An aramid, or aromatic polyamide, is a polyamide whose repeating units contain aromatic rings; Kevlar is the best-known example. It matters because its strength comes from a combination of hydrogen bonding between chains and π-interactions between the stacked aromatic rings, giving fibres of exceptional strength used in body armour, cables and composites. The aromatic backbone makes an aramid far stronger and stiffer than an aliphatic polyamide such as nylon.

芳纶,即芳香族聚酰胺,是一类重复单元含有芳香环的聚酰胺;凯夫拉是最著名的例子。它之所以重要,是因为其强度来自链间氢键与堆叠芳香环之间 π 相互作用的结合,造就了用于防弹衣、缆索和复合材料的高强度纤维。芳香族主链使芳纶比尼龙等脂肪族聚酰胺强韧、刚硬得多。