DALLA BETTA GROUP S.R.L.

ARAMIDE

Other Specialties

Aramid or Aramid fibers are polymer fibers with very high mechanical performance obtained by processing Aromatic Polyamides. Polyamides are a family of polymeric materials obtained by polycondensation of diamines and dicarboxylic acid; they can be characterized by a "linear" structure or contain aromatic groups. We speak of polyamides with a linear structure or chain when the bonds between the carbon atoms and the various functional groups develop mainly along a line, among the polyamides with a linear structure it is worth mentioning Nylon. Nylon, being characterized by a linear structure, is very deformable. In fact, it is characterized by an elastic modulus E of around 5 GPa and has a relatively low mechanical resistance to traction when compared to that of other polymeric materials; due to its poor rigidity and tenacity, Nylon is not used in the structural field. The presence of aromatic rings in the molecule of a polyamide leads to an increase in mechanical performance compared to that of linear polyamides, in particular, in the modulus of elasticity, if the content of aromatic rings is greater than 85 percent we speak of aromatic polyamides and, more properly, of ARAMIDES. Aramid fibers are characterized by a mechanical tensile strength comparable to that of the most common carbon fibers but by an elastic modulus that is on average lower. On the other hand, due to their lower specific weight (1.4 g/cm3 compared to 1.8 g/cm3 of carbon) aramid fibers are characterized by a higher specific resistance understood as mechanical tensile strength in relation to the specific weight of the material. The use of aramid fibers is, for the most part, indicated in the reinforcement of masonry structures where a high elastic modulus is not necessary and, often, can constitute a problem. They also stand out for having a high resistance to cutting and abrasion, good heat stability (it decomposes at about 500°C), it is a non-conductive material. In the presence of UV radiation, degradation phenomena are generated.

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