Aramid Materials Research Articles

Influence of Fiber Characteristics and Manufacturing Process on the Structure and Properties of Aramid Paper

The influence of fiber characteristics and calendering on the structure and properties of aramid paper was investigated. Laboratory aramid handsheets were prepared, and the structure and properties of them were investigated by Field Emission Scanning Electron Microscopy (FESEM), Dynamic Mechanical Analysis (DMA), X-ray Diffractometer (XRD) and strength test. A comparison with commerical Nomex papers showed that overdrawn fibers with high initial modulus and film-like fibrids were helpful for improving the interface bonding and mechanical strength of aramid paper. Hot calendering improved the crystallinity, storage modulus and interface bonding of aramid materials, thereby greatly improving the mechanical strength of aramid paper.

Direct synthesis and melt‐drawing property of aramids by bulk polycondensation of isophthalic acid with m‐phenylenediamine and 3,4′‐oxydianiline

AbstractThe direct polycondensation of isophthalic acid with a mixture of 1,3‐phenylenediamine (m‐PDA) and 3,4′‐diaminodiphenyl ether (3,4′‐ODA) could be successfully performed in the bulk to afford the expected co‐aramids for the first time. The co‐aramids with low molecular weights and 3,4′‐ODA contents higher than 50 mol% display excellent thermoplasticity and melt‐drawing property. Indeed, several meters long filaments with 12 μm diameter could be produced. In addition, the environmentally friendly method for the preparation of aramid materials as well as the demonstration of their filament formation will open up the new possibility to prepare aramid fibers. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

Vibration damping tape

A tape adapted to absorb and/or regulate vibration preferably includes a multi-layer material that may include a first elastomeric layer of vibration absorbing material which is substantially free of voids therein. A second elastomeric layer includes an aramid material therein and is disposed on the first elastomeric layer. The amramid material distributes vibration to facilitate vibration dampening. A third elastomeric layer disposed on the second elastomeric layer.

Characterization of magnetic tapes and substrates

Ultra-thin advanced magnetic tape substrates are shown to have superior characteristics when compared to PET. In particular, PEN and ARAMID are viable alternatives to PET with elastic moduli that range from 4-5.4 GPa for PEN, and 10 GPa for ARAMID. Also, the ARAMID material is more isotropic than PET or PEN with a higher glass transition temperature of 277/spl deg/C. Thermal and hygroscopic expansion measurements show that PEN and ARAMID are typically superior to PET. Characteristics of two developmental materials (a polybenzoxazole and a polyimide) are also presented.

Effect of Material Properties on Tire Performance Characteristics—Part I. Tire Cords

Abstract The effect of modulus of tire cords in stabilizer and body plies on the performance of a radial automobile tire is discussed. Cord modulus was varied systematically by using polyester, rayon, and aramid materials. High speed, endurance, and plunger energy were not effected. Rolling resistance was higher with aramid cord than with polyester cord in the body ply, but there was no effect of cord material in stabilizer plies. Increase of cord modulus in the stabilizer ply, however, did produce significantly higher cornering coefficient. Wear resistance was also higher, especially under high severity test conditions.