THERMAL-BEHAVIOR OF EPOXY-RESINS

A series of epoxy resins has been analyzed by measuring their heat cap acities from 140 K up to decomposition using differential scanning cal orimetry. The data for the solids were compared to the vibrational hea t capacities computed using an approximate vibrational spectrum consis ting of skeletal heat capacities (based on a Tarasov analysis) and gro up vibrations (obtained from IR and Raman data). The heat capacities f or the liquid were used to construct an addition scheme for the molecu les with similar groups in their repeating unit. The glass transition and the melting transition are discussed by analyzing the fast-cooled and well crystallized samples.