Meaning
Scientific disciplines studying flow focus on how chemical reactions alter the mechanical properties of a liquid over time. Expertise in chemorheology is required to design manufacturing processes for thermosetting polymers. The study links the chemistry of the resin to the physics of the molding process.
Viscosity Transition
Liquid resins must maintain a low resistance to flow to saturate reinforcement fibers. Through the application of chemorheology a process engineer determines the length of time the resin remains workable. This data prevents the injection of material that has already begun to thicken.
Processing Window
Industrial efficiency relies on knowing exactly how long a mold can be filled. The findings of chemorheology show that increasing the temperature lowers the initial viscosity but shortens the time before the material gels. Balancing these two factors is the primary challenge in high-volume production.
Thermal Influence
Temperature serves as the primary driver for both the reaction rate and the ease of flow. In the field of chemorheology the relationship is mapped as a curve that shows the life of the resin at different heat levels. This mapping allows for the selection of an optimal ramp rate that ensures the part is fully saturated before it hardens.
Without this data the risk of dry spots and scrap parts increases significantly.
