Polymer Science: Secondary Interactions and Cohesive Energy

This lecture covers the structures of polymers in the condensed state, including the phases determined by chemical constitution and external parameters. It delves into the cohesive energy that prevents polymers from entering the gas phase easily. The molecular orbital energy diagrams for symmetric diatomic molecules are discussed, along with the formation of carbon-hydrogen and carbon-carbon bonds. The lecture also explores non-covalent interactions, such as Coulombic, hydrogen bonding, and van der Waals forces, which influence polymer conformations. The cohesive energy of polymers and the types of attractive non-covalent interactions are analyzed, shedding light on the molecular organization in the condensed state.