2008/06/09 by S. Caponi, Silvia Caponi, S. Corezzi +11
Chemistry · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Soft Condensed Matter (cond-mat.soft) #Spectroscopy and Quantum Chemical Studies #Thermal and Kinetic Analysis #Various Chemistry Research Topics #cond-mat.soft
paper · pdf · doi:10.48550/arxiv.0806.1486
arxiv created 2008/06/09 · openalex publication_date 2008/06/09 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Raman scattering measurements are used to follow the modification of the vibrational density of states in a reactive epoxyamine mixture during isothermal polymerization. Combining with Brillouin light and inelastic x-ray scattering measurements, we analyze the variations of the boson peak and of the Debye level while the system passes from the uid to a glassy phase upon increasing the number of covalent bonds among the constituent molecules. We find that the shift and the intensity decrease of the boson peak are fully explained by the modification of the elastic medium throughout the reaction. Surprisingly, bond-induced modifications of the structure do not affect the relative excess of states over the Debye level.