科研之友
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摘要
High-pressure water penetration process in water-assisted injection molding (WAIM) was simulated, and filling behavior of polymer melt as well as elongational and shear fields were investigated and analyzed.The shear rate distribution in unpenetrated zone is similar to that in conventional injection molding, whereas the shear rate in penetrated zone is nearly zero.The high-pressure water results in a strong elongational effect on melt around the water front.In the whole water penetration process, the shear rate of the melt across the thickness is higher and increases in the flow direction in penetrated zone.The elongational rate of the melt near the water channel is the highest and decreases towards the mold wall.The melt filling in both constant speed and constant force compression modes during injection compression molded (ICM) was simulated.The shear rate and melt temperature near the mold wall increase in the flow direction under both compression modes.Applying constant force compression in the late stage of melt filling decreases the cavity pressure and shear rate.High performance and functionalized parts with hierarchical structure were prepared using the WAIM and ICM based on aforementioned rheological modeling and simulation.
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