Glass Transition and Crystallization of Chitosan Investigated by Broadband Dielectric Spectroscopy.

ABSTRACT: Chitosan films obtained by solution casting were investigated by broadband dielectric spectroscopy (BDS) to explore both their glass transition and the effects of thermal annealing on molecular dynamics, deriving from residual water content as well as from cold crystallization. Glass transition at low temperatures could be evidenced in as-produced as well as thermally annealed films, where non-Arrhenian dielectric relaxation processes, consistent with a structural (α) relaxation, could be detected. The process detected at low temperatures could reflect the dynamics of residual water slaved by the polymer matrix. Secondary (β) relaxations, along with a slow process ascribed to interfacial polarization at the amorphous/crystalline interfaces, were concurrently detected. In most cases, a furt

SUBMITTER: Labardi M 

PROVIDER: S-EPMC12567186 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature