A composition comprising a fluid, and a material dispersed in the fluid,
the material made up of particles having a complex three dimensional
surface area such as a sharp blade-like surface, the particles having an
aspect ratio larger than 0.7 for promoting kinetic boundary layer mixing
in a non-linear-viscosity zone. The composition may further include an
additive dispersed in the fluid. The fluid may be a thermopolymer
material. A method of extruding the fluid includes feeding the fluid into
an extruder, feeding additives into the extruder, feeding a material into
the extruder, passing the material through a mixing zone in the extruder
to disperse the material within the fluid wherein the material migrates
to a boundary layer of the fluid to promote kinetic mixing of the
additives within the fluid, the kinetic mixing taking place in a
non-linear viscosity zone.