Construction of interfacial interlocking structure through elastic turbulence in multi-melt multi-injection molding(M3IM)
In this study,multi-melt multi injection molding(M31M)was employed to construct a hierarchical structure for an incompatible system of poly(vinylidene di fluoride)(PVDF)and high-density polyethylene(PE-LD),and their inter-facial properties were investigated.The results indicated that a unique interfacial interlocking structure was formed in these two incompatible polymers under the special external field of M3IM process,resulting in an increase in the peeling strength by 3.3 times.The experimental and numerical simulation analyses demonstrated that the formation of such an interfacial interlocking structure was attributed to an unstable flow generated at the breakthrough region when the second-ary melt was injected into the primary melt as well as the elastic turbulence of the polymer melt at low Reynolds num-bers.The Reynolds numbers in the thickness direction presented a bimodal distribution and tended to increase by more than one order of magnitude at the interface region.Compared to the regions before the breakthrough part,the turbulent kinetic energy and kinetic energy dissipation rate of the melt increased significantly after the breakthrough part.
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