Simultaneous rheology and cure kinetics dictate thermal post-curing of thermoset composite resins for material extrusion.

ABSTRACT: Thermoset composites are excellent candidates for material extrusion because they shear thin during extrusion but retain their shape once deposited via a yield stress. However, thermal post-curing is often required to solidify these materials, which can destabilize printed parts. Elevated temperatures can decrease the rheological properties responsible for stabilizing the printed structure before crosslinking solidifies the material. These properties, namely the storage modulus and yield stress, must therefore be characterized as a function of temperature and extent of reaction for various filler loadings. This work utilizes rheo-Raman spectroscopy to measure the storage modulus and dynamic yield stress as a function of temperature and conversion in epoxy-amine resins with fumed silica mas

SUBMITTER: Romberg SK 

PROVIDER: S-EPMC10327424 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature