MOLECULAR MODELING UREA-FORMALDEHYDE AND MELAMINE-FORMALDEHYDE RESINS.1. A FORCE-FIELD FOR UREA AND MELAMINE

A new methodology for the rapid and efficient derivation of a class II energy surface of a molecule has been demonstrated. It is shown that, where there is no existing adequate force field and insufficient expe rimental data from which to derive one, the method can be used to obta in a reliable representation of the energy surface. The resulting forc e field has been used to achieve the objective of interpreting the vib rational spectrum of melamine.