Hilmar Backer, Sabic's transportation segment leader for resins in Europe, says the Ultem PEI had the strength and mechanical properties necessary for panel applications, which include overhead bins; and outperformed the polyaramid
core in flame, smoke, and toxicity standards; further, the laminate is thermoformable, which reduces production time and increases design flexibility.
Tight buffer is fiber optic cable made by encircling several pieces of fiber optic round the core and than it is covered with solid material such as polyaramid
and then it is wrapped with plastic mainly PVC which is resistant to heat.
The latter technique could be applied to the particular case of semicrystalline fibers such as polyaramid
fibers, where the 3D fiber orientation can be determined from pole figures (16).
The performance properties of PEN (polyethylene naphthalate) present opportunities for replacement of rayon or polyaramid
in carcass construction.
The first developments in highly oriented polymers were performed on fibres in the 1970s, in particular the polyaramid
The line spun by the spider is five times stronger than steel, and much tougher than polyaramid
Kevlar, the material used in bullet-proof vests and facial masks; it can absorb five times the impact force of Kevlar without breaking.
Sharply reduced vehicle weight (as much as 75 percent), thanks to bodies made from molded composites (car polyaramid
, for instance), rather than steel.
The fiber is then either woven with polyaramid
threads to add strength in protective garments or needlepunched and quilted into other fabrics to form an inner layer of fire protection in protective suits.
Liquid crystalline (LC) based polyaramid
and polyester fibers possess excellent tensile properties due to the high degree of molecular orientation imparted during the melt spinning process.
Box 50 CH-1218 Le Grand-Saconnex Geneva, Switzerland Telephone: 22-717-5111 Fax: 22-717-5109 Products: Polyester, Polyamide, Polyaramid
and Fluorocarbon Fibers for wet and dry laid nonwovens; Chemical Additives as Softeners, Plasticizers, Solvents, Emulsifiers, Adhesives, Binders, Repellants Plants: Maydown, Ireland; Uentrop, Germany Brand Names: Dacron, Kevlar, Nomex, Teflon, Avitex, Avitone, Zonyl, Merpol, Quilon, Tyzor, Ludox, Elvanol, Neoprene, Hypalon
These were rapidly followed by alloys with: polysiloxanes in 1961, PAES in 1965, PET in 1966, POM in 1968, PSF + ABS in 1969, PES in 1970, PBT in 1971, PA or PPE in 1973, PPS in 1974, PS in 1976, styrene-maleimide (SMI) in 1977, polyaramid
(PARA) in 1979, etc.
So, DMAc and HCl (produced during the polymerization reaction of diamine and diacid chloride) give the desired salt-solvent combination with increased solubility for polyaramids