Is polycaprolactone a non newtonian fluid? 

Polycaprolactone (PCL) exhibits characteristics that align with non-Newtonian fluid behavior under certain conditions, particularly when modified or in specific formulations. The synthesis of PCL using a commercial enzyme as a catalyst in a clean-technology process demonstrates its versatility and potential for modification in rheological properties . This adaptability is crucial for understanding its behavior under different conditions, which can lead to non-Newtonian characteristics. The study on the flow behavior of polystyrene solutions, which shares similarities with PCL in terms of polymer behavior in solutions, indicates that polymers can exhibit non-Newtonian behavior such as shear thinning and normal stress differences . This suggests that under certain conditions, PCL could exhibit similar non-Newtonian behaviors when in solution or when modified. Further evidence of PCL's potential non-Newtonian behavior comes from the exploration of its rheological properties when modified through reactive melt processing (REx). The modification led to an increase in viscosity and a shift from Newtonian to shear-thinning behavior, indicating that PCL can exhibit non-Newtonian characteristics when chemically modified . Additionally, the study on suspensions of solid particles in a viscoelastic polymer matrix, using PCL as the suspending fluid, demonstrates that the incorporation of particles can alter the rheological properties of the polymer solution, leading to an increase in both viscous and elastic moduli. This reinforces the concept that PCL, under certain conditions or formulations, can behave as a non-Newtonian fluid . In summary, while PCL in its pure form might not inherently exhibit non-Newtonian fluid behavior, modifications through chemical reactions, the addition of particles, or its behavior in solutions can induce non-Newtonian characteristics such as shear thinning and changes in viscosity .

Non-Newtonian fluids with a yield stress

Not addressed in the paper.

Analysis of Non-Newtonian Liquids Using a Microfluidic Capillary Viscometer

Not addressed in the paper.

Substantial Effect of Water on Radical Melt Crosslinking and Rheological Properties of Poly(ε-Caprolactone).

Yes, poly(ε-caprolactone) (PCL) exhibits non-Newtonian behavior, transitioning from viscous to solid-like melt behavior with increased crosslinking, as shown in the study.

Viscoelastic properties of suspensions of noncolloidal hard spheres in a molten polymer

Yes, polycaprolactone behaves as a viscoelastic fluid in suspensions with solid spheres, exhibiting non-Newtonian behavior due to its viscoelastic properties in the study.