Aramids (such as Kevlar) are macromolecular compounds which can lead to desired materials for special properties such as heat resistance or tensile strength. Represent the hydrogen bond network connecting two Kevlar macromolecules (poly (p-phenylene terephthalamide)). -NH HN- -NH HN-

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Diol

In chemistry there are so many chemical compounds that have a hydroxyl group but a chemical compound having two hydroxyl groups (-OH) is termed as a diol. It also implies the presence of two alcohols whereas polyols contain two or more than two hydroxyl groups (-OH). Glycol or 1,2-diol is an aliphatic diol that has two alcohol groups on adjacent carbon atoms. In industries, the most commonly used diol is ethylene glycol.