CHEM 203 Lecture Notes - Lecture 18: Vinyl Chloride, Radical Initiator, Vinyl Group
Document Summary
Hazardous properties of peroxides and example of a commonly used radical initiator that is safer to use: azobisisobutyronitrile (aibn) Vinyl group, phenyl group: the alkyl groups originating from ethylene and benzene, respectively: Radical polymerization of particular olefins (ethylene, propene, styrene, vinyl chloride ; also described as vinyl monomers) induced by radical initiators, e. g. , by aibn (or peroxides): ethylene propene styrene vinyl chloride. The oxygen atoms in o2 share a double bond, but the molecule has 2 unpaired electrons: it is a diradical (strongly paramagnetic)! Reminder: vb theory cannot account for the diradical nature of o2, but mo theory does: Ability of oxygen to initiate various radical reactions, including the polymerization of particular olefins. Toxicity of o2 due to its ability to initiate radical processes in biological systems. Radical inhibitors (also described as antioxidants): molecules that react with / destroy radicals, thereby halting radical chain reactions. Phenols: compounds in which an oh group is connected to a benzene nucleus:
