Polycarbonate Diols (PCD) are used for a wide range of polyurethane-based coating formulations, providing an extreme durability and a high performance to the final polymer. ok
In mathematics, a reciprocity law is a generalization of the law of quadratic reciprocity. There are several different ways to express reciprocity laws.
Reciprocity is so strong that a person will feel obligated to return a favor regardless of whether they like the person who originally gave the favor and even if they did not want the favor, as was demonstrated in an experiment by Dennis Regan in 1971.