also available. Table 3 Fiber properties of TEIJINCONEX® ^The above numeric values are our actually measured values.

(2) Stress-strain curve The stress-strain curves of TEIJINCONEX® fibers are shown in Fig. 5 As shown in this curve, the properties of regular TEIJINCONEX® are approximately equal to those of polyester. High tenacity (HT) TEIJINCONEX®, however, offers greatly improved strength and modulus. (3) Elastic recovery The elastic recovery of TEIJINCONEX® as compared with polyester and nylon is shown in Table 6. Both elongation recovery and work recovery characteristics are similar to those of polyester. Table 6 Elastic recovery TEIJINCONEX®, Polyester, Nylon 6 Tester: Instron type Sample length :...

(5) Abrasion resistance Creep is a value used to express the behavior of change with time in the deformation induced by applying a constant stress to the fiber. The creep curve of TEIJINCONEX® staple fiber (2.2dtex) is shown in Fig. 6. At room temperature (20°C), there is relatively little change in the creep curve due to loading up to 0.88cN/dtex. At low load levels (max.0.44cN/dtex), there is also virtually no change due to temperature up to a maximum temperature of 200°C. The rate of creep is higher in spun yarn than in the staple when compared at the same load because of residual...

(1) Moisture absorption curve The moisture absorption curves of TEIJINCONEX® and selected other fibers are shown in Fig. 7. The moisture content of TEIJINCONEX® is 5.2% under normal conditions (21°C, 65%RH), and 9.0% at 95% RH. These values are between those of cotton and nylon. TEIJINCONEX® has one of the highest moisture content of all synthetic fibers. (2) Rate of moisture absorption and desorption The rate of moisture absorption and desorption of TEIJINCONEX® (2.2dtex) are shown in Fig. 8. and 9, respectively.

(1) Beta ray resistance Irradiation with radioactive waves normally induces a drop in the elongation and strength of the fiber due to cross linking between the fiber molecules or breaking of the molecules. Aromatic polymers normally offer excellent radiation resistance. The strength retention of fibers with beta rays is shown in Fig. 10. As the curves indicate, TEIJINCONEX® offers better radiation resistance than the other fibers used for the comparison. (2) Gamma ray resistance TEIJINCONEX® offers extremely high gamma ray resistance as shown in Fig. 11. TEIJINCONEX® retains 90% of its...

Heat resistant fiber we offer show the following outstanding performance. (1) Fiber performance Outstanding retention of fiber properties at high temperatures. (2) Dimensional stability Outstanding dimentional stability at high temperatures. (3) Long-term heat resistance Retention of fiber properties even after long-term exposure to high temperatures. The followings are generally required in order to achieve the above properties: © High melting point and decomposition point (2) High glass transition point (D Low oxidation decomposition rate ® Flexible molecular structure to thermal...

The decomposition starting temperature of TEIJINCONEX® is estimated to be 400-430°C from the TGA curve. A peak believed to represent oxidation decomposition appears on the heat side at approximately 400°C on the DTA curve measured in air. In a nitrogen atmosphere, a heat absorption peak caused by fusion is confirmed at approximately 430°C. These findings demonstrate that TEIJINCONEX® does not melt at high temperatures and retains its fiber configulation, but begins to be carbonized at approximately 400°C. This compares favorably with polyester, for which a fusion heat absorption peak...