Introduction
In the 1980's and 1990's a more advanced terpolyaramid was developed and put into production made from three monomers, two monomers forming PPTA which are the same as para-aramid.Khimvolokno Scientific – Production Association (now the All-Russian Scientific-Research Institute of Polymer Fibres) produced it and later T'ver (Tvervolokno now closed) produced Armos®. The main features of this fibre were long life time under the load (more than 15 years), high modulus and was produced without any sizing.
Chemical Structure
Armos® is an aromatic heterocyclic co-polyamide of principal chemical constitution:
Armos® is a random copolyamide of PPTA and PBI (CP-PTA/BI).
Properties
| Linear Density (Tex) | 29.4 - 1000 | |
| Density (g/cm3) | 1.42 – 1.45 | |
| Strength (cN/Tex) | 250 - 290 | |
| Strength (GPa) | Overall | 4.5 – 5.2 |
| Axial | 4.0 – 5.0 | |
| Across | 0.035 – 0.055 | |
| Elongation at Break (%) | 2.5 – 3.5 | |
| Modulus of Elasticity (GPa) | Overall | 145 - 160 |
| Axial | 100 - 110 | |
| Across | 4.0 – 6.0 | |
| Moisture Content (%) | 3.5 - 5.0 | |
| Ignition Temperature (℃) | 500 - 600 | |
| Self-Ignition Temperature (℃) | 550 - 650 | |
| Limiting Oxygen Index (%) | 39 - 42 | |
| Glass Transition Temperature (℃) | 220 - 240 | |
| Destruction Temperature (℃) | 450 - 550 | |
| Mean Diameter of Mono-fibers (μm) | 12 | |
Applications
- Strength of Armos® yarn is 20–50% higher than that of other aramid and related yarns and glass yarns is used as HM-HT fibre.
- It is used as fire-resistant material.
- It is used in radial tyres.
- As a composite in aerospace industry.
- As tyres of racing cars.
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