Glass transition temperatures of some linear polymers containing phenyl side groups

The glass transition temperatures of a number of poly(vinyl phenyl ketones), poly‐(vinyl benzoates), and poly(phenyl acrylates) have been measured by a refractometric method. The effects exerted on T g by the nature and position of the ring substituents and by the different groups binding the pendant phenyl rings to the polyvinyl chain are discussed. The importance of knowledge of the side‐group motions in the glassy state for the interpretation of glass temperature data is emphasized.