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Technical Paper

pCBT: A New Material for High Performance Composites in Automotive Applications1

2004-10-26
2004-01-2698
Cyclic oligomers of butylene terephthalate (CBT™)† represent a new chemical route to semi-crystalline thermoplastic polybutylene terephthalate (PBT). The oligomers of interest melt completely at about 150°C to produce a low viscosity fluid that is ideal for wetting and dispersing fibrous fillers and reinforcements thereby enabling the development of composites that were previously not possible when working with high viscosity commercial PBT. Introduction of catalyst to undiluted molten cyclic oligomer leads to rapid ring opening polymerization and the formation of high molecular weight thermoplastic PBT without the generation of volatile organic compounds. The polymer resulting from this polymerization will be hereby referred to as pCBT. Treatment of cyclic oligomers in this fashion results in pCBT thermoplastic resin with a high melting point (230°C) and physical performance similar to that of other commercially available PBT resins.
Standard

Yarn, Organic Fiber (Para-Aramid), High Modulus, 380 Denier,(420 d tex), 0.6% Finish

1991-10-01
HISTORICAL
AMS3901/2A
This specification covers one type of organic fiber in the form of yarn. The product shall be formed as a multiplicity of filaments drawn together and gathered into an approximately parallel arrangement. Organic 380 denier (420 d tex) yarn with 390 ksi (2689 MPa) or 22.0 g/d minimum tensile strength and 17.5 Msi (121 GPa) or 850 g/d minimum tensile modulus for use in general purpose composites requiring high tensile strength and high modulus of elasticity in tension.
Standard

Yarn, Organic Fiber (Para-Aramid), High Modulus, 2160 Denier, (2400 d tex), 0.6% Finish

1992-10-01
HISTORICAL
AMS3901/7A
This specification covers one type of organic fiber in the form of yarn. The product shall be formed as a multiplicity of filaments drawn together and gathered into an approximately parallel arrangement. Organic 2160 denier (2400 d tex) yarn with 390 ksi (2689 MPa) or 19.0 g/d minimum tensile strength and 16.5 Msi (114 GPa) or 750 g/d minimum tensile modulus for use in filament winding requiring high tensile strength and high modulus of elasticity in tension.
Standard

Yarn, Organic Fiber (Para-Aramid), High Modulus, 195 (215 d tex) Denier, 0.6% Finish

1991-10-01
HISTORICAL
AMS3901/1A
This specification covers one type of organic fiber in the form of yarn. The product shall be formed as a multiplicity of filaments drawn together and gathered into an approximately parallel arrangement. Organic 195 denier (215 d tex) yarn with 390 ksi (2689 MPa) or 19.0 g/d minimum tensile strength and 18 Msi (124 GPa) or 850 g/d minimum tensile modulus for use in general purpose composites requiring high tensile strength and high modulus of elasticity in tension.
Standard

Yarn, Organic Fiber (Para-Aramid), High Modulus, 1140 Denier, (1270d tex), 0.6% Finish

1991-10-01
HISTORICAL
AMS3901/3A
This specification covers one type of organic fiber in the form of yarn. The product shall be formed as a multiplicity of filaments drawn together and gathered into an approximately parallel arrangement. Organic 1140 denier (1270 d tex) yarn with 390 ksi (2689 MPa) or 22.0 g/d minimum tensile strength and 16.5 Msi (114 GPa) or 820 g/d minimum tensile modulus for use in general purpose composites requiring high tensile strength and high modulus of elasticity in tension.
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